exam Maths Puzzle Numerical Ability

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!

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Find the slope of the line passing through the points (-8, -3) and (-2, 2).

Thanks! The plowed area of a field is a rectangle 80ft by 120ft. The owner plans to plow an extra strip of uniform width on each of the four sides of the field, in order to double the plow