Answer:
30°
Step-by-step explanation:
We know that the angles in triangles always add up to 180°. There is also a right angle in this triangle, which is 90°.
Using this policy, we can assume that:
(3x - 30) + x + 90 = 180
First, we need to combine like terms. We can combine the 3x and the x, and the -30 and the 90.
4x + 60 = 180
Subtract 60 from both sides.
4x = 120
Divide by 4 on both sides.
x = 30
