Question

Find the missing numbers and show your work.

Answer 1

16) x = 10

17) x = 10

Explanation:

For these quadrilaterals, the sum of the two angles given must add up to 180.

16) x = 10

80 + (11x - 10) = 180

Subtract 80 from both sides:

11x - 10 = 100

Add 10 to both sides:

11x = 110

Divide both sides by 11:

x = 10

17) x = 10

35 + (14x + 5) = 180

Subtract 35 from both sides:

14x + 5 = 145

Subtract 5 from both sides:

14x = 140

Divide both sides by 14:

x = 10