## Elementary Algebra

$0.00000864$
To convert a number in scientific notation, $a \times 10^{n}$, to standard decimal form: (i) If $n$ is positive, move the decimal point $n$ places to the right; or (ii) If $n$ is negative, move the decimal point $|n|$ places to the left. The given scientific notation has $n=-6$. Thus, move the decimal point 6 places to the left to obtain: $(8.64)(10^{-6})=0.00000864$