Find the value of the variables​

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

How to determine whether two known pairs of points are on the same line.

The following graph shows the consumer price index (cpi) for a fictional country from 1970 to 1980? a.) 1976 - 1978b.) 1972 - 1974c.) 1974 - 1976d.) 1978 - 1980