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bija089 [108]
2 years ago
7

PLEASE HELP ME!!!!!!! I’ll give 40 points

Mathematics
1 answer:
andrew-mc [135]2 years ago
3 0

Answer:

350

Step-by-step explanation:

7 x 10 to the 7th power is 70000000 and 2x 10 to the 5th power is 200000, if you divide them yo get 350.

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Manny runs 15 3/4 miles each week. Zander runs 5/6 as many miles each week as Manny.
Liula [17]

Answer:

Zander ran 13 1/8 miles

Step-by-step explanation:

Manny = M

Zander = Z

Z=M(5/6)

Z=15 3/4(5/6)

Z=13 1/8

8 0
3 years ago
Angles θ and Φ are supplementary, and theta equals 3pi/7 find the measure of theta
Ivenika [448]
Hello : 
Φ + <span>3π/7 = </span>π 
Φ =  π - 3π/7
Φ =4π/7 
7 0
3 years ago
heather surveyed people in the mall concerning their cookie preference . She found that 80% of the people favored chocolate chip
tankabanditka [31]
Hello!

You have to find what 20% of 1,000 is

You can do this by converting 20% into a decimal and multiplying

20% as a decimal is 0.20

1,000 * 0.20 = 200

The answer is 200

Hope this helps!
5 0
3 years ago
A picture frame has a perimeter of 100 cm. Its width is 4 cm less than twice its length. What is the width of the picture frame?
balu736 [363]
2l + 2w = 100
l + w = 50 . . . (1)
w = 2l - 4 . . . (2)
l + 2l - 4 = 50
3l - 4 = 50
3l = 50 + 4 = 54
l = 54/3 = 18
w = 2(18) - 4 = 36 - 4 = 32

Therefore, the width of the picture frame is 32 cm.
3 0
3 years ago
Read 2 more answers
A consumer group is interested in estimating the proportion of packages of ground beef sold at a particular store that have an a
snow_tiger [21]

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

Solution to the problem

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 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

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)  

And on this case we have that ME =\pm 0.05 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)  

We assume that the estimated proportion for this case is \hat p =0.5 since we don't have prior information.

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

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

6 0
3 years ago
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