Resposta :
Oie, tudo bom?
Resposta: b) x = 90.
[tex]f(x) = 5x - 160 \\⟶ \boxed{f(x) = 290} \\ 290 = 5x - 160 \\ - 5x = - 160 - 290 \\ - 5x = - 450 \: \: \: \: \: \: . \: ( - 1) \\ 5x = 450 \\ x = \frac{450}{5} \\ \boxed{x = 90}[/tex]
Att. NLE Top Shotta