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Make r subject of the formula

V=πh²(r-(h/3))

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On a journey, a motorist travels the first 40 km in 1/2 hour, the next 34 km in 25 min and the last 7 km in 5 min. What is the average speed for whole journey?

Solve the question below and the workout

(7^81)/((7^56)x(7^25))

HELLO PEOPLE OF THE GROUP
HAVE A GOOD WEEK END

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simplify:
(4-5)-(13-18+2).

The fourth term of an A.P is 14 and the twelfth term is 70, find the first term and common difference.

2)If -3,x,y,12 are in AP, find x and y.

Using A.P formula:
Find the value of n given that 66is the nth term of the A.P 1,6,11,16,...