Chapter 4.1, Problem 1PE

a. A(n)_____________ is used to show repeated multiplication of the base.

b. for b $\ne$ 0, the expression $b^0$ is defined to be ____________.

c. For b $\ne$ 0, the expression $b^{-n}$ is defined as _____________.

d. a number expressed in the form $a\times {10}^n$ , where $1\le \left|a\right|<10$ and n is an integer is said to be written in ________________.