Answer:
see explanation
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the two opposite interior angles.
(1)
3v + 1 + 49 = 131
3v + 50 = 131 ( subtract 50 from both sides )
3v = 81 ( divide both sides by 3 )
v = 27
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(2)
3b + 2 = 112 + 34
3b + 2 = 146 ( subtract 2 from both sides )
3b = 144 ( divide both sides by 3 )
b = 48
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(3)s
3f + 1 = 90 + 25
3f + 1 = 115 ( subtract 1 from both sides )
3f = 114 ( divide both sides by 3 )
f = 38
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(5)
5c + 4 + 34 = 68
5c + 38 = 68 ( subtract 38 from both sides )
5c = 30 ( divide both sides by 5 )
c = 6
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(6)
2d + 1 + 90 = 141
2d + 91 = 141 ( subtract 91 from both sides )
2d = 50 ( divide both sides by 2 )
d = 25
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(7)
6r + 90 = 114 ( subtract 90 from both sides )
6r = 24 ( divide both sides by 6 )
r = 4
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