exam Maths Puzzle Numerical Ability

The demand and supply equations for a certain item are given by D = -5p + 40 S = -p2 + 30p - 8Find the equilibrium price.
A) $1.57 B) $1.29 C) $1.71 D) $1.43

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exam Other Question

Determine whether sqrt(77) is rational or irrational Q. The diagonals AC and BD of quadrilateral ABCD are perpendicular to each other.
If P,Q,R,S are the midpoints of AB,BC,CD and DA, then prove quadrilateral PQRS