3 years ago

Help please anyone pleaseeeeeeeee

Mathematics

1 answer:

Rainbow [258]3 years ago

4 0

The answer is D. The height gets very small

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if a rectangles height was 11.1 in tall and the width was 11.7 in wide what is the width if the height is reduced to 3.7 in

kkurt [141]

Your answer is (in my opinion): 11.7in wide.
Just becuse the hight changed it does NOT mean that the width changed.

5 0

3 years ago

Pls help I'd appreciate it

gayaneshka [121]

Answer:

(2x -5) + (x) + (2x - 3) = 32.

5x-8 = 32.

ii) 5x-8=32

5x= 32+8

5x = 40

x= 40/5

x = 8

iii) 2x -5

2 × 8 -5 = 11.

2x-3

2×8-3

16-3 = 13

x =8

sides of the triangle= 8, 11, 13.

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3 years ago

Natalie spends x dollars on each flower for her garden. Which expression shows the amount she will spend on 5 flowers? A.5x B. X

just olya [345]

A. 5x
Hopefully this helped

4 0

3 years ago

A pile of newspapers in Ms.

xz_007 [3.2K]

Answer:

102

Step-by-step explanation:

4times 7=28. 28times4=102

7 0

3 years ago

The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident th

Oksana_A [137]

Answer:

The minimum sample size that should be taken is 62.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken

This is n when $M = 1, \sigma = 4$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$1 = 1.96*\frac{4}{\sqrt{n}}$

$\sqrt{n} = 4*1.96$

$(\sqrt{n})^{2} = (4*1.96)^{2}$

$n = 61.5$

The minimum sample size that should be taken is 62.

8 0

3 years ago