Skills Handbook - Scientific Notation and Significant Digits - Exercises - Page 807: 20

$5.81×10^{−5}$

Rearrange Factors: $=(3.95\div6.8) \times (10^4 \div 10^8)$ Simplify: $\approx 0.58088 \times 10^{-4}$ Convert to scientific notation: $≈5.8088\times10^{-5}$ Round to the appropriate amount of significant digits: $≈\boxed{ 5.81 \times 10^{-5}}$