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Answer:
30°, 60°, 90°
Explanation:
The value of x = 10 is correctly found. Then the angles are ...
3x = 3(10) = 30°
7x -10 = 7(10) -10 = 70 -10 = 60°
and the right angle: 90°
The angles shown in figure 5 are 30°, 60°, 90°.
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Additional comment
The answer choices make no sense, as none of them has a sum of 180°. The entire point of the exercise is that the sum of angles in a triangle is 180°.