Question

Find the measure of angle A.(First solve for x, then plug it into 9x+4 to get the final answer!)​

Answer 1

40 degrees

Explanation:

Sum of all angles of triangle is 180 degrees.

So, 80+(9x+4)+(16x-4)=180

80+25x=180

25x=100 -> x=4

So angle A = 9(4)+4= 40 degrees