Answer:
5 - x=90°
6- angle c= 75°
7- angle a = 90°
c = 75
Step-by-step explanation:
All triangles add up to 180. Add the two angles which you have, and then subtract that from 180. that will be your third angle value.
a) -10 b) 7
a) 2(x+ 3) = x - 4
2x + 6 = x - 4
2x - x = -6 - 4
x = -10
b) 4(5x - 2) = 2(9x + 3)
20x - 8 = 18x + 6
20x - 18x = 6 + 8
2x = 14
x = 14/2
x = 7
C = 20°
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I'm pretty sure it's -3/2
