Question

Please help

The engine displacement of an automobile is the volume through which the piston moves from high to low position. If an engine has n cylinders, the displacement is D =pi*(bore/2)^2 • stroke • n, where the bore is the diameter of the cylinder and stroke is the length of the piston's travel.

1 If bore = r/2 and stroke = h, simplify the expression, D, in terms of r and h for 8 cylinders.
2 If the bore is 4 inches, the stroke is 3.4 inches, and the engine has four cylinders, what is the displacement? Round your answer to the nearest tenth of a cubic inch.

Answer 1

Answer: so which one is it?

Explanation:

Answer 2

(4/2)^2*3.4*4
2^2*3.4*4
4*3.4*4
13.6*4
54.4

(4/2)^2*3.4*4
2^2*3.4*4
4*1.7*4
6.8*4
27.2

the answer is 54.4 or the answer is 27.2, i can't quite figure it out but those are my best guesses