Please help (15 points)

Solve the system of equations. y= 2x y= x^2 - 15

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length