What is the quadratic regression equation that fits these data?
X
-4
-3
-2
-1
0
1
2
3
4
O A. ý = 0.82x2 + 0.78x+7.23
OB. 9=1642 +1.24x+8.08
O c. y = 2.13x² +0.13x+ 6.39
O D. = 16.76 1.02*
40
28
10
8
7
10
16
26
40

If they worked for k hours, the amount of work done would be [tex]\mathbf{ \dfrac{k(x+y)}{xy}}[/tex]hours.

Algebraic expression involves the use of variables and their arithmetic operations.

Given that:

If we have a function denoted by k (hours) indicating the work they both can do together. Then we can conclude that they can both work for:

[tex]\mathbf{=\dfrac{k}{x}+\dfrac{k}{y}}[/tex]

[tex]\mathbf{ \dfrac{k(x+y)}{xy}}[/tex]

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The percentage of the original sample that is left after 115 days is; 23.4733%

Formula for radioactive decay is;

A = A₀ * (1/2)^(t/t_¹/₂)

where;

A = quantity of the substance remaining

A₀ = initial quantity of the substance

t = time elapsed

t_¹/₂ = half life of the substance

Thus;

A/A₀ =  (1/2)^(115/55)

A/A₀ =  0.234733 or 23.4733%

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Step-by-step explanation:

ATTACHED IS THE SOLUTION.

Answer:

m<2=115

m=180-115

=75

your answer is 75 because house is hanged in 180

The number which could be added to both sides of the equation to complete the square is; -2.25.

The quadratic equations give in the task content is; 1=x²-3x. Hence, to express the equation by completing the square method; we have;

1 - 2.25 = (x -3/2)² - 2.25

Hence, the number which should be added to both sides of the equation is; -2.25.

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Answer:

0.98 miles

Step-by-step explanation:

Answer: y=7.5

Step-by-step explanation:

Given

y∝(1/√x)

this implies that

y=k/√x    eq(*)

when y=5 and x=36 then

5=k/√36

5=k/6

30=k        eq(1)

to find y when x is 16

put values in eq(*)

y=30/√16

y=30/4

y=7.5

Using proportions, it is found that the meaning of 1 + x is the percent of original price being paid.

A proportion is a fraction of a total amount, and the measures are related using a rule of three.

In this problem, the total cost of the toy is given by:

15.85(1 + x).

In which x is the sales tax.

We have that:

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An equation of the circle that will pass through the four (4) vertices of the square is (x + 2)² + y² = 2².

Mathematically, the general form of the equation of a circle is given by;

(x - h)² + (y - k)² = r²

Where:

Note: The center of a circle lies on the midpoint of the diagonal of a square, which is formed by joining its endpoints (opposite).

Midpoint on x-coordinate is given by:

Midpoint = (-2 - 2)/2

Midpoint = -4/2 = -2.

Midpoint on y-coordinate is given by:

Midpoint = (-2 + 2)/2

Midpoint = 0/2 = 0.

Thus, the center (h, k) = (-2, 0).

For the radius, we have:

r = √(-2)² + 0²

r = √4 = 2.

Substituting the parameters into the general equation, we have;

(x - (-2))² + (y - 0)² = 2²

(x + 2)² + y² = 2²

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a. The department that accounts for approximately one-fifth of the annual budget, based on the pie chart, is the Research Department.

b. The percentage of the annual budget used by the Marketing and Sales departments combined is 30%.

c. If 18% of the annual budget is used for Research, approximately the percentage used for Marketing is 9%.

A pie chart is a graphical representation of data in a circle.  In this pie chart, the area or percentage of the whole circle is 100%

Thus, we can obtain the values of the different groups represented in the pie chart by systematically dividing the circle accordingly.

The rule to follow is that vertical angles are always congruent (equal) as they have two lines that intersect to form opposite angles.

Research, Sales, and Marketing = 50% of the budget (half of the pie chart)

Research = 18%

Sales and Marketing = 32% (50% - 18%)

Research equals Media and Support and Media and Support are equal.

Therefore, Media is 9% (18%/2) and Support is also 9%.

Since opposite angles are always equal, Engineering (opposite to Sales and Marketing combined) is 32%.

This results in a total of 100% (18% + 32% + 9% + 9% +32%)

The pie chart attached shows how the annual budget for Equipment Producers Incorporated is divided by department. Use this chart to answer the questions below.

c) If 18% of the annual budget is used for Research, approximately what percentage is used for Marketing?

Thus, the department that accounts for approximately one-fifth of the annual budget, based on the pie chart, is the Research Department.

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The polygon formed was convex polygon.

A polygon that has at least one interior angle greater than 180 degree is called concave polygon . It usually has an irregular shape.

A convex polygon has all angles less than 180 degree.

It is given to follow some steps

1. A rectangular sheet of paper is taken .

2. It if folded and unfolded in random directions

3. Lines are drawn on the creases

4. The intersection points are marked A,B,C,D,E,F,G

5. The figure formed is a convex polygon as all the angles measure were less than 180 degree.

Therefore the polygon formed was convex polygon.

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By performing two experiments a lot of times, your brother will see that catching the coin mid-air does not affect the probability.

We assume that the probability of each outcome of the coin is equal, so the probability of getting tails is 0.5 and the probability of getting heads is 0.5

Then, you can say to your brother to perform his experiment a lot of times. In two ways.

First, he lets the coin came down to his hand around 100 times.

Then, he catches the coin in mid-air another 100 times.

He will see that the probability of getting heads (or tails) is (almost) the same in both cases, this will mean that his theory is false.

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Answer:

  7z^2/y -8z^4y -(9/2)z^2y^4

Step-by-step explanation:

The quotient of division of a polynomial by a monomial is the sum of quotients of each of the terms divided by the monomial. "Simplify" in this context generally means that no common factors remain factored out.

The rules of exponents apply:

  (a^b)/(a^c) = a^(b-c)

  a^-b = 1/a^b

The problem is effectively three (3) division/simplification problems.

  [tex]\dfrac{-14z^4y^2+16z^6y^4+9z^4y^7}{-2z^2y^3}=\dfrac{-14z^4y^2}{-2z^2y^3}+\dfrac{16z^6y^4}{-2z^2y^3}+\dfrac{9z^4y^7}{-2z^2y^3}\\\\=7z^{4-2}y^{2-3}-8z^{6-2}y^{4-3}-\dfrac{9}{2}z^{4-2}y^{7-3}=\boxed{\dfrac{7z^2}{y}-8z^4y-\dfrac{9}{2}z^2y^4}[/tex]

__

Additional comment

We have elected to retain the original order of variables (z then y) and the original order of terms. Ordinarily, standard form would have the variables in alphabetical order (y then z) and the terms in order by decreasing degree. This order of terms also makes the leading coefficient positive. (The minus sign for a negative leading coefficient sometimes gets lost.)

The function will go somewhere between x = 4 and x = 5

The function is given as:

y = 2^x

The question implies that:

If the maximum y value on a graph is x = 20; What is the maximum x value on the graph of y = 2^x

To do this, we start by setting y to 20.

So, we have:

2^x = 20

Take the logarithm of both sides

x log(2) = log(20)

Divide by log(2)

x = 4.32

4.32 is between 4 and 5

Hence, the function will go somewhere between x = 4 and x = 5

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Answer:

$4020.52

Step-by-step explanation:

The future value is the principal multiplied by the amount $1.00 is worth in the future.

$4,000 × 1.00513 = $4020.52

f(x) is a linear function that increases with x. represents the number of free nights earned as a function of x, the number of nights that you stay.

We know that f(x) represents the number of free nights earned as a function of x, the number of nights that you stay.

Such that:

f(x) = x/10.

Notice that, if x = 10, then:

[tex]f(10) = 10/10 = 1[/tex]

This means that if you stay for 10 nights, then you get a free night.

If you stay for 20 nights, then you win two free nights, and so on.

f(x) is a linear function that increases with x.

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Answer:

Step-by-step explanation:

The true statement is (A) A customer earns 1 free night per 10 nights stayed.

The function is given as:

From the above function, we can see that the number of nights (x) is divided by 10.

This means that, for every 10 nights stayed, the visitor gets one free night.

Hence, the true statement is (A) A customer earns 1 free night per 10 nights stayed.

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Answer:

D. c/6 - x

Step-by-step explanation:

Rearranging with subject '6y':

6y = c - 6x

Dividing the above equation by 6 to get subject 'y':

y = c/6 - x

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Extract the common factor 6.

[tex]\bf{6(x+y)=c }[/tex]

Divide both sides by 6.

[tex]\bf{x+y=\dfrac{c}{6} }[/tex]

Subtract x from both sides.

[tex]\bf{y=\dfrac{c}{6}-x \ \ \to \ \ \ Answer }[/tex]

Therefore, the correct option is "D".

Considering the given graph, it is found that f(-3) = 1.

First we identity x on the horizontal axis, then we look at the value of y on the vertical axis for which the function is marked at this point.

At this graph, when the horizontal axis is of -3, the vertical axis is of 1, hence f(-3) = 1.

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Answer:  9 eggs were left.

Step-by-step explanation:

A dozen eggs usually mean there are 12 eggs. We have two ways to solve the problems.

First way:

The egg used to make breakfast: 12 x 25% = 12 x 0.25 = 3

The eggs were left: 12 - 3 = 9

Second way:

12 x (1 - 0.25)

= 12 x 0.75

= 9

Answer:

a. f(0) = -6

b. f(2) =10

c. f(-4) = 32

d. f(b) = 3b^2+2b-6

e. f(4a) = 48a^2+8a-6

The function values for the function f(x) = 3x² + 2x - 6, for the values are:

a. f(0) = -6

b. f(2) = 10

c. f(-4) = 34

d. f(b) = 3b² + 2b - 6

e. f(4a) = 48a² + 8a - 6

To calculate function value f(k) for a function f(x), we substitute variable x = k, in the function f(x).

In the question, we are asked to find the function value for the function f(x) = 3x² + 2x - 6 for:

a. f(0)

b. f(2)

c. f(-4)

d. f(b)

e. f(4a).

We calculate these in the following ways:-

a. f(0):

We substitute the value of x = 0 in the function f(x).

Therefore f(0) = 3(0)² + 2(0) - 6,

or, f(0) = 0 + 0 - 6 = -6.

Therefore, the function value f(0) for the function f(x) = 3x² + 2x - 6 is -6.

b. f(2):

We substitute the value of x = 2 in the function f(x).

Therefore f(2) = 3(2)² + 2(2) - 6,

or, f(2) = 12 + 4 - 6 = 10.

Therefore, the function value f(2) for the function f(x) = 3x² + 2x - 6 is 10.

c. f(-4):

We substitute the value of x = -4 in the function f(x).

Therefore f(-4) = 3(-4)² + 2(-4) - 6,

or, f(-4) = 48 - 8 - 6 = 34.

Therefore, the function value f(-4) for the function f(x) = 3x² + 2x - 6 is 34.

d. f(b):

We substitute the value of x = b in the function f(x).

Therefore f(b) = 3(b)² + 2(b) - 6,

or, f(b) = 3b² + 2b - 6.

Therefore, the function value f(b) for the function f(x) = 3x² + 2x - 6 is 3b² + 2b - 6.

e. f(4a):

We substitute the value of x = 4a in the function f(x).

Therefore f(4a) = 3(4a)² + 2(4a) - 6,

or, f(0) = 48a² + 8a - 6.

Therefore, the function value f(0) for the function f(x) = 3x² + 2x - 6 is 48a² + 8a - 6.

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Applying partial fractions, the system of equations that can be used to find the values of A and B is given as follows:

The partial fraction is given as follows:

[tex]\frac{-15x + 10}{(5x - 2)^2} = \frac{A}{5x - 2} + \frac{B}{(5x - 2)^2}[/tex]

Applying the least common multiple at the right side, we have that:

[tex]\frac{-15x + 10}{(5x - 2)^2} = \frac{A(5x - 2) + B}{(5x - 2)^2}[/tex]

[tex]\frac{-15x + 10}{(5x - 2)^2} = \frac{5Ax - 2A + B}{(5x - 2)^2}[/tex]

Hence, comparing both sides of the equality:

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Answer:

The answer is Be

Step-by-step explanation:

5A=-15

-2A+B=10

Answer:

look below

Step-by-step explanation:

first way ,10 x 22 = 220

second way , 20 x 11 = 220

There are many ways other than this but I cant tell all of them.  for example, the person can just give Rs. 1000 to the shopkeeper and receive a change of Rs. 780

There are 12 ways he can pay this amount using the notes he has the answer is 12.

A permutation is the number of different ways a set can be organized; order matters in permutations, but not in combinations.

Let x be the number of Rs10 notes and y be the Rs20 note

10x + 20y = 220

The whole number of x and y which satisfy the above equation:

x = 0, y =11

x = 2, y =10

x = 4, y =9

x = 6, y =8

x = 8, y =7

x = 10, y =6

x = 12, y =5

x = 14, y =4

x = 16, y =3

x = 18, y =2

x = 20, y =1

x = 22, y =0

Total number of ways = 12

Thus, there are 12 ways he can pay this amount using the notes he has the answer is 12.

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Answer:

1/25

Step-by-step explanation:

The bag has:

The probability of picking a yellow marble is 2/10=1/5.

So, the answer is (1/5)² = 1/25

Answer:

$12.03

Step-by-step explanation:

I = prt

I = (875)(0.055)(3/12)

I = 12.03

Answer: $12.03

The required value of mean and variance is 203 and 3942 respectively.
Hence option B is correct.

The sample includes the following claims: 192, 113, 200, 287, and 225.

The statistic is the study of mathematics which deal with relations between comprehensive data.

Mean(x) = 192+113+200+287+225/5
x = 203

variance =[tex]\frac{\sum(x-x_i)^2}{n^2-1}[/tex]

=summation of squared value/n^2−1

=15769/25−1

=15769/24

=3942

Thus, the required value of mean and variance is 203 and 3942 respectively.

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Answer:

(2) / ((x + 5)(x - 1))

           &

(3x) / ((x - 6)(x - 1))

Step-by-step explanation:

The question is asking you to factor the denominator. In this case, you cannot simplify either of the numerators. You can factor the denominator by asking yourself the question: which two numbers multiply to equal the final number in the quadratic and add to equal the middle number in the quadratic?

1.) 2 / (x² + 4x - 5)

-----> Which two numbers multiply to -5 and add to 4? These numbers are 5 and -1. This makes the factors (x + 5) and (x - 1). The fully simplified answer: (2) / ((x + 5)(x - 1))

2.) 3x / (x² - 7x + 6)

------> Which two numbers multiply to 6 and add to -7? These numbers are -6 and -1. This makes the factors (x - 6) and (x - 1). The fully simplified answer: (3x) / ((x - 6)(x - 1))

*Please let me know if I misinterpreted the question or you need further clarification <3

The solution of the given inequality is:

x ≤ 15.24

We know that the maximum that she can spend on gasoline is the 12% of $400.

That is:

(12%/100%)*$400 = 0.12*$400 = $48

Now, we know that each gallon of gas costs $3.15, then if x is the number of gallons of gas that she buys, we have the inequality:

x*$3.15 ≤ $48

To solve the inequality, we need to divide both sides by $3.15

x ≤ $48/$3.15

x ≤ 15.24

So the maximum number of gallons of gasoline that she can buy is 15 gallons (actually a little more).

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Answer:

x < 1 or x > 1

Step-by-step explanation:

The domain of a function is the range of values of the input is real and defined

In this particular function, x = 1 is the only value at which the function is not defined since the denominator x -1 becomes 0 and the function is undefined since division by zero is undefined

Answer:

Shown in the attachment.

Step-by-step explanation:

Shown in the attachment.

3x² + 6x - 24

Simplify 3.

3(x² + 6x - 8)

Think of x² +2x−8. Factor the expression by grouping. First, we need to rewrite the expression as x² + ax + bx - 8. To find a and b, set up a system to be solved.

Since ab is negative, a and b have opposite signs. Since a+b is positive, the positive number has a greater absolute value than the negative. Show all pairs of integers whose product is −8.

Calculate the sum of each pair.

The solution is the pair that gives sum 2

Rewrite x² + 2x − 8 as (x² − 2x ) + (4x − 8).

Simplify x in the first group and 4 in the second.

Simplify the common term x−2 with the distributive property.

The entire factored expression is rewritten.

3 ( x − 2 )( x + 4 ) ===> Answer

We conclude that the correct option is "B".

Answer:

[tex]\frac{1}{6}[/tex]

Step-by-step explanation:

Given

ab = [tex]\frac{1}{4}[/tex]

bc = [tex]\frac{1}{3}[/tex]

ac = [tex]\frac{1}{3}[/tex]

We will use the first equation to find b in terms of a.

b = [tex]\frac{1}{4a}[/tex]

Now we will substitute b into 2nd equation to find c in terms of a.

[tex](\frac{1}{4a} )(c)=\frac{1}{3} \\\frac{c}{4a} =\frac{1}{3} \\3c = 4a\\c = \frac{4a}{3}[/tex]

Now we will substitute c into 3rd equation to find value a.

[tex]a(\frac{4a}{3} )=\frac{1}{3} \\\frac{4a^{2} }{3} =\frac{1}{3} \\4a^{2} =1\\a^{2} =\frac{1}{4} \\a=\sqrt{\frac{1}{4} } \\=\frac{1}{2}[/tex]

Now we will substitute a into first equation to find b.

b = [tex]\frac{1}{4(\frac{1}{2}) } \\=\frac{1}{2}[/tex]

Next we will substitute a into the 3rd equation to find c.

c = [tex]\frac{4(\frac{1}{2}) }{3} \\=\frac{2}{3}[/tex]

Now we got all 3 values, when we multiply them together,

a x b x c = [tex]\frac{1}{2} *\frac{1}{2} *\frac{2}{3} \\=\frac{2}{12} \\=\frac{1}{6}[/tex]