Help me please it’s a quiz

I got 75 as an answer.

There are 180 degrees in a triangle. We know two of the angles.

80 degrees and (a-5) degrees

And we’re given 2a on a line. We know that two angles on a line are supplementary meaning they add up to 180 degrees.

So the other angle in the triangle is (180 - 2a). Now we just have to add up all three angles and set them equal to 180 to find a.

You should get a = 75.

Let me know if you have any questions!