Pls show work for this math problem 100%

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°

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.