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irina1246 [14]
2 years ago
14

HELP PLEASE! Please show work if possible!

Mathematics
2 answers:
Oksana_A [137]2 years ago
7 0
It’s b I did it on paper
Alex777 [14]2 years ago
7 0
The answer is b I just answered this question
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Step-by-step explanation:

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An arch for a bridge over a highway is in the form of a semiellipse. The top of the arch is 35 feet above ground (the major axis
jeka94

For given problem:

Put midpoint of ellipse, (0,0) at epicenter of bridge at ground level.

Specified length of vertical major axis = 70=2a

a=35

a^2=1225

 

Equation of ellipse:

 

x^2/b^2+y^2=1

 

plug in coordinates of given point on ellipse(25, 10)

 

25^2/b^2 + 10^2/a^2 = 1

 

625/b^2 + 100/1225=1

 

625/b^2 = 1 - 100/ 1225 = .918

 

b^2 = 625/.918 ≈ 681

 

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Span of bridge ≈ 52.16 ft

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3 years ago
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