## Intermediate Algebra (12th Edition)

$0.00000091$
Since the exponent of $10$ in the given expression, $9.1\times10^{-7} ,$ is negative $7$, then move the decimal point $7$ places to the left. Hence, in standard form, the given expression is equivalent to \begin{array}{l}\require{cancel} 0.00000091 .\end{array}