sarah work at a concession stand for 2 hours and erans 22.50$, but if she works for 4 hours she earns $45. what is the rate of change

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?