Please help!

40.

For a parallelogram,  Angle  ABC   +  Angle DAB  =  180

So

64   + 4y  -  12  =  180       

52 + 4y  = 180     subtract 52 from both sides

4y  = 128  divide both sides by 4

y  = 32

Also..for a paralleogram

AE  = EC

3x  - 5  =  16

x  = 21

x  = 7