Question

Помогииииииииииитееееееее

Answer 1

$AB=BC+12 \ AB+13=6BC=6(AB-12) \ AB+13=6AB-72 \ 5AB=85 \ AB=17$

$frac{1-4(1-x)}{3} = frac{7}{2} \ 2(1-4(1-x))=21 \ 2-8(1-x)=21 \ 2-8+8x=21 \ 8x=27 \ x=3.375$