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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exam Other Question

A garden is 20 M by 25 M. it is surrounded by a walk-way. the outside perimeter of the walkway is 114 M. What is the width of the walkway? Can someone please help me solve this equation: √x-2 = 6√x^3-26. I would really appreciate it and thank you very much for taking the time to help me.