WAEC 2019 · Paper 1 · Q2

Evaluate $(0.064)^{-\frac13}$ .

Worked solution (try it first)

$0.064 = \frac{64}{1000}$ , and its cube root is $\frac{4}{10} = 0.4$ .
The negative index means the reciprocal: $(0.064)^{-\frac13} = \frac{1}{0.4}$
$= \frac{10}{4}$ .
So the value is $\frac52$ , option A.