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Exponents and Powers | Exponents and Powers - Exercise

Question 7

\text { The reciprocal of }(2 / 5)^{-1} \text {is: }

(a) 2/5 (b) 5/2 (c) –5/2 (d) –2/5

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(b) 5/2

Explanation: By the law of exponent we know:

\mathrm{a}^{-\mathrm{n}}=1 / \mathrm{a}^{\mathrm{n}}

\text { Hence, }(2 / 5)^{-1}=1 /(2 / 5)=5 / 2

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subject-cta

Question 7

\text { The reciprocal of }(2 / 5)^{-1} \text {is: }

(a) 2/5 (b) 5/2 (c) –5/2 (d) –2/5

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

(b) 5/2

Explanation: By the law of exponent we know:

\mathrm{a}^{-\mathrm{n}}=1 / \mathrm{a}^{\mathrm{n}}

\text { Hence, }(2 / 5)^{-1}=1 /(2 / 5)=5 / 2

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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