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2 years ago

Can someone just tell me which ones are correct and which ones are wrong?

Mathematics

1 answer:

lozanna [386]2 years ago

6 0

First row all correct second rows all wrong and the first on of third row is correct be the last two are incorrect

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Please help. Thank you. :)

adelina 88 [10]

Hello!

To find the lateral area you use the equation

$\pi r \sqrt{ h^{2} + r^{2} }$

You put in the values you know and you get 829.4

To find the surface area you use the equation

$\pi r(r+ \sqrt{ h^{2} + r^{2} }$

Put in the values you know and you get 1209.5

The answer is A

Hope this helps!

5 0

2 years ago

Ed is doing a survey of popular colors for cars for a school report. He decides to take a sample by sitting near a busy intersec

o-na [289]

Answer: There are 12 white and blue cars more than silver and red cars

Number of white cars: n1=25
Number of blue cars: n2=17
Number of white and blue cars: n3=n1+n2=25+17→n3=42

Number of silver cars: n4=21
Number of red cars: n5=9
Number of silver and red cars: n6=n4+n5=21+9→n6=30

How many more white and blue cars are there than silver and red cars?
n=?

n=n3-n6=42-30→n=12

Answer: There are 12 white and blue cars more than silver and red cars.

4 0

2 years ago

Read 2 more answers

The number of pedestrian fatalities in the United States declined approximately steadily from 4,795 fatalities in 2006 to 4165 f

murzikaleks [220]

Answer:

Average rate of change = 0.1313 or 13.13% (approx.)

Step-by-step explanation:

Given:

Pedestrian fatalities in 2006 = 4,795

Pedestrian fatalities in 2009 = 4,165

Find:

Average rate of change

Computation:

Average rate of change = [4,165-4,795] / 4,795

Average rate of change = [-630] / 4,795

Average rate of change = 0.1313 or 13.13% (approx.)

3 0

2 years ago

Need help 10. solve inequality.<img src="https://tex.z-dn.net/?f=12c%20%5Cleq%2072" id="TexFormula1" title="12c \leq 72" alt="12

Sphinxa [80]

Hey, here’s your answer :)

4 0

2 years ago

The Westbrook Pharmaceutical Company manufactures atorvastatin pills, designed to lower cholesterol levels. Listed below are the

Sloan [31]

Solution :

Given :

$\mu = 24$

n = 15

$\overline x = 24.89$

s = 0.5902

The hypothesis :

$H_0 : \mu = 25$

$H_a : \mu \neq 25$

This is a 2 tailed test.

The significance level is $95 \% \ ( \alpha =0.05)$

The test statistic :

$Z=\frac{\overline x - \mu}{\frac{\sigma}{\sqrt n}}$

$Z=\frac{24.89-25}{\frac{0.5902}{\sqrt 15}}$

= -0.72

The p value : The p value for Z = -0.72 is 0.4716

The critical value : the critical value at α = 0.05 is +1.96 to -1.96

The decision rule :

If $Z_{observed} > Z_{critical}$ or if $Z_{observed} < -Z_{critical}$ , then reject $H_0$ .

Also if p value is less than α, then reject $H_0$ .

The decision :

Since the Z falls in between +1.96 and -1.96, we fail to reject the $H_0$ . Also since p value is greater than α, we fail to reject $H_0$ .

The conclusion :

There is not sufficient evidence at the 95% significance level to warrant rejection of the claim that the pills come from a population in which the amount of the atorvastatin is equal to 25 mg.

Now calculating the mean and the standard deviation :

$\text{Mean} = \frac{\text{sum of observation}}{\text{total observations}}$