Which equation represents the function modeled in the graph?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

What expression is equivalent to log3(x+4)