Answer: B.Infinitely many
Answer: 38° and 52°
Steps:
x + 38° = 90°
x = 90° - 38°
x = 52°
90° - 52° = 38°
The answer would be 78 because 10% of 60 is 6. 6 x 3 = 18 60+18=78
I don't have my calculator handy just now. But just looking at that problem, why don't you try +20 and -45 and see if they do the job.