Are the ratios 5: 3 and 15: 12 equivalent ?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

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