I don't understand how to answer them

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

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.