8. Ironman can fly at the constant rate of 2.682 kilometers per second. He leaves the Stark tower and flies to the Moon, which is 961,000 miles away, at the same speed. Approximately, how many hours after take-off does Iromman reach the Moon? ( 1 mile \( =1.6 \) kilometers). A. 1.43 B. 40 C. 100 D. 159

Simplify the expression without using a calculator. \( \log _{9} 9=\square \)

7. Исследуйте но чётность и нечетность функции а) \( \mathrm{y}=4 \mathrm{x}-2 \mathrm{x}^{3}+6 \mathrm{x}^{5} \quad \); б) \( f(x)=\frac{5}{x^{4}+4 x^{2}} \)

20. Vereinfache im Kopf. \( \begin{array}{lll}\text { a) }\left(5^{\frac{4}{5}}\right)^{\frac{5}{2}} & \text { b) }\left(36^{\frac{3}{4}}\right)^{\frac{2}{3}} & \text { c) }\left(49^{-\frac{6}{7}}\right)^{\frac{7}{12}}\end{array} \)

Using the change of base formula, express \( \log_{2}(8) \) in terms of common logarithm.

Simplify the expression without using a calculator. \( \ln e^{2}=\square \)