Please help me and explain below.

Mathematics

1 answer:

NARA [144]3 years ago

5 0

The answer is b. a triangle is equal to 180. to find x the equation would be 180= 3x-100+x-10+x-10 which is equal to 60. then sub 60 in to each equation. 3(60)-100=80, 60-10=50, 60-10=50

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