Answer:
see explanation
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
(6)
Sum the 3 angles and equate to 180, that is
4 + 7x + 39 + 53 = 180
7x + 96 = 180 ( subtract 96 from both sides )
7x = 84 ( divide both sides by 7 )
x = 12
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(7)
Sum the 3 angles and equate to 180, that is
6x - 5 + 5x + 75 = 180
11x + 70 = 180 ( subtract 70 from both sides )
11x = 110 ( divide both sides by 11 )
x = 10
