exam Maths Puzzle Numerical Ability

The demand and supply equations for a certain item are given by
D = -5p + 40
S = -p2 + 30p - 8
Find the equilibrium price

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exam Other Question

How do I find the slope and y intercept?

X+3Y=-9
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