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Probability

What is the n...

Question

What is the number to be multiplied by $(- 7)^{- 1}$ so as to get $10^{- 1}$ as the product?

\frac{- 7}{10}

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\frac{7}{10}

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\frac{9}{10}

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\frac{- 3}{10}

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Solution

The correct option is A $\frac{- 7}{10}$
$x \times {(- 7)}^{- 1} = 10^{- 1}$
$x \times \frac{1}{- 7} = \frac{1}{10}$
$x = \frac{1}{10} \times - 7 = \frac{- 7}{10}$

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Similar questions

(1 \times 100) + (1 \times 10) + (1 \times 9) + (3 \times 10^{- 1}) + (6 \times 10^{- 2}) + (7 \times 10^{- 3})

Simplify the following:

(1) Subtract (−5) from 5.

(2) How much should be subtracted from (+5) to get −7?

(3) By how much (−10) exceeds (−20).

(4) From what number should (+10) be subtracted to get −15?

(5) What must be added to +7 to get −10?

(6) What should be added to +10 to get −4?

(7) If then, fill up the gap.

(8) If then fill up the gap.

(9) . Find the difference and show the operation by drawing a number line.

(10) Subtract −100 from the sum of −30 and +30.

By what number should $5^{- 1}$ be multiplied so that the product may be equal to $(- 7)^{- 1} ?$

By what number should ${(\frac{1}{2})}^{- 1}$ be multiplied so that the product many be equal to ${(\frac{- 4}{7})}^{- 1} ?$

(10)^{9} + 2 (11)^{1} (10)^{8} + 3 (11)^{2} (10)^{7} + . . . + 10 (11)^{9} = k (10)^{9}

k

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