Simplify \((0.3\times 10^{5})\div (0.4\times 10^{7})\)leaving your answer in standard form
MATHEMATICS
WAEC 2007
Simplify \((0.3\times 10^{5})\div (0.4\times 10^{7})\)leaving your answer in standard form
- A. \(7.5\times 10^{-4}\)
- B. \(7.5\times 10^{-3}\)
- C. \(7.5\times 10^{-2}\)
- D. \(7.5\times 10^{-1}\)
Correct Answer: B. \(7.5\times 10^{-3}\)
Explanation
\((0.3\times 10^{5})\div (0.4\times 10^{7})\\
\frac{3}{10}\times 10^{5}\div \frac{4}{10}\times 10^{7}=3\times 10^{4}\div 4\times 10^{6}\\
\frac{3\times 10^{4}}{4\times 10^{7}}=\frac{3}{4}\times 10^{-2}=0.75\times 10^{-2}\\
7.5\times 10^{-3}\)
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *