exam Maths Puzzle Numerical Ability

Solve for h
V=((Pi/3)(r^2)(h))
how do i solve for h
I don't know what to use for the Pi Symbol

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exam Other Question

The demand and supply equations for a certain item are given by
D = -5p + 40
S = -p2 + 30p - 8
Find the equilibrium price What is the future value of a 5 year annuity due that promises to pay you $300 each year? The rate of interest is 7 percent.