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the angles below are supplementary. what is the value of x?

(picture below)

16.6
20
26.7
40

(3x+40)+80=180

Therefore x=20

Step-by-step explanation:

Since supplementory angles are of 180 degrees

(3x+40)+80=180

3x+120=180

3x=180-120

3x=60

X=60/3

X=20 degrees

And the angle would be

3*20+40=100

Other way

(3x+40)+80=180

3x+40=180-80=100

So 3x+40=100

3x=100-40=60

X=60/3=20

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8