Exponents represent the power to which a number is raised. Rules for exponents follow.

aⁿ = a * a * a * ... n times (a to the nth power)
a^maⁿ = a^m+n
a^m/aⁿ = a^m-n
(a^m)ⁿ = a^mn
a^-n = 1/aⁿ
a^1/n = nth root of a
a¹ = a
a⁰ = 1