Use the exterior angle theorem to find the value of x in the triangle below.
A
x = 7
B
x = 5
C
x = 12
D
x = 15
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Answer:
A) x = 7
Step-by-step explanation:
7x + 1 + 7x + 6 + (180 - 15x) = 180
combine like terms:
-x + 187 = 180
subtract 187 form both side of the equation:
-x = -7
x = 7