Question

Help with #12!
Find the measure of

Answer 1

239

Explanation:

Answer 2

m∠ACD = 76

Explanation:

m∠A = (4x + 15)

m∠B = 21

m∠C = (180 -(7x + 6))

all triangle measures add up to 180

(4x + 15) + 21 + (180 -(7x + 6)) = 180

(4x + 15) + 21 + (180 -7x - 6) = 180

4x + 36 + 174 - 7x

210 - 3x = 180

-3x = -30

x = 10

7(10) + 6 = 76

Check:

180 - 76 = 104

4(10) + 15 = 55

21 + 55 + 104 = 180