exam Maths Puzzle Numerical Ability

HELP! I need assistance with this demand supply problem!
The demand and supply equations for a certain item are given by
D=-5p+40
S=-p^2+30p-8
Find the equilibrium price!
Thanks in advance!
ac

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exam Other Question

did i factor this right?
5x^2-4xy+5x-4y

5x^2-4xy+5x-4y
(5x^2*4xy+5x)-4y
5x^2+4xy+5x=(1+2x)(1+5x)
=(x+2x)^2
Find a common solution for each system of equations:


x=2y 8y=4x