exam Maths Puzzle Numerical Ability

The demand equation for a certain type of printer is given by D= -200p + 35,000
The supply equation is predicted to be S= -p^2+400p-20,000
Find the equilibrium price.

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exam Other Question
Solve and check each of the following equations for x.
x/ x - 2 - x + 1/ x = 8/ x^2 - 2x do you know the answer to y+(-3)=12 and can you show me how you got the answer