Find f'(-2) if f(x) = x^4/5 - 7x. f'(-2) = ?
(Simplify your answer. Type an integer or a fraction.)

Consider circle c with angle acb measuring 3/4 radians.if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.

Collin did the work to see if 10 is a solution to the equation r/4=2.4

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.