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Anna35 [415]
4 years ago
13

AC=3x+3,AB=-1+2x and BC=11 find x

Mathematics
1 answer:
Talja [164]4 years ago
7 0
∠AC = (3x + 3)°
∠AB = (2x - 1)°
∠BC = 11°

                 ∠AC + ∠AB + ∠BC = 360°
       (3x + 3)° + (2x - 1)° + 11° = 360°
                3x + 2x + 3 - 1 + 11 = 360
                             5x + 2 + 11 = 360
                                   5x + 13 = 360
                                         - 13   - 13
                                           5x = 347
                                            5       5
                                             x = 69.4
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