Question

alguem me ajuda, por favor?​

Answer 1

$\cos( \alpha ) = \frac{x}{x + 7}$

$\frac{5}{6} = \frac{x}{x + 7}$

$6x = 5x + 35$

$x = 35$

b)

$\tan( \alpha ) = \frac{x + 12}{3x}$

$\frac{2}{3} = \frac{x + 12}{3x}$

$6x = 3x + 36$

$3x = 36$

$x = 12$