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1 year ago

If n = 5 what does (4n - 2)(7-n) equal?

Mathematics

1 answer:

nalin [4]1 year ago

6 0

Given

$(4n-2)(7-n)$

To evaluate this expression for n=5, the first step is to replace it with the given value for n.

$(4\cdot5-2)(7-5)$

Then you have to solve the operations inside both parentheses:

$\begin{gathered} (20-2)(2) \\ (18)(2) \end{gathered}$

Once solved the operation inside the parentheses terms, you can multiply the results

$18\cdot2=36$

This means that (4n-2)(7-n) equals 36 when n=5

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using the two variables linear equation x-2y=6. Find the missing coordinate (4, ). Then write the ordered pair for the solution.

neonofarm [45]

Answer:

72+40

Step-by-step explanation:

9(8+5) 8(9+5 8(9+7 5(8+9)

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3 years ago

Find an expression which represents the difference when (6x + 3) is subtracted

dalvyx [7]

Answer:

14x - 9x = 5x

Step-by-step explanation:

8x + 6 = 14x

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3 years ago

A machine produces a part for the automotive industry. 4% of the parts produced were defective in the past, and we believe that

Mamont248 [21]

Answer:

$n=\frac{0.04(1-0.04)}{(\frac{0.03}{1.64})^2}=114.76$

And rounded up we have that n=115

Step-by-step explanation:

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by:

$z_{\alpha/2}=-1.64, z_{1-\alpha/2}=1.64$

Solution to the problem

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

The proportion of defectives is estimated as: $\hat p=0.04$ . And on this case we have that the margin of error is $ME =\pm 0.03$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.04(1-0.04)}{(\frac{0.03}{1.64})^2}=114.76$

And rounded up we have that n=115

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3 years ago

PLZZZ HURRY!!<br> What is the series in summation notation?

dexar [7]

Answer:

A series can be represented in a compact form, called summation or sigma notation. The Greek capital letter, ∑ , is used to represent the sum. The series 4+8+12+16+20+24 can be expressed as 6∑n=14n . The expression is read as the sum of 4n as n goes from 1 to 6 .

Step-by-step explanation:

I hope it's help u