Tolong jwab no 9 sma no 10 ya:)

EF = DExAB + AExCD / AD
EF = 3x13 + 7x3 / 7+3
EF = 39 + 21 / 10
EF = 60/10
EF = 6

CE/CB = DE/AB
6/6+y = 5/7
5(6+y) = 6x7
30 + 5y = 42
5y = 42-30
5y = 12
y = 12/5
y = 2,4 cm

maaf kalau salah ya semoga benar