Answer:
42
138
42
48
Explanation:
For the first answer, it is a vertical angle to the 42 degree angle which is defined, meaning that they are equal
The second answer is a supplement of the 42 degree angle, which add up to 180 degrees, 180-42=138
The third angle is an opposite interior angle to the 42 degree one, meaning they are equal
And for the final answer, the 42 degree angle we just found and it are complementary, so they add up to 90 degrees, 90-42=48