Question

(7.4)×(10 power of -8)
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Answer 1

$7.4 \times 10 {}^{ - 8}$

➪Convert the decimal into a fraction

$= \frac{37}{5} \times 10 {}^{ - 8}$

➪Express with a positive exponent using $a {}^{ - n} = \frac{1}{a {}^{n} }$

$= \frac{37}{5} \times \frac{1}{10 {}^{8} }$

➪Multiply the fractions

$= \frac{37}{5 \times 10 {}^{8} }$