Chapter 4 - Polynomials - Test: Chapter 4 - Page 300: 16

$0.00000005$

Since the exponent in the given expression, $ 5\times10^{-8} ,$ is negative $8$, then move the decimal point $8$ places to the left. Hence, the given expression is equivalent to \begin{array}{l}\require{cancel} 0.00000005 .\end{array}