This document defines indices and provides examples of exponents and bases. It lists terms like "a to the nth power" and "a raised to the exponent n" to describe indices. Several examples are given of numbers raised to positive and negative powers, including 102, (-4)3, 75, (-12)9, (-21)2, 10-2, (-4)-3, 132, (-12)3, and (-43)2. Exercises at the end ask the reader to write out expressions in exponent form.