Question

Pls show work for this math problem 100%

Answer 1

Answer:

X + 78

m<B= 10

Step-by-step explanation

Got it correct on quiz/

Answer 2

Answer:

x = 11, ∠ B = 71°

Step-by-step explanation:

In a parallelogram, consecutive angles are supplementary, that is

∠ A + ∠ B = 180°, thus

8x + 21 + 5x + 16 = 180

13x + 37 = 180 ( subtract 37 from both sides )

13x = 143 ( divide both sides by 13 )

x = 11

Thus

∠ B = 5x + 16 = 5(11) + 16 = 55 + 16 = 71°