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2 years ago

10 POINTS PLEASE HELP

Mathematics

1 answer:

lbvjy [14]2 years ago

5 0

Answer:

m∠A = 49°

Step-by-step explanation:

According to Angle Sum Property,

angles of the Δ add up to 180°
∠A + ∠B + ∠D = 180°
5x - 6 + 7x - 24 + 78 = 180
12x + 48 = 180
x + 4 = 15
x = 11

m∠A

5x - 6
5(11) - 6
55 - 6
49°

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