Derek's score on a test was 90 percent. he had 72 questions right. how many problems were on the test?

How can you decide witch operations to use to slice a two step equation

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse