Question

Find the value of x.
A.5
B. 40
C. 45
D. 20​

Answer 1

B. 40

Explanation:

This is a straight angle; this means that 20 and 4x are supplementary angles.

SUPPLEMENTARY ANGLES: TWO ANGLES WITH A SUM OF 180°.

`20 + 4x = 180.`

First, subtract 20 from 180 and from 20.

`20 - 20 = 0` (cancels itself out).

`180 - 20 = 60.`

Now we are left with 4x = 160.

Lastly, divide 160 from 4.

`160/4 = 40.`

Therefore, the value of x is 40.

Here's an attachment to make this process easier to understand.

Answer 2

(B) x = 40

Explanation:

4x + 20 = 180

4x = 160

x = 40