Sarah started collecting coins last year. She already collected 58, when she received another 21 from her parents.

She is expecting to get 12 more for her birthday next week.

How many coins is she going to have at the end of next week if her expectation is right?

Find the sum of the following series. round to the nearest hundredth if necessary.

The diameter of a table is 5 feet. what is the circumference

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.