use the fact that A and B are supplementary ...
A + B = 180
B = A + 30
finish up
no
adjacent angles of a parallelogram are supplementary ... this tells you that
A + B = 180 (this does not mean A = B)
you were also told that B was 30 degrees bigger than A ...
B = A + 30
substitute (A+30) for B in the first equation ...
A + (A + 30) = 180
now, solve for A , then calculate B.