Respuesta :

4.

Similar triangles by law of SAS (side-angle-side)

MC CN 12 10
——— = ——— = ——— = ———
BM NA y 6


Cross multiply: (6)(12) = (10)(y)
y = 7.2



5.

Similar triangles by law of SAS (again)



40 24
——— = ———
30 x

Cross multiply: (30)(24) = (40)(x)
x = 18