3 years ago

Can someone help me out please

Mathematics

1 answer:

Levart [38]3 years ago

7 0

Answer:

x = 9

∠B = 7 x 9 - 1 = 62°

∠BCD = 120°

Step-by-step explanation:

exterior angle of a triangle is equal to the sum of two opposite interior angles

∠BCD = ∠CBA + ∠BAC

10x + 30 = (7x - 1) + (58)

10x + 30 = 7x + 57

3x = 27

x = 9

∠B = 7 x 9 - 1 = 62

∠BCD = 10 x 9 + 30 = 120

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