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natka813 [3]
3 years ago
8

PLEASE HELP!!!!!!!! WILL MARK BRAINLIEST!!!! aLSO 99 POINTS!!!!!!!! If a train is scheduled to go 87 and 1 half miles in 2 and 1

half hours, what average speed must it travel? Answer Options with 5 options A. 37 and 1 fourth miles per hour B. 43 and 3 fourths miles per hour C. 35 miles per hour D. 25 miles per hour E. 2.5 miles per hour
Mathematics
2 answers:
stepladder [879]3 years ago
8 0
I think 35 sorry if im wrong good luck!!!!!
Roman55 [17]3 years ago
3 0
The answer is C. 35 mph

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Answer

Find out the length of the second parallel side.

To prove

Formula

Area\ of\ Trapezoid = \frac{(a + b)\times h}{2}

Where a , b are the parallel sides of trapezoid and h is the height of the trapezoid.

As given

The area of a trapezoid is 132 cm².

The height is 12cm and the length of one of the parallel sides is 9cm.

Here h = 12cm

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Put in the formula

132= \frac{(9 + b)\times 12}{2}

132 × 2 = 9 × 12 + 12b

264 = 108 + 12b

264 - 108 = 12b

156 = 12b

b = \frac{156}{12}

b = 13cm

Therefore the  length of the second parallel side is 13cm.

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Step-by-step explanation:

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