Answer:
x = 21
it is a scalene triangle
Step-by-step explanation:
the sum of the internal angles of a triangle is 180 °, so 4x + 14 + 3x - 1 + x - 1 = 180 °
4x + 14 + 3x - 1 + x - 1 = 180
8x + 12 = 180
8x = 180 - 12
8x = 168
x = 168 : 8
x = 21
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angle 4x+14=
4 * 21 + 14 = 98°
angle x-1 =
21 - 1 = 20°
angle 3x-1 =
3 * 21 - 1 =
63 - 1 =
62°
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check
98 + 20 + 62 = 180°
