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.

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I cant figure this out

the number of students at westwood high school with a drivers license is 558. this is 24% more than last year. how many students had a drivers license last year.

THANKS Find the value of r so that the line through (-4,3) and (r, -3) has a slope of 2/3.