Answer:
45, 75 and 25 degrees
Step-by-step explanation:
First problem: (2x) degrees = 90 degrees; thus, x = 45 degrees.
Second problem: same principle: x + 15 degrees = 90 degrees (that is, x and 15 degrees are complementary angles). Thus, x = 75 degrees.
Third problem: 4x - 10 degrees = 90 degrees. Adding 10 to both sides, we get 4x = 100, and so x = 25 degrees.
