Question

Q.5.A. Solve the following: (6)

1.Evaluate:(-3)²

2.The reciprocal of 7² is______.

3.(–13)⁰=_____

4.(–1)¹⁰⁰×100-¹=____

5.Express 60000 in standard form.

6.Express 0.000021 in standard form​

Answer 1

Answer:

$1.\: \: ( { - 3})^{2} = 9$

$2. \: \: \frac{1}{49}$

$3. \: \: { - 13}^{0} = 1$

$4. \: \: { - 1}^{100} \times {100}^{ - 1} = 1 \times ( - 100) \\ = - 100$

$5. \: \: 6.0 \times {10}^{4}$

$6. \: \: 2.1 \times {10}^{ - 5}$

hope it will understood ❤️

Answer 2

• (-3)² = -3 × -3 = 9

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• 7² it can be written as 7 × 7 = 49 . So reciprocal of 49 = 1 / 49 .

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• (–13)⁰ = 1

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• (–1)¹⁰⁰×100-¹ = 1 × -100 = (-100)

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• 60000 = $\sf\:6 \times 10^{5}$

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• 0.000021 = $\sf\:2.1 \times 10^{-5}$

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