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Natalka [10]
3 years ago
8

Dante is standing at horizontal ground level with the base of the Empire State Building in New York City. The angle formed by th

e ground and the line segment from his position to the top of the building is 48.4°. The height of the Empire State Building is 1,472 feet. Find his distance from the Empire State Building to the nearest foot.
A. 7.65 ft
B. 1, 968 ft
C. 1,307 ft
D. 2, 217 ft

Mathematics
2 answers:
Goshia [24]3 years ago
6 0

Answer:

The correct answer is option C.

Step-by-step explanation:

Height of Empire State Building = 1,472 feet

Angle formed by the line segment from the point of ground on which Dante is positioned to the top of the building is  48.4°.

Distance of Dante from the Empire State Building =?

In the fig ,ΔABC

AB = 1,472 feet, BC = ? , θ= 48.4°

\tan\theta =\frac{Perpendicular}{base}

\tan 48.4^o=\frac{AB}{BC}

BC=\frac{AB}{\tan 48.4^o}=\frac{1,472 feet}{1.1263}=1,306.9 feet\approx 1,307 feet

Distance of Dante from the Empire State Building is 1,307 feet.

enot [183]3 years ago
4 0

Answer:

C. 1307 ft

Step-by-step explanation:

Given:

Angle = 48.4 degrees

Height, opposite side= 1472 feet

his distance from the Empire State Building, base=x

Now as per the trigonometric ratios:

Tan∅= Opposite/base

tan(48.4)= 1472/x

x=1472/(1.13)

x=1302.65

his distance from the Empire State Building is 1302.65 feet!

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Answer:

17.67-2.92\frac{2.517}{\sqrt{3}}=13.427    

17.67+2.92\frac{2.517}{\sqrt{3}}=21.913    

So on this case the 90% confidence interval would be given by (13.427;21.913)    

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.

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Solution to the problem

The confidence interval for the mean is given by the following formula:

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In order to calculate the mean and the sample deviation we can use the following formulas:  

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The mean calculated for this case is \bar X=17.67

The sample deviation calculated s=2.517

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

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Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,2)".And we see that t_{\alpha/2}=2.92

Now we have everything in order to replace into formula (1):

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17.67+2.92\frac{2.517}{\sqrt{3}}=21.913    

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