The answer is A and D because if you square both of them, they are less than 16. hope this helps!
Add the two known angles together and subtract that number from 180° and that is your answer.
In case of an increase use this formula

So if the percentage of increase of 6%, the multiplier will be

In case of a decrease, the formula is mostly the same.

So if the percentage of decrease is 6%, the multiplier will be