riverdaleoncerfan
25.11.2020 •
Mathematics
What is the value of a?
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Ответ:
66
Step-by-step explanation:
The sum of all of the angles in a triangle is 180. So all three angles would add up to 180:
(a + 21) + 57 + (a - 30) = 180
Combine like terms:
2a + 48 = 180
2a = 132
a = 66
Ответ:
8(2b+3)
Step-by-step explanation: