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3 years ago

Please help, refer to picture

Mathematics

1 answer:

Mariulka [41]3 years ago

6 0

Answer:

99°

Step-by-step explanation:

∠7 and ∠8 are a linear pair, so are supplementary. Numbers are assumed to be degrees.

∠7 + ∠8 = 180

2x+15 + 3x = 180 . . . . . substitute given values

5x = 165 . . . . . . . . . . . . subtract 15, collect terms

x = 33 . . . . . . . . . . . . . . . divide by the coefficient of x

∠8 = 3x = 3·33 = 99 . . . . . degrees

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