Question on: WAEC Mathematics - 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
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Correct Option: B
(\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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