Neep help solving ASAP!

A= 15

Step-by-step explanation:

First step is we make an equation. As we know, the line is known as a straight angle, which always equals 180°. To make the equation, we are going to plug in the information we had, 4a° and 120°, plus our new information which is 180°. The equation should look like this.

4a°+120°=180°

We then subtract 120 from each side which will simply it to

4a°=60

We then have the leave the variable, a, by itself. To do that we must divide 4 to each side which will leave us with our answer.

a°=15

To verify our answer we can plug 15 back to the equation.

4(15)°+120°=180° = 60°+120°=180° = 180°=180°

step-by-step explanation: