Question

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Answer 1

oh is 5

Answer 2

ok u know how the line will make 180 degress...!
so, 5x+12+3x+128= 180

Answer 3

then u solve for x....
so, 8x +140=180... subtracted 140 from both sides and u get
8x=40.. since ur solving for x, your goal is to leave it alone. so u divide by 8...
40/8= 5 so x=5

Answer 4

hope it helps
:)

Answer 5

Straight angle = 180°
( 5x + 12)° + ( 3x + 128)° = 180°
-> 8x + 140° = 180°
-> 8x = 40°
=> x = 40°/8 = 5°