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nalin [4]
3 years ago
7

A mountain climber ascended 3/4 of a kilometer in 1/12 of an hour. What was the mountain climber’s ascent rate in kilometers per

hour?
A) 3 kilometers per hour
B) 4 kilometers per hour
C) 9 kilometers per hour
D) 12 kilometers per hour
Mathematics
2 answers:
Lilit [14]3 years ago
8 0
3/4 divided by 1/12 = 9
Yanka [14]3 years ago
3 0
<span>A mountain climber ascended 3/4 of a kilometer in 1/12 of an hour. What was the mountain climber’s ascent rate in kilometers per hour? 

Correct Answer: C. 9 Kilometers per hour </span>
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You live near a bridge that goes over a river. The underneath side of the bridge is an arch that can be modeled with the functio
Troyanec [42]
<span>y= -0.000475x^2 + 0.851x

How high above is the river bridge (the top of the arch)?

You have to find the vertex of of the parabole: the y-coordinate is the highest point.

Remember that the x-coordinate of the vertex of a parabole is at - b / 2a.

That is  x = - 0.851 / [ 2(-0.000475) = 895.79

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How long is section of bridge above the arch?

The section of the brige is equal to the difference of the two roots

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=> x( - 0.000475x + 0.851) = 0

=> x = 0 and x = 0.851 / 0.000475 = 1791.58

Then the section is 1791.58 feet long.

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3 years ago
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