exam Maths Puzzle Numerical Ability

The total profit (in dollars) for sales of x rowing machines is given by
P(x)=-0.2x^2+300x-200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?

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exam Other Question

Good Morning..Can someone please assist me..Thanks
SOLVE THE FOLLOWING SYSTEM OF LINEAR INEQUALITIES BY GRAPHING?
X-2Y>4
X<4 THESE EQUATIONS BOTH HAVE THE LINE UNDER THE GREATE
please solve this using quadratic equatin with factoring method


t^2 - t/4 + 1/5 = 0