Simplify(0.3 x 10 5 ) \(\div\) (0.4 \(\times\) 10 7 ), leaving you answer in
MATHEMATICS
WAEC 2007
Simplify(0.3 x 105) \(\div\) (0.4 \(\times\) 107), leaving you answer in the standard form.
- A. 7.5 x 10-4
- B. 7.5 x 10-3
- C. 7.5 x 10-2
- D. 7.5 x 10-1
Correct Answer: B. 7.5 x 10-3
Explanation
\(\frac{0.3 \times 10^5}{0.4 \times 10^7} = \frac{3 \times 10^{-1} \times 10^{5}}{4 \times 10^{-1} \times 10^7}\)
\(\frac{3 x 10^4}{4 x 10^4}\)
\(\frac{3}{4}\) x 104-6 = 0.75 x 10-2
= 7.5 x 10-3
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