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-BARSIC- [3]
2 years ago
11

A traffic helicopter descends to hover 477 meters above the ground. Let h be the original height of the helicopter. What is a su

btraction equation that represents the problem? What was the original height of the helicopter?
Mathematics
1 answer:
prisoha [69]2 years ago
6 0

The subtraction equation that represents the problem is ( h-477)metres

<h3>Subtraction problem</h3>

Given the following information

  • The original height of the helicopter = h meters

If the traffic helicopter descends to hover 477 meters above the ground, then the original height of the helicopter will be:

Original height = h - 477 (Since it is descending)

Hence the subtraction equation that represents the problem is ( h-477) meters

Learn more on subtraction problem here brainly.com/question/220101

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In a survey, the planning value for the population proportion is . How large a sample should be taken to provide a confidence in
tatuchka [14]

Answer:

n=350

Step-by-step explanation:

Notation and definitions

n random sample taken  (variable of interest)

\hat p=0.35 estimated proportion  (value assumed)

p true population proportion

Confidence =0.95 or 95% (value assumed)

Me=0.05 (value assumed)

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}})

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)  

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

n=\frac{0.35(1-0.35)}{(\frac{0.05}{1.96})^2}=349.586  

And rounded up we have that n=350

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3 years ago
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Answer:

m = ½

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Step-by-step explanation:

m = (-12 + 14)/(‐18 + 22)

m = ½

y + 14 = ½(x + 22)

y = ½x + 11 - 14

y = ½x - 3

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ivanzaharov [21]

Answer:

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Step-by-step explanation:

so you do you start with the left 2 to the third power is 8

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