exam Maths Puzzle Numerical Ability

Simplify:

-5(-3 + 8)

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exam Other Question

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. Not sure how to do this.

One day, the temperature at 9:00 A.M. was 42°F, and by 2:00 P.M. the temperature was 57°F. What was the hourly rate of temperature change?


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