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leonid [27]
4 years ago
6

What is the correct choice ?

Mathematics
2 answers:
elena-s [515]4 years ago
8 0

Answer:C

Step-by-step explanation:

y + y+ 30 + 40 = 180  the three angles added together = 180

2y + 70 = 180 subtract 70 from both sides

2y = 110  divide by 2 on both sides

y =55

Ainat [17]4 years ago
4 0

Answer:C - 55

Step-by-step explanation:

Beacuse à triangle is equal to 180 and so you add 40 and 30 then you subtract that with 180 and divided it by two since y is the same number.

Hope this helped :) I tried my best to explain it

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