exam Maths Puzzle Numerical Ability

Evaluate:
7
(8x + 10)dx
0
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Find the area bounded by the curves:
y = 16 - x2
y =

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exam Other Question

efficiency_total=gear_type_efficiency^(# of gears-1)=.9^(29)=4.7

I don't remember symbols such as _ or ^
This is not from a textbook.

Thanks I tried to solve this by using the following formulas.

75=d(miles)/t(hours) -> t= d/75

s(speed)= d/75 -> ???

100= 2d/t+t(2nd lap) -> t+t(2nd lap)=d/50

PLEASE HELP ME