### Home > GB8I > Chapter 4 Unit 5 > Lesson INT1: 4.2.1 > Problem4-61

4-61.

This problem is a checkpoint for laws of exponents and scientific notation. It will be referred to as Checkpoint 4.

Simplify each expression. In parts (e) through (f), write the final answer in scientific notation.

1. $4^2·4^5$

1. $(5^0)^3$

1. $x^{−5}·x^3$

1. $(x^{−1}·y^2)^3$

1. $(8\times10^5)·(1.6\times10^{−2})$

1. $\frac { 4 \times 10 ^ { 3 } } { 5 \times 10 ^ { 5 } }$