exam Maths Puzzle Numerical Ability

Graph 2x-5y=10

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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. If f(x) = 7x^5 - 3, then f ^-1(x) =

a. [(x + 7)/5]1/3
b. [(x + 3)/5]1/7
c. [(x + 5)/7]1/3
d. [(x + 7)/3]1/5
e. [(x + 3)/7]1/5
f. [(x + 5)/3]1/7
g. none of these