exam Maths Puzzle Numerical Ability

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

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exam Other Question

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 many integers from 1 to 1000 inclusive are multiples of 2 or multiples of 9?