What is the successor of the natural number 2012?

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

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

The bolo cavern outside of vandalia is 421 ft below sea level. a little more than75 miles away. mt owens is 7295 feet above sea level. what is the difference in elevation between the bolo cavern and mt owens?