Question

Ajudem please!!!!!!!!!!! exercicio valendo ponto

Answer 1

Faz pelo teorema de tales
  $\frac{8}{x}= \frac{10}{18} \\ 144=10x \\ x=14,4$

Answer 2

8/10 = x/(10+8)
8/10= x/18
10x = 18.8
10x = 144
x = 144/10
x = 14,4