Find the measure of angle A.(First solve for x, then plug it into 9x+4 to get the final answer!)
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Answer:
40 degrees
Step-by-step 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