20 points!!

Find the value of y when x=9.
y=1- 2x

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 acceleration of an object due to gravity is 32 feet per second squared. what is acceleration due to gravity in inches per second squared?