Question

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Answer 1

Answer:

9. Answer is (a)7

10. Answer is (b)1.05 x 10^9

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Answer 2

Answer:

Hope it helps you .

Step-by-step explanation:

$9. \: if \: (- \frac{ 2}{5} ) {}^{3x} = ( - \frac{2}{5} ) {}^{21} \: then \: x = (a)7$

$explanation \: -$

$\: ( - \frac{ 2}{5} ) {}^{3x} = ( - \frac{2}{5} ) {}^{21} \\ or \: 3x = 21 \\ or \: x = \frac{21}{3} \\ or \: x = 7$

10 . The standard from of 1050000000 is -

$(b) \: 1.05 \times 10 {}^{9}$