We know that supplementary angles add up to 180 degrees.
So, 128 + 5x = 180
Subtracting 128 from both sides gives:
5x = 52
Dividing both sides by 5 gives:
x = 10.4
Therefore, the value of x is A. 10.4.
Consider the diagram of supplementary angles.
the angles are 128 degrees, and 5x degrees
What is the value of x?
A. 10.4
B. 52
C. 61.6
D. 92
1 answer