If the measures of two opposite angles of a parallelogram are represented by 3x+40 and x+50 what is the measure of each angle of the parallelogram

Opposite angles in a parallelogram are congruent, so 3x+40 = x+50 and x = 5.  That means that those 2 angles measure 3(5)+40 = 55, and the other 2 angles, which are congruent to each other, add up with the other to equal 360. 360-55-55=250.  Divide that between the other 2 remaining angles to get that those angles each measure 125.

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b