exam Maths Puzzle Numerical Ability

given the total revenue function R(x) = 1000x-x^2 and the total cost function C(x)=3000+20x, find the total profit function P(x) and the maximum profit.

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exam Other Question

A pizza parlor has a choice of 12 toppings for its pizzas. From these 12toppings, how many different 4-topping pizzas can be ordered? Assume that the order in which the toppings are listed does not matter.
Simplify:

-5(-3 + 8)