exam Maths Puzzle Numerical Ability

I cannot get anywhere with this problem, please help.

Find two consecutive positive integers such that the sum of their squares is 85.

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exam Other Question

Can you help me figure out what to do here? The problem is: (x+y)(2x-1)(x+1)
Thanks The demand and supply equations for a certain item are given by:

D = 5p + 40
S = -p^2 + 30p - 8

Find the equilibrium price..... How do I find the price when I am not sure of the actual numbers? Thank you!