Question

Respondam
Por favor!
Deixando cálculo.

Answer 1

A)

$\cos( \beta ) = \frac{9}{x} \\ 0.6 = \frac{9}{x} \\ x = \frac{9}{0.6} \\ \boxed{x = 15}$

B)

$\cos( \alpha ) = \frac{x}{8} \\ \frac{4}{5} = \frac{x}{8} \\ x = \frac{32}{5} \\ \boxed{x = 6.4}$

C)

$\tan(a) = \frac{10}{x} \\ \frac{5}{12} = \frac{10}{x} \\ x = \frac{120}{5} \\ \boxed{x = 24}$