exam Maths Puzzle Numerical Ability

The total profit (in dollars) for sales of x rowing machines is given by P(x) = 0.2 x^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

The sequence 2,3,5,6,7,10,... consists opf all natural numbers which are neither perfect squares nor perfect cubes. Find the 75th term of this sequence? I have to subtract as indicated and simplify the results if possible. Can someone show me how to do this?

6y/y^2-4 - 3/y+2

The 6y is over the y^2-4 and the 3 is over the y+2