A man distributes his savings of 4000 among his three sons in the ratio 4:3:3. Find the amount received by his first son.

Answers

Answer 1

Answer:

First son: 4

Second son: 3

Third son: 3

Sum ratio =10

First son= 4/10*4000=1600


Related Questions

This table represents a linear function?
X o 5
Y5 15
The greater unit of the two

Answers

The greater unit rate of the two functions is 2. The greater y-intercept of two functions is 6.

What is the unit rate?

Unit rate can be defined as the ratio between two measurements with the second term as 1. It is considered to be different from a rate, in which a certain number of units of the first quantity is compared to one unit of the second quantity.

From the given table, (0, 5) and (5, 15)

Here, slope(m)=(y2-y1)/(x2-x1) =(15-5)/(5-0)

= 10/5

= 2

Substitute m=2, (x, y)=(0, 5) in y=mx+c, we get

5=2(0)+c

c=5

Substitute m=2, c=5 in y=mx+c, we get

y=2x+5 --------(I)

From the graph, (-4, 0) and (0, 6)

Here, slope(m)=(6-0)/(0+4)

= 3/2

= 1.5

Substitute m=1.5, (x, y)=(0, 6) in y=mx+c, we get

6=1.5(0)+c

c=6

Substitute m=1.5, c=6 in y=mx+c, we get

y=1.5x+6 --------(II)

Therefore, the greater unit rate of the two functions is 2. The greater y-intercept of two functions is 6.

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what part of 72 is 36a

Answers

Answer: 2

Step-by-step explanation: hope it helps

To determine what part of 72 is 36a, we need to divide 72 by 36a. This will give us the ratio of 72 to 36a, which is equal to the part of 72 that is represented by 36a.

The result of this division is 72 / 36a = 2 / a. This means that 36a is equal to 2/a parts of 72.

For example, if a = 1, then 36a = 36, and 36 is equal to 2/1 parts of 72, or 2 parts. This means that 36 is equal to 2/1 * 72 = 144, which is equal to 2 parts of 72.

If a = 2, then 36a = 72, and 72 is equal to 2/2 parts of 72, or 1 part. This means that 72 is equal to 1 part of 72.

In general, the value of 36a will depend on the value of a. The value of 36a will be larger if a is smaller, and it will be smaller if a is larger.

Read the following prompt and type your response in the space provided.
Sarah has a $30 music gift card. Each day she uses it to buy a $1.99 song download. For how many days will the gift card have still have a balance of more than $18?

Write an inequality to solve the problem and then solve showing your work. Explain what the solution to the inequality means.

Question 8 options:

Answers

The inequality is:
18 > 30 - 1.99x
because >18 is the end balance (y value), 30 is the original balance/starting value (y-intercept), and -1.99 is the amount the balance changes (slope) per every song download/day (x).
To solve the inequality, first subtract 30 from both sides, to get:
-12 > -1.99x
Then divide both sides by -1.99, but since you’re dividing by a negative, make sure to switch the inequality sign as well. This results in:
~6 < x
That means the gift card will still have a balance of more than 18 for a little more than 6 days.
This might be wrong so sorry if it is… my math and logic seems to make sense tho

the number that comes up when a die, loaded so that one comes up twice as often as each of the other five sides, is rolled

Answers

When a die is loaded so that the probability of one side appears twice as often as the other five, the number "1" will be the most frequent result when the die is rolled.

When a die is loaded so that one side appears twice as often as the other five, the number that comes up most often when the die is rolled is "1". This is because the loaded die has an unequal probability of rolling each number, with one side being twice as likely to come up as any of the other five sides. This means that the chances of rolling this particular number are twice as great as the chances of rolling any of the other five numbers. For this reason, the number "1" will be the most frequent result when the die is rolled.The probability of rolling the number "1" is 2/7, while the probability of rolling any of the other five numbers is 1/7. Therefore, the number "1" is twice as likely to come up as any of the other five numbers when the die is rolled.

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Triangle Congruence: Question 1
In the accompanying proof, what is reason (5)?
Given: A B║DC
AB=DC
Prove: m ∠DAC= m ∠BCA
Select one:
SSS
SAS
SSA
ASA

Answers

In the accompanying proof, the reason (5) is SAS theorem.

In the given question,

Given: AB || DC

AB=DC

Prove: m∠DAC = m∠BCA

The statement used to prove this conditions are:

Statement                        Reason

AB || DC                            (1) Using the Quadrilateral Rule

AB=DC                             (2) Opposite sides are equal

m∠BAC = m∠DCA           (3) Alternate interior angles Theorem

AC=AC                              (4) Common Side

∆ADC≅∆CBA                   (5) SAS Theorem

m∠DAC = m∠BCA            (6) Alternate interior angles Theorem

We have to explain in the accompanying proof, what is reason (5).

So, in the accompanying proof, the reason (5) is SAS theorem.

In the proving we first prove one side equal, then angle equal and at last again one side equal.

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Algebra HELP PLS

The ceiling of Victoria's living room is a square that is 15√2 ft long on each side. To decorate for a party, she plans to hang crepe paper around the perimeter of the ceiling and then from each corner to the opposite corner. Victoria can buy rolls that each contain 30 ft of crepe paper. what is the minimum number of rolls she should buy?

pls show your work

Answers

Answer:

Minimum 5 rolls

---------------------------------------

Total length we need is the sum of the perimeter and two diagonals of the square.

Perimeter:

P = 4s P = 4(15√2) = 60√2 ≈ 85 ft (rounded up to the whole number)

Diagonals:

2d = 2s√2 = 2(15√2)(√2) = 30*2 = 60 ft

Total length:

85 + 60 = 145 ft

Number of rolls:

145/30 ≈ 5 (rounded up to the whole number)

When graphing the line y = x - 1. how do you
move from one point to another on the line?

A. 2 units up. 1 unit to the right
B. 2 units up. 1 unit to the left
C. 1 unit down. 2 units to the right
D. 1 unit up. 2 units to the right

Answers

Answer: C. 1 unit down. 2 units to the right

Step-by-step explanation:

Write a quadratic function with the given zero. 3 + i

Answers

Answer:

[tex]x^2 - 6x + 10[/tex] or in general: [tex]a(x^2 - 6x + 10)[/tex] where "a" is any constant real number except zero.  

Step-by-step explanation:

Complex Conjugate Root Theorem:

If we're given a complex root of a polynomial to be: [tex](a+bi)\text{ or }(a-bi)[/tex], then we know that its conjugate is also a root of the polynomial: [tex](a-bi)\text{ or }(a+bi)[/tex].

So since we're given the root: [tex](3+i)[/tex], then we know that its conjugate: [tex](3-i)[/tex] is also a root. Thus we have two roots so far.

Fundamental Theorem of Algebra:

The Fundamental Theorem of Algebra simply states that any polynomial, with degree "n", will have "n" roots, which can consist of both real and imaginary solutions.

So let's say I have a polynomial: [tex]x^6+3x+2=0[/tex], this has 6 roots, according to the Fundamental Theorem of Algebra, since the degree of the polynomial is 6 (remember the degree is simply the variable with the highest degree)

Since we already have two roots, and a quadratic function has a degree of two, we know that these are all the roots the quadratic has, since the Fundamental Theorem of Algebra states that a quadratic will only have 2 roots.

Factored Form:

We can generally express any polynomial in factored form, that is: [tex]a(x-b)(x-c)(x-d)...=y[/tex]

where "b", "c", and "d", and so on... are zeros of the function. This aligns with the behavior of zeros, since if we plug any of them into the function, then one of the factors will become zero, and since zero times anything is zero, well the entire thing is zero.

For example if I plug in "b", which is zero we get: [tex]a(b-b)(b-c)(b-d)...=y\implies a(0)(b-c)(b-d)=y\implies 0=y[/tex]

this is since plugging in zero, makes the factor: [tex]x-b[/tex] equal to zero, making the entire thing zero.

One last thing to mention is the "a" value in front which just generally determines the stretch/compression of the polynomial.

So with this information, we can write a polynomial:

[tex]a(x-(3+i))(x-(3-i))[/tex]

From here let's distribute the negative sign:

[tex]a(x-3-i)(x-3+i)[/tex]

Now this may look a bit tough to distribute, but you may notice a pattern here, we have a difference of squares. It may not be obvious, but if we make one substitution, let's say: [tex]u=x-3[/tex], then we get the equation

[tex]a(u-i)(u+i)[/tex]

The difference of squares is expressed as: [tex]a^2 - b^2 = (a-b)(a+b)[/tex], so our expression will expand out into:

[tex]a(u^2 - i^2)[/tex]

The substitution was just to make things a bit more clear, but let's just substitute x-3 back into the equation.

[tex]a((x-3)^2 - i^2)[/tex]

From here, we know that i^2 is simply -1, since: [tex]\sqrt{-1} = i, \text{ so }i^2 = -1[/tex]

We can also easily expand out the polynomial using FOIL

[tex]a((x^2 - 6x + 9) -(-1))\\a(x^2 - 6x + 9 + 1)\\a(x^2 - 6x + 10)[/tex]

You may notice the "a value, and that's just a constant, which determines the stretch/compression of the polynomial, and can be any real number, except for zero since that will make the entire thing zero regardless of what x is. For the sake of simplicity, let's just write this to be 1.

Tim is building a brick wall that will be 4 feet
high and 57 feet long. It takes 7 bricks to build
1 square foot of wall.
(Area = length x width)

Answers

The approximate number of bricks he will use for the entire building is; 1596 bricks

How to find the area of the building?

We are given that;

- Tim is building a brick wall that will be 4 feet high and 57 feet long.

- It takes 7 bricks to build 1 square foot of the wall.

The area of the building is gotten by applying the area of a rectangle which is;

Area of building = Length * Width

Thus;

Area = 4 * 57

Area = 228 square foot

Now, we are told that it takes 7 bricks to build one square foot of wall. Thus;

Number of bricks required here is;

N = 228 * 7

N = 1596 bricks

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The complete question is;

Tim is building a brick wall that will be 4 feet

high and 57 feet long. It takes 7 brick to build 1 square foot of wall

(Area = Length x Width)

Approximately how many bricks will he use for the entire building?

Select all the equations that have g=5 as the solution.
Select all that apply.
A. g-1=4
B. 34+g=50
C. g-1=15
D. g+5=15

Answers

A

5-1=4

34+5=39

5-1=4

5+5=10

Answer:

[tex]A)g-1=4\\g=4+1\\g=5[/tex]

Step-by-step explanation:

[tex]A)g-1=4\\g=4+1\\g=5\\\\B)34+g=50\\g=50-34\\g=16\\\\C)g-1=15\\g=15+1\\g=16\\\\\\D)g+5=15\\g=15-5\\g=10\\So the only Option remaining is A) which the correct answer[/tex]

givena triangle with side ollenghts of 5 and 8 which iniquality describes all possible lenghs of the thhird side

Answers

given a triangle with side of  lengths of 5 and 8 then c^2 =89 inequality describes all possible lengths of the third side

In the right triangle of sides a, b, and c

a^2 + b^2 = c^2

Since a = 5 and c = 8

Substitute them in the given rule

we get

25+64= c^2

89= c^2

Take a square root for both sides

c= sqrt 89

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Consider the equation a + b = c − d/2 when solved for each variable. Choose all that are correct.

A. d = 2a + 2b - 2c

B. b = 1/2(-2a + c - d)

C. c = a + b + d/2

D. a = 1/2(-2b + 2c - d)

Answers

The equations that are correct are a = 1/2(-2b + 2c -d) and c = a + b + d/2. The correct options are  C. c = a + b + d/2 and D. a = 1/2(-2b + 2c -d)

Solving equation

From the question, we are to solve the equation for each variable

The given equation is

a + b = c - d/2

Solving for a

a + b = c - d/2

a = -b + c -d/2

Multiply through by 2

2a = -2b + 2c -d

By multiplying both sides by 1/2, this can be written as

a = 1/2(-2b + 2c -d)

Solving for b

a + b = c - d/2

b = -a + c - d/2

Multiply through by 2

2b = -2a + 2c - d

By multiplying both sides by 1/2, this can be written as

b = 1/2(-2a + 2c - d)

Solving for c

a + b = c - d/2

a + b + d/2 = c

Therefore,

c = a + b + d/2

Solving for d

a + b = c - d/2

Multiply through by 2

2a + 2b = 2c - d

d = 2c  - 2a - 2b

d = -2a - 2b + 2c

Hence, a = 1/2(-2b + 2c -d) and c = a + b + d/2  are correct

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The weight of a small car when rounded to the nearest 2 decimal place is 1.24 tons. Find the greatest and least possible weight of the car in 3 decimal place before it is rounded to the nearest hundred. Explain how u arrived at ur answer

Answers

Answer:

Below

Step-by-step explanation:

1.235 <= Weight < 1.245    before rounding

Suppose that the length of a confidence interval is 0.06 when the sample size is 400. Determine how the sample size must change to decrease the length of the confidence interval to 0.03 (Use decimal notation. Give your answer as a whole number:) new sample size:

Answers

We use Z-Distribution for large sample sizes, The reduced sample size is 200.

What do you mean by probability distribution?

A mathematical function called a probability distribution explains the likelihood of many alternative values for a variable. Graphs or probability tables are frequently used to represent probability distributions.

What do you  mean by Z-distribution?

A unique type of normal distribution with a mean of 0 and a standard deviation of 1 is known as the standard normal distribution, or z-distribution.

confidence interval = 0.06

Sample size= 400

new interval of confidence = 0.03

new sample size = 400/0.06 * 0.03

=200

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Player First
Round Final
Round
Golfer 11 72 72
Golfer 12 72 70
Golfer 13 70 73
Golfer 14 70 77
Golfer 15 68 70
Golfer 16 68 66
Golfer 17 71 70
Golfer 18 70 68
Golfer 19 69 68
Golfer 20 67 71
Suppose you would like to determine if the mean score for the first round of a golf tournament event is significantly different than the mean score for the fourth and final round. Does the pressure of playing in the final round cause scores to go up? Or does the increased player concentration cause scores to come down?
(a) Use α = 0.10 to test for a statistically significantly difference between the population means for first- and fourth-round scores. State the null and alternative hypotheses. (Use μd = mean score first round − mean score fourth round.
Calculate the value of the test statistic. (Round your answer to three decimal places.)
Calculate the p-value. (Round your answer to four decimal places.)
p-value =
(b) What is the point estimate of the difference between the two population means? (Use mean score first round − mean score fourth round.)

Answers

The difference between the two population means is estimated at -1.05.

What is meant by Null Hypothesis?

Null Hypothesis: The null hypothesis is a typical statistical theory which suggests that no statistical relationship and significance exists in a set of given single observed variable, between two sets of observed data and measured phenomena.

The information presented here represents the golfers' first and final round scores.

a. α= 0.10 is the significance level.

The following hypothesis test can be created:

Hypothesis of nullity H₀ μₐ= 0

This suggests that the population means of the first round and final round are identical.

Alternative formulation: Hₐ μₐ≠0

This suggests that the population means of the first round and final round are different.

The test statistic is now:

t=(d-meanₐ)[tex]\sqrt{n}[/tex]/sₐ

Excel can be used to determine the test statistic.

This will result in: 0.10<P<0.20.

b. The 90% confidence level is the primary margin of error. This indicates that there is no discernible difference, and the result is -1.05.

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If angle EBC is congruent to angle ECB, then ? is congruent to ?​

Answers

By using the property of angle, it can be calculated that [tex]\angle EBA \cong \angle ECD[/tex]

What are angles?

Angles are a way of measuring the amount of turn between two lines or three or more planes. An angle is formed when two lines intersect or when two planes meet. It is measured in degrees, with a full circle being 360 degrees. The angle is measured in terms of the amount of turn between the two lines or planes. Angles are typically used to describe the orientation of objects in space, such as the corners of a triangle, the angle of a flight path, or the angle of the sun’s rays. Angles are also used to measure the size of an angle and the distance between two points. Angles are important in mathematics because they help to analyze the size and shape of objects, and also to help solve problems.

Here,

It is given that

[tex]\angle EBC \cong \angle ECB[/tex]

Now,

[tex]180-\angle EBC \cong 180-\angle ECB[/tex] [Angle on a straight line]

[tex]\angle EBA \cong \angle ECD[/tex]

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Find all relative extrema in the function h(x)=cos((2π/3)x) on the interval [0, 2]

Find all ABSOLUTE extrema in the function h(x)=cos((2π/3)x) on the interval [0, 2]


HELP!!!

Answers

a) The relative extrema of the function h(x)=cos((2π/3)x) on the interval [0, 2] are given as follows:

Local minimum: (1.5, -1).Local maximum: (0,1).

b) The absolute extremas of the function h(x)=cos((2π/3)x) on the interval [0, 2] are given as follows:

Minimum: (1.5, -1).Maximum: (0,1).

What are relative extrema and absolute extrema?

Relative extrema are all the turning points on the graph of a function, which are the points in which the derivative of the function is zero, hence the function behavior's may change from increasing to decreasing or vice versa.

From the graph given by the image at the end of the answer, the extremas of the function are given as follows:

Local maximum: (0,1), as the function changes from increasing to decreasing.Local minimum: (1.5, -1), as the function changes from decreasing to increasing.

These are also the absolute extremas, as there are only one minimum extrema and one maximum.

If there were multiple extremas, we would have that:

The absolute minimum is the local minimum with the lowest value of y.The absolute maximum is the local maximum with the highest value of y.

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Employee c is paid an hourly rate of 13.25 per hour and works 2,080 hours per year. The employee was just promoted and received a 15% raise. What is the new yearly salary

Answers

The new yearly salary will be $31,694.

What is mean by Percentage?

A number or ratio that can be expressed as a fraction of 100 or a relative value indicating hundredth part of any quantity is called percentage.

Given that;

Employee c is paid an hourly rate of 13.25 per hour and works 2,080 hours per year.

And, The employee was just promoted and received a 15% raise.

Now,

Since, Employee c is paid an hourly rate of 13.25 per hour and works 2,080 hours per year.

And, The employee was just promoted and received a 15% raise.

Hence, The salary for 13.25 hours = 13.25 × 2080

                                                     = $27,560

And, The employee was just promoted and received a 15% raise.

Hence, The new salary = $27,560 + 15% of 27,560

                                    = 27,560 + 4134

                                    = $31,694

Thus, The new salary = $31,694

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A greengrocer has sorted their apples into three
categories A weighs 12g, B weighs 16g and C
weighs 24g
A customer buys 1 apple A, 3 apples B and 1 apple
C
If A, B and C were to represent different isotopes of
apple what would be the relative abundance of
each type

Answers

We need to use the concept of Relative Abundance. Relative Abundance of A,B and C are 14.28,57.14 and 28.57% respectively.

What is Relative Abundance?

The percentage of an organism of a specific sort in relation to the overall number of organisms in the area is known as relative abundance. Relative species abundances frequently follow particular patterns, some of the most well-known and extensively researched patterns in macroecology. Over a large variety of biological ecosystems, relative species abundances exhibit relatively similar patterns. Most species are rare (represented by a single individual in a community sample), while only a small number of species are prolific, according to a histogram of the number of species represented by 1, 2, 3,..., n individuals.

(M1)(x) + (M2)(1-x) = M(E) is the formula for Relative Abundance.

Calculation

A weighs 12g, B weighs 16g and C weighs 24g.

A customer buys 1 apple A, 3 apples B and 1 apple

So assume A,B and C as different isotopes of apples.

Relative Abundance of A=12/84 ×100⇒14.28%

Relative Abundance of B=48/84 ×100⇒57.14%

Relative Abundance of C=24/84 ×100⇒28.57%

We need to use the concept of Relative Abundance. Relative Abundance of A,B and C are 14.28,57.14 and 28.57% respectively.

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Why is authoritarianism a coexistence problem?​

Answers

It can be said that authoritarianism has been a coexistence problem because it is based on domination and violates many norms and rights.

¿How does authoritarianism impact coexistence?

Without a doubt, authoritarianism has a negative impact on coexistence, because it focuses on many behaviors and thoughts that go against many values and good principles.

Let's keep in mind that authoritarianism is a type of behavior where an individual places his will above others, this undoubtedly generates a conflict in coexistence.

¡Hope this helped!

Authoritarianism :

Authoritarianism is a form of government characterized by strong central power and limited political freedoms.

It is a coexistence problem because it often leads to the suppression of individual rights, freedoms, and diversity of opinion.

In an authoritarian regime, the government exercises strict control over all aspects of society, including the media, education, and civil society organizations.

This can result in the suppression of dissenting voices and the persecution of those who express views that are critical of the government.

Stock Market Worksheet 1
You need to show your work in order to receive full credit.

Business Organization
1. James invests $10,000 in a partnership with 3 other people. One of those people also invested
$10,000 and the other two invested $90,000 each. What percent of the business does James
own?

Answers

James owns on owns only 5 percent of the business capital.

How to calculate percentage?

We should know that percentage deals with number of ratios as a fraction of 100

James = $10,000

One partner = $10,000

Other two partners = ($90,000+90,000)=$180,000

Total capital invested = $)10000+10000+90000+90000)

Total investment = $200,000

James proportion= [tex]\frac{10,000}{200,000} *\frac{100}{1}[/tex]

Simplifying this to have James percentage of investment as 5 percent

James =5%

In conclusion James has only 5% of the business investment

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592x43 using standard algorithm showing answers

Answers

Answer:

25,456

Step-by-step explanation:

   592                       2 x 3 = 6       9 x 3 = 27 (You put the 7 in the tens place)

x     43                     (And add 2 to the hundreds after multiplication)

______             5 x 3 = 15    15 + 2= 17    (So you add 1 to the thousand place)

   1776                                      Which would be 1776

2368

Now we do the same thing but with 4 this time, and we wont use the ones place because were putting the numbers in the tens place to start with since it's 40                        2 x 4 = 8 (Goes in tens place)

          9 x 4 = 36 (6 goes in hundreds place and 3 to thousands place)

5 x 4 = 20       (So 2 goes into the ten thousands place, and 3 to thousands place)

                                                     So it would be 2368

What is the y intercept of the equation y - 6 = -2(x + 5)

Answers

Answer:

Step-by-step explanation:

To find the y-intercept of the equation y - 6 = -2(x + 5), we can set x equal to 0, since the y-intercept is the point where the graph of the equation crosses the y-axis.

Substituting 0 for x, we get:

y - 6 = -2(0 + 5)

y - 6 = -2(5)

y - 6 = -10

y = -4

Therefore, the y-intercept of the equation y - 6 = -2(x + 5) is (0, -4). This means that the graph of the equation crosses the y-axis at the point (0, -4).

ASTU = AXYZ, #27 = 28°, m2U = (4x + y)²
#2X=130%, #2Y = (&r=6p)
The equations are -2-
and y
-[

Answers

Answer:

[tex]x=5, y=2[/tex]

Step-by-step explanation:

[tex]4x+y=22 \implies 24x+6y=132 \\ \\ 8x-6y=28 \\ \\ 32x=160 \\ \\ x=5 \\ \\ \implies 4(5)+y=22 \implies y=2[/tex]

Eileen takes a student loan of 10,000 with simple interest to pay back after 10 years. If the estimated payment is 22,000, what is the interest rate on this loan?

Answers

The interest rate on this loan will be 5%.

How to calculate the interest?

Given that Eileen takes a student loan of 10,000 with simple interest to pay back after 10 years. If the estimated payment is 22,000.

The interest on the loan will be:

= $22000 - $11000

= $11000

The interest rate on this loan will be:

Rate = Interest / Principal × Time

Rate = 11000 / (22000 × 10)

Rate = 11000 / 220000

Rate = 5%

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point(s) possible
K
Write the standard form of the equation and the general form of the equation of the circle of radius r and center (h,k).
Graph the circle.
r=√√3; (h,k) = (1,-5)


Write the equation for the circle in general form

Answers

The standard equation of a circle is [tex](x-1)^{2} + (y+5)^{2}= (\sqrt{3})^{2}[/tex]. The equation of the circle in general form is (x-1)² + (x-1)² = 3.

What is the standard equation of a circle?

Standard form of circle equation is (x – a)² + (y – b)² = r²

What is the general form of the equation of a circle?

General form of Equation of a Circle.

x² + y² + 2gx + 2fy + c = 0, for all values of g, f and c.

The equation of a circle is

(x-h)²+ (y-k)² = r²

So, it's given that radius,

r = √3

h=1 and k=-5

So, by substituting all values to the standard equation of a circle is :

[tex](x-1)^{2} + (y+5)^{2}= (\sqrt{3})^{2}[/tex]

The equation of the circle in the general form is written as :

(x-1)² + (x-1)² = 3

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Solve each equation by completing the square:
0.1²-0.6x+0.9=0
2x²-12x+18=0

Answers

Answer:

-3

3

Step-by-step explanation:

0.1x^2-0.6x+0.9=0

(1/10)(x^2+6x+9)=0

(1/10)(x+3)^2=0

x=-3

2x^2-12x+18=0

2(x^2-6x+9)=0

2(x-3)^2=0

x=3

The solution of the equation 0.1x²-0.6x+0.9=0 is -3 and 2x²-12x+18=0 is 3.

What is an equation?

An equation is an expression that shows the relationship between two or more numbers and variables.

We are given the system of equation as;

0.1x²-0.6x+0.9=0

2x²-12x+18=0

Solving by completing the square:

0.1x²-0.6x+0.9=0

(1/10)(x²+6x+9)=0

(1/10)(x+3)²=0

x=-3

2x²-12x+18=0

2(x²-6x+9)=0

2(x-3)²=0

x=3

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a teacher figures that final grades in the statistics department are distributed as: a, 25%; b, 25%; c, 40%; d, 5%; f, 5%. at the end of a randomly selected semester, the following number of grades were recorded. find only the test statistics to test the claim that the grade distribution for the department is different than expected. be sure to set up the equation. do not conduct the hypothesis testing. grade a b c d f number 42 36 60 8 14

Answers

5.25 option c is the test statistics for the given data.

Given,

The observed values;-

A: 36

B: 42

C: 60

D: 14

E: 8

Total =160

 To verify the following claim, a chi square test must be performed:

H0: The proportions for the final grades are the same.

H1: The final grade proportions varies from one another.

The level of significance assumed for this case is α = 0.01  

The statistic to check the hypothesis is given by:  

X² = ∑ⁿi = 1 (Oi - Ei)²/Ei

 

Now all that remains is to use the following formula to determine the predicted values, Ei = % × total

And the calculations are given by:  

EA = 0.25 × 160 = 40

EB = 0.25 × 160 = 40

EC = 0.4 × 160 = 64

ED = 0.05 × 160 = 8

EF = 0.05 × 160 = 8

 

Here, the statistics;-

X² = (36 - 40)²/40 + (42 - 40)²/40 + (60 - 64)²/64 + (14 - 8)²/8 + (8 -8)²/8

= 16/40 + 4/40 + 16/64 + 36/8 + 0/8

= 5.25

 Therefore,

The test statistics for the given data is option c 5.25

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Regional Rent-A-Car is interested in studying how weight of a vehicle is related to the fuel efficiency for
several of its rental vehicles.
A random sample of 13 vehicles from Regional Rent-A-Car yielded the data in the table.
Weight (in pounds)
2000
3123
3775
2287
4000
2485
2114
2433
2525
2889
3186
3258
3622
Fuel Efficiency (in miles per gallon)
32.7
22.8
18.6
26.1
18.4
26.2
33.1
28.3
26.2
22.5
20.9
21.3
18.1

Answers

Answer:

Step-by-step explanation:

SolutionFinal answers are given below.

Back-up Theory and Details of calculations follow at the end.

Part (a)

Estimate of the slope for the least-squares regression line = - 0.0073  Answer 1

InterpretationFor every increase of 1 pound in car’s weight, the fuel efficiency would reduce by 0.0073 mpg.  Answer 2

Part (b)

Correlation coefficient, r = - 0.9438  Answer 3

Interpretation An r-value of - 0.9438 indicates that there is a strong inverse linear relation between car’s weight and fuel efficiency.

Negative sign implies that as car’s weight increases, the fuel efficiency would come down.Answer 4

Part (c) The estimated regression equation is: Fuel efficiency = 45.4705 – 0.0073 x car’s weight. Substituting car’s weight = 2684 in the above equation, the estimated fuel efficiency = 25.83.So, residual = 24.5 – 25.84 = - 1.23.

Thus, Residual for a car weighing 2684 pounds and having an average fuel efficiency of 24.5 mpg= - 1.23 Answer 5

Part (d)

Substituting fuel efficiency = 20.2 in the above regression equation, the estimated car’s weight = 3461Estimate of the weight of a car whose fuel efficiency is 20.2 mpg = 3461 pounds Answer 6

Some teachers use a weighted mean to calculate grades. Each score is assigned a weight based on its importance. To find a weighted mean, multiply each Lab Repor score by its weight and add the results. For example, a student's final chemistry grade is based on four sources: 30% from lab reports, 10% from quizzes, 25% from the midterm exam, and 35% from the final exam. What is the student's weighted mean given the scores shown in the table? Lab reports:81 Quizzes: 94 Midterm Exam: 75 Final Exam: 85

The students weighted score is__

Answers

To find the student's weighted mean, you need to multiply each score by its weight and add the results. The weights are given as percentages, so you need to divide them by 100 to convert them to decimal form. The weights are:

Lab reports: 30% = 0.3
Quizzes: 10% = 0.1
Midterm exam: 25% = 0.25
Final exam: 35% = 0.35

Now, you can calculate the weighted mean by multiplying each score by its weight and adding the results:

Weighted mean = (0.3 * 81) + (0.1 * 94) + (0.25 * 75) + (0.35 * 85)
= 24.3 + 9.4 + 18.75 + 29.75
= 82.2

So, the student's weighted mean is 82.2.
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