(a) The interior angles of any triangle sum to 180° in measure. So
(8x + 2) + 70 + 60 = 180
Solve for x :
8x + 132 = 180
8x = 48
x = 6
(b) Evaluate 8x + 2 when x = 6 :
8•6 + 2 = 48 + 2 = 50
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