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2 years ago

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In a photograph, a stadium measures 7 inches across by 2 inches high. If the actual stadium measures 1000 feet across, which equ

ation can be used to find x, the height of the stadium in feet?

1 answer:

Ivahew [28]2 years ago

7 0

Answer:

x/500 = 2/8.

Step-by-step explanation:

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7th grade math help me please:)

Rus_ich [418]

Answer:

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Step-by-step explanation:

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2 years ago

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Which pair of functions are inverse of each other ?

vazorg [7]

Answer:

$\sf B. \: f(x) = 5x - 9 \: and \; g(x)=\cfrac{x+9}{5}$

Step-by-step explanation:

f(x) = 5x - 9 and g(x) = x+9/5 are inverses of each other.

<u>________________</u>

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1 year ago

You recently sent out a survey to determine if the percentage of adults who use social media has changed from 66%, which was the

il63 [147K]

Answer:

The 98% confidence interval estimate of the proportion of adults who use social media is (0.56, 0.6034).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

Of the 2809 people who responded to survey, 1634 stated that they currently use social media.

This means that $n = 2809, \pi = \frac{1634}{2809} = 0.5817$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.5817 - 2.327\sqrt{\frac{0.5817*4183}{2809}} = 0.56$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.5817 + 2.327\sqrt{\frac{0.5817*4183}{2809}} = 0.6034$

The 98% confidence interval estimate of the proportion of adults who use social media is (0.56, 0.6034).

6 0

2 years ago

The school Library was building a new one-room addition. the architects drawing shown below uses the scale 1/8 in = 1ft

EastWind [94]

Answer:

the total are is 459

Step-by-step explanation:

3 3/16 divided by 1/8 = 25 1/2 or 25.5

2 1/4 divided by 1/8 = 18

so 18 x 25.5 = 459

hope this helps

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2 years ago

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Problem page a long distance runner starts at the beginning of a trail and runs at a rate of 6 miles per hour. one hour later, a

alukav5142 [94]

The thing you have to figure out about this is the distance for each person and the time it takes for the biker to meet the runner. The rates we are told. The formula is distance = rate times time. Let's do that for the runner first. His rate is 6 so the formula so far is d = 6t. Now let's work on the time. If the biker left an hour later than the runner, then the runner has been running an hour more than the biker. Therefore, the runner's time is t + 1. Hold off on the distance part til we do for the biker what we just did for the runner. The biker's rate is 14, and we already decided that his time is t. His equation is d = 14t. Now at the exact moment the biker meets the runner their distances are the same. So if the equation for the runner is d = 6t + 6 and the equation for the biker is d = 14t and their distances are the same, by the transitive property, their rates and times are the same as well, meaning we set them equal to each other and solve for t. 6t + 6 = 14t. 6 = 8t and t = 3/4. This means that it took 45 minutes for the biker to meet the runner.

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2 years ago