16) ($$\frac{1}{16}$$)$$^{\frac{x-9}{}}$$ = 4;

Решим уравнение ($$\frac{1}{16}$$)$$^{\frac{x-9}{}}$$ = 4.

$$\frac{1}{16}$$ = 4⁻²

4⁻² * $$^{\{\frac{x-9}{}}$$ = 4¹

-2 * $$\frac{x-9}{}$$ = 1

-2x + 18 = 1

-2x = 1 - 18

-2x = -17

x = -17 : (-2)

x = 8,5

Ответ: x = 8,5