PLEASSSSSE HELPPPPPP This is my third post of this! I really need help

Mathematics

1 answer:

Nesterboy [21]3 years ago

6 0

Answer: x=25

solution:

we know that
The triangle external angle theorem states that: An exterior angle of a triangle is equal to the sum of the opposite interior angles

In this problem:
m∠9=m∠7+m∠8

substitute the given values:
(6x-20)°=30°+4x°

now solve for x:
6x-4x=30+20
2x=50
x=25 which is the final answer:)

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