Answer:
56
Step-by-step explanation:
Since ABCD is a parallelogram, AB= DC
[tex]4y=(y+42)[/tex]
Simplifying the equation
[tex]3y=42[/tex]
Divide 3 on both sides, to get [tex]y[/tex]
[tex]y=14[/tex]
[tex]AB =4y = 4\times14[/tex]
[tex]=56[/tex]
