I need help with this question
please help

Answer:

2

Step-by-step explanation:

First distribute the first x into the first parenthesis:  x (2x - 4) = (2x + 1) (x - 2)

x times 2x is [tex]2x^{2}[/tex] and x times -4 is -4x

This changes the equation to: [tex]2x^{2}[/tex]-4x = (2x + 1) (x - 2)

Now multiply the other parentheses: [tex]2x^{2}[/tex]-4x = (2x + 1) (x - 2)

Do this by using the Foil method (I attached a picture of the method if you don't know it)

First: (2x + 1) (x - 2)

Do 2x times x which = [tex]2x^{2}[/tex]

Then 2x times -2 which = -4x

Then 1 times x which = x

Lastly, 1 times -2 which = -2

The order you do this is the order that the foil method says.

Now the equation is:

[tex]2x^{2}[/tex]-4x =[tex]2x^{2}[/tex]-4x+x-2 (I just added all the numbers we just got)
Next cancel out the equal terms. To combine like terms you'd usually move the right [tex]2x^{2}[/tex]  over to the left one and subtract it. But since they are the same number, subtracting it would leave you with 0. So you can just get rid of both.

You can also do this with both -4x

This leaves you with:

0=x-2

Now you move the variable to the left

you also make it negative since it is going to the other side of the =

this leaves: -x=-2

You can't have a negative x so now you have to change the signs for both. Make them both positive.

Now you have x=2

so your answer is 2

Answer:

d: 7, 38/6, -1.2, -3 1/4, -19/2.

Step-by-step explanation:

First, divide the fractions to get decimals, this is an easier approach to compare all the numbers.

-19/2 = -9.5

-3 1/4 = 4 x -3 = -12 + 1 = -3.25

38/6= 6.3333 (terminal 3)

The greatest numbers for this list is 6.33, -3.25, and -9.5. The rest of the numbers include -1.2 and 7.

With the entire order, we observe which lists are descending, starting with a positive or a negative number.

1. order can be: 7, 6.33, -1.2, -3.25, and -9.5 or 7, 38/6, -1.2, -3 1/4, -19/2.

2. order commonly confused can be: -9.5, -3.25, -1.2, 6.33, and 7 or -19/2, -3 1/4, -1.2, 38/6, 7.

The only order showing this is d: 7, 38/6, -1.2, -3 1/4, -19/2.

The reason why its not the second order starting with -19/2 is because descending typically refers to a positive number going down to a negative number. However, both orders can be right. For the sake of this problem, the best option is d.

Answer:

Step-by-step explanation:

Let y be the altitude and x the distance the plane travels from the point of the 35600 ft altitude location (x=0 at that point)

y = 35600 - 3200x

It would be nice to use time instad of distance, but there is no speed of the plane give.  It's altitude is espressed only on the basis of miles traveled.  If the elevation change were given in feet per minute, or some other unit of time, we can write an equation with time as the x variable.

This equations says:

1)  the plane starts at 35,600 ft (since x = 0, the result is 35,600 feet).

2) it descends 2,300 ft for every mile traveled from x = 0.

The unit rate of change is 3200 feet/mile.

The graph is attached.

The formula for R(N) for the function f(x) = (5x)2 on [1, 5] in terms of N is R(N) = [tex]100+400\times\frac{(N+1)}{N^2}+\frac{800}{3}\times\frac{(N+1)(2N+1)}{N^3}[/tex] and area is 767(approx).

In the given question, we have to find a formula for R(N) for the function f(x) = (5x)^2 on [1, 5] in terms of N.

The given function is f(x) = (5x)^2 on [1, 5].

∆x = (5-1)/N

∆x = 4/N

X = 1+i∆x

X = 1+i4/N

f(x) = 25X^2

f(x) = 25(1+i4/N)^2

f(x) = 25(1+i8/N+16/N^2 i^{2})

R(N) = [tex]\sum_{i=1}^{N}f(X)\Delta x[/tex]

Now putting the value of f(x) and ∆x

R(N) = [tex]\sum_{i=1}^{N}\frac{4}{N}\left[25\left(1+\frac{8}{N}i+\frac{16}{N^2}i^{2}\right)\right][/tex]

R(N) = [tex]\frac{100}{N}\sum_{i=1}^{N}\left(1+\frac{8}{N}i+\frac{16}{N^2}i^{2}\right)[/tex]

R(N) = [tex]\frac{100}{N}\left(\sum_{i=1}^{N}1+\sum_{i=1}^{N}\frac{8}{N}i+\sum_{i=1}^{N}\frac{16}{N^2}i^{2}\right)[/tex]

R(N) = [tex]\frac{100}{N}\left(N+\frac{8}{N^2}\sum_{i=1}^{N}i+\frac{16}{N^3}\sum_{i=1}^{N}i^{2}\right)[/tex]

R(N) = [tex]\frac{100}{N}\left(N+\frac{8}{N^2}\frac{N(N+1)}{2}+\frac{16}{N^3}\frac{N(N+1)(2N+1)}{6}\right)[/tex]

R(N) = [tex]\frac{100}{N}\times N+\frac{100}{N}\times\frac{8}{N^2}\times\frac{N(N+1)}{2}+\frac{100}{N}\times\frac{16}{N^3}\times\frac{N(N+1)(2N+1)}{6}[/tex]

R(N) = [tex]100+400\times\frac{(N+1)}{N^2}+\frac{800}{3}\times\frac{(N+1)(2N+1)}{N^3}[/tex]

Now finding the area

[tex]\text{lim}_{N\rightarrow \infty}[/tex]R(N) = [tex]\text{lim}_{N\rightarrow \infty}\left[100+400\times\frac{(N+1)}{N^2}+\frac{800}{3}\times\frac{(N+1)(2N+1)}{N^3}\right][/tex]

[tex]\text{lim}_{N\rightarrow \infty}[/tex]R(N) = 100 + 400 + 800/3

[tex]\text{lim}_{N\rightarrow \infty}[/tex]R(N) = 766.67

[tex]\text{lim}_{N\rightarrow \infty}[/tex]R(N) = 767(approx)

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A sampling technique that is based on the cumulative effect of information that every additional item in the sample adds as it is inspected is called: sequential sampling.

What is sequential sampling?

Sequential sampling is a non-probability sampling strategy where the researcher selects one or more populations within a time frame, conducts his research, evaluates the findings, and then selects further populations as necessary.

An auditor develops a set of three groups of sampling units, where each successive group contains the same number of units to be sampled. The sampling plan is to continue to the next group of sampling units if the preceding group contains at least one deviation

Simple random sampling, systematic sampling, stratified sampling, and cluster sampling are examples of probability sampling techniques.

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risk involved with the investment. Higher potential returns often come with a higher level of risk, as the investor is taking on the possibility of losing some or all of their investment in exchange for the chance to earn a higher return. It's important for investors to carefully consider the level of risk they are comfortable with and to do their due diligence before making any investment decisions. This may include researching the company or investment, reviewing financial statements, and consulting with financial professionals. Investors should also consider the potential tax implications of any investment, as well as how it fits into their overall financial plan.

Answer: D

Step-by-step explanation:

The exact answer is 2.571281591, which is between:

D) 2 and 3

Viktor is in the 60th percentile, which is 85, while the percentile for 71 is 26.666.

Percentile is defined as the value below which a given percentage falls under. Ben, for instance, is the fourth tallest child in a group of 20, and eighty percent of the kids are shorter than you. As a result, Ben is in the 80th percentile.

We have the data

Sort the data as follows: 58, 64, 66, 70, 71, 75, 77, 80, 84, 85, 87, 90, 93, 95, 96

employing the percentile formula,

Percentile is calculated as follows: 71 Percentile

(4 / 15)*100 Percentile

26.666 Percentile = (Number of Values Below "x" / Total Number of Values) 100

Consequently, 71's percentile is equal to 26.666.

Identifying the rank

Thus, the ranking is 0.6.

To find the rank for viktor

Find the percentile using the formula,

Percentile = Rank × Total number of the data set

Percentile = 0.6 × 15

Percentile = 9

Now, counting 9 values from left to right we reach 85, and we can say that all the values below 85 will come under the 60th percentile. In other words, 60% of the values are below 85.

The 60th percentile is 85

Thus viktor is in 60th percentile is 85

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Step-by-step explanation:

10.

-2 < 6x - 2 < 46

0 < 6x < 48

0 < x < 8

so the line goes (with empty dots because of "<") from 0 to 8.

11.

4 + 9r <= 58 or 7r - 3 >= 46

9r <= 54 or 7r >= 49

r <= 6 or r >= 7

the line goes (with filled dots because of ">=" and "<=") from 6 all the way to the left, and from 7 all the way to the right.

12.

filled dot at -4, empty dot at +3.

connecting line between both dots.

-4 <= x < 3

13.

filled dots at -1 and at +6.

lines going away left and right.

x <= -1 or x >= 6

14.

empty dots at +3 and +4.

lines going away left and right.

x < 3 or x > 4

15.

filled dot at +6, empty dot at +8.

connecting line between both dots.

6 <= x < 8

Answer: I could be wrong, but I tried my best.

Slope: 1/2

Y-intercept: (0, 6)

Step-by-step explanation:

Answer:

The answer is 15 workers are needed to complete the work in 16 days.

Step-by-step explanation:
To this incomplete sentence. ill try to answer it

The probability that you flip 'heads' and roll a number less than 5 is 1/3.

The probability of flipping heads is 1/2, and the probability of rolling a number less than 5 is 4/6.

The probability of both occurring is the product of the two probabilities, or 1/2 multiplied by 4/6, which is equal to 1/3.

This means that the probability of flipping heads and rolling a number less than 5 is 1/3.

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Answer:

2x-3>1

Step-by-step explanation:

lets say x is the interger

so twice an interger would be 2*x or 2x

and three less than 2x would be 2x-3

and 2x-3 is greater than 1

so 2x-3>1

Answer:

y-intercept: (0,4)

y-intercept in the coordinate form: (0,4)

The equation in slope-intercept form: y=7x+4

Step-by-step explanation:

The slope is rise/run

We see that the y increase by 28 and the x increase by 4, so the slope is 28/4 = 7

m = 7

We know that the y-intercept is at (0,4)

So the slope-intercept equation will be

y = 7x + 4

Answer:

y- intercept = 0.4

y- intercept in the coordinate = 0.4

so the equation is : y=7x+4

Probability that any one of three outcomes will occur: P(A, B, C), plus P(A, B, C'), plus P(A, B', C);

What is the probability that 3 people have different birthdays?

Since there are 363 days still “unused” out of 365, we have p = 363÷365 = about 0.9945. Multiply that by the 0.9973 for two people and you have about 0.9918, the probability that three randomly selected people will have different birthdays.

Poisson Way. The probability of same-birthdays triplet is 1 / (365 * 365), which is very small, and there are C(n, 3) triplets, which is a big number for the moderately high values of n (~>20).

Calculating the likelihood of three events

Probability that at least one of the three events occurs: Probability that each of the three occurrences will occur: P(A, B, C);

Probability that any one of three outcomes will occur: P(A, B, C), plus P(A, B, C'), plus P(A, B', C);

P() is the likelihood that none of the events will occur.

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Answer:

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

According triangle inequality theorem the sum of any two sides of a triangle is greater than the third side.

Apply this to our options, add up the two shortest sides and compare with the longest side.

Answer:

Step-by-step explanation:

You want values of p, q, r and s such that (2x + 3) (px^3 +qx^2 +rx +s) ≡ 2x^4 +13x^3 +7x^2 +18.

Multiplying out the left side of the equation, we have ...

  2px^4 +(3p+2q)x^3 +(2r +3q)x^2 +(2s +3r)x +3s

When we match coefficients between the two polynomials, this gives rise to 5 equations in the four unknown values:

The first and last equations tell us ...

  p = 2/2 = 1

  s = 18/3 = 6

Using these values in the 2nd and 4th equations makes them be ...

  3 +2q = 13   ⇒   q = 10/2 = 5

  12 +3r = 0   ⇒   r = -12/3 = -4

The values of p, q, r, s are ...

__

Check

We can use the 3rd equation to check these results:

  2r +3q = 7

  2(-4) +3(5) = 7

  -8 +15 = 7 . . . . . . . true

The range of the middle 50% of the data of scores on the assessment is 10.

Option A is the correct answer.

The range is the difference between the highest value and the lowest value of a given set of data.

We have,

Median = 80

First quartile = 70

Third quartile = 90

The Middle 50% is from the Median to the First quartile.

Range.

= 80 - 70

= 10

Thus,

The range is 10.

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The probability that detector B goes off is 0.75

In this question we have been given the security system in a house has two units that set off an alarm when motion is detected.

Here, the probability that detector A will not go off is 0.35

And the probability that A will go off and B will not go off is 0.25

We need to find the probability that B goes off

The probability that detector A will go off would be,

1 - P( detector A will not go off )

= 1 - 0.35

= 0.65

And the probability that both A and B will go off would be,

= P(A will go off) - P( A will go off and B will not go)

= 0.65 - 0.25

= 0.40

Now we find the required probability.

P(B goes off) = P(both A and B will go off) + P(detector A will not go off)

                     = 0.40 + 0.35

                     = 0.75

Therefore, the required probability is 0.75

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The domain and range of the function shown on the graph are (a) Domain is x ≥ 0, and range is y ≥ 0

From the question, we have the following parameters that can be used in our computation:

The graph

On the graph, we can see that the line is a straight line

This means that the graph is a linear function

However, the function only covers the positive axes

This means that

Domain is x ≥ 0, and range is y ≥ 0

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Answer:

croissants: 10        pain au chocolat: 12

Step-by-step explanation:

85c + 95p = 2000

c + p = 22

85c + 95p = 2000    

                               -

85c + 85p = 1870

         10p = 120

           p = 12

c + p = 22

c + 12 = 22

c = 10

Answer:

Step-by-step explanation: Let C be the number of croissants and P be the number of pain au chocolat that Didier buys. We know that C + P = 22 and 0.85C + 0.95P = 20.

We can solve this system of equations using substitution. First, we solve the first equation for P: P = 22 - C. Then, we substitute this expression for P into the second equation: 0.85C + 0.95(22 - C) = 20. Expanding the expression inside the parentheses and combining like terms, we get: 0.85C + 21.1 - 0.95C = 20.

Then, we can solve for C by moving all the terms to one side of the equation: -0.1C = -1.1. Dividing both sides by -0.1, we get: C = 11.

Substituting this value for C back into the equation P = 22 - C, we get: P = 22 - 11 = 11.

Therefore, Didier buys 11 croissants and 11 pain au chocolat.

Between $80,000 and $85,000, there is an outlier. Means are not immune to outliers, but medians are.

How do you define medians?

The middle number in a sorted series of numbers is referred to as the median in mathematics. Ordering the numerals reveals the center one. In descending sequence, the numbers are listed. The middle number, when the numbers are arranged, is referred to as the data set's median.

Why is median significant?

A useful way to determine where a dataset is in the middle is to use the median. You may gain a sense of a dataset's distribution by comparing both median and mean. The dataset is almost uniformly scattered from the mean if both mean and median are equal.

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The information required for ΔTUX to be congruent with ΔDEO by Hl is the corresponding legs of the right triangle. i.e. option a. TX ≅ DO

Two triangles are said to be congruent if all three corresponding sides are equal and all the three corresponding angles are equal.

Congruent triangles are triangles that have the same size and shape.

Therefore, ΔTUX is congruent to ΔDEO.

Triangle can be congruent base of HL(hypotenuse and leg).

Two right triangles are congruent if the hypotenuse and one corresponding leg are equal in both triangles.

Therefore, the additional information needed to prove ΔTUX ≅ ΔDEO by HL is TX ≅ DO.

TX and DO are the corresponding legs which are suppose to be equal.

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Answer:

A(1,2), B(-1,7) C(-4,8)

Step-by-step explanation:

I think that is the answer.

The polynomial p(x) = x³ + 8 · x² + x - 42 contains the zeros - 7, 2 and - 3.

Polynomials are algebraic expressions, whose standard form is shown below:

p(x) = Σ cₙ · xⁿ, for n = {0, 1, 2, 3, ..., m}

Where:

And whose factor form is:

p(x) = a · Π (x - rₙ), for n = {1, 2, 3, ..., m}

Where:

In this problem we need to find a polynomial whose zeros are only real and represented by r₁ = - 7, r₂ = 2 and r₃ = - 3, respectively. If we know that a = 1, r₁ = - 7, r₂ = 2 and r₃ = - 3, then the factor form of the polynomial is:

p(x) = 1 · (x + 7) · (x - 2) · (x + 3)

p(x) = (x + 7) · (x - 2) · (x + 3)

p(x) = (x + 7) · (x² + x - 6)

p(x) = x³ + x² - 6 · x + 7 · x² + 7 · x - 42

p(x) = x³ + 8 · x² + x - 42

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The slope of the line as per the given points will be equal to 7/10.

It is possible to determine a line's direction and steepness by looking at its slope.

Finding the slope between lines inside a coordinate plane can aid in anticipating if the lines are perpendicular, parallel, or none at all without physically using a compass.

As per the given information in the question,

The given points are (25, 24) and (15, 17)

Use the formula to find the slope,

m = (y₂ - y₁)/(x₂ - x₁)

Substitute the values in the above formula,

m = (17 - 24)/(15 - 25)

m = -7/-10

m = 7/10

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Answer:

[D] $ 24,250

Step-by-step explanation:

$24,250 dollar will I have after three years.

The minimum number would you need to survey sample Size N = 752.

A population proportion is the percentage of a population that falls into a specific category. Population proportions are estimated using confidence intervals.

Given,

A margin of error of 0.03

Z = 1.645 at a 90% confidence level

We use P=0.5 because there is no prior information about the population proportion.

To find the minimum number of subjects n= (Z*/M.E.)2 x P (1-P)

Solving by entering the given values into a formula: -

n = (1.645/0.03)2 × 0.5(1-0.5)

n = 3006.70 X 0.25

n= 751.67

Sample Size N = 752

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Answer:

a) The cost of buying x bottles of water is represented by the equation v = 0.50x, where v is the cost in dollars and x is the number of bottles of water. The gradient of this equation, which is 0.50, represents the cost per bottle of water.

b) The total cost of buying one bottle of water per day for a year (365 days) is 365 * 0.50 = $182.50.

c) If a refillable water bottle costs $40, then a person would have to drink 40 / 0.50 = 80 bottles of water in order for the refillable water bottle to be more cost effective.

d) Some factors that might influence someone's decision to carry their own water bottle or to buy bottled water include convenience, availability of clean drinking water, personal preference, and environmental impact.