Find f(-1)
f(x) = (1/5)^x

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

How many verticies does a triangular prims have

What is the sum of these mixed numbers 4 2/3+ 3 1/9