If the function f(x)=mx+b has an inverse function which statement must be true

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

It takes an ant farm 3 days to consume 1/2 of an apple. at that rate, in how many days will the ant farm consume 3 apples

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.