Question

Number 5 am stuck pls help

Answer 1

Answer:

30

Step-by-step explanation:

Exterior angle property: Exterior angle equals sum of interior opposite angles.

5x + 30 + 3x + 40 = 7x + 80

5x + 3x + 30 + 40 = 7x + 80

 8x + 70 = 7x + 80

Subtract 70 from both sides

8x = 7x + 80 - 70

8x = 7x + 10

Subtract 7x from both sides

8x - 7x = 10

x = 10

7x + 80 = 7*10 + 80 = 70 + 80 = 150

7x +80 +∠ ACB = 180   {linear pair}

150 + ∠ACB = 180

∠ACB = 180 - 150 = 30

Answer 2

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