What is the value of n in the equation 0=18+128n^2?

How do you determine whether a relationship represented as as graph is linear or nonlinear

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.

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14