Question

Решие пожалуйста 4, 5 и 7!!

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Answer 1

4.

$S=\frac{\pi R^{2} }{360} *\alpha$

S = $\frac{3 * 5^{2} }{360} * 60= \frac{3*25}{360} *60$ = $\frac{75}{6} = 12,5$

Ответ: 12,5

5.

$\sqrt{2^{4}* 3^{6} } = 2^{2} * 3^{3} = 4 * 27 = 108$

7.

$log_{7} (4x+7) = 2; x> -\frac{7}{4}\\ 4x +7=7^{2} \\4x+7=49\\4x=49-7\\4x=42\\x=\frac{21}{2} = 10\frac{1}{2} = 10,5$