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20 questions · self-marked practice — reveal the answer and mark yourself.

Question 121 Mark
$\left(\frac{2}{3}\right)^{-2}=$ _______. $\left(\frac{9}{4}, \frac{4}{9}, \frac{3}{2}\right)$
Answer
$\frac{9}{4}$
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Question 171 Mark
Very small numbers can be expressed in standard form using  _______ exponents.(positive, negative, decimal)
Answer
negative
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