What is the difference quotient for the function f(x)=-(1/(5x-12))?

2-digit numbers less than 91 which are 1 less than a multiple of 10

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.

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x