Answer:
B. 40
Step-by-step explanation:
This is a straight angle; this means that 20 and 4x are supplementary angles.
SUPPLEMENTARY ANGLES: TWO ANGLES WITH A SUM OF 180°.
[tex]20 + 4x = 180.[/tex]
First, subtract 20 from 180 and from 20.
[tex]20 - 20 = 0[/tex] (cancels itself out).
[tex]180 - 20 = 60.[/tex]
Now we are left with 4x = 160.
Lastly, divide 160 from 4.
[tex]160/4 = 40.[/tex]
Therefore, the value of x is 40.
Here's an attachment to make this process easier to understand.
