The measure of an angle is 4y. find the measure of its complement.
a) 90 - 4y
b) 90 + 4y
c) 180 - 4y
d) 180 + 4y

Complementary angles are angles whose measure add up to 90°.

So, if one angle is 4y, the complementary angle is 90°- 4y. Choice A.

Complementary angles does not necessarily need to share a line or vertex. As long as both angles have a sum of 90°, then, they are complementary angles.

Angles who has a sum of 180° are called supplementary angles. 

The Sum is 49/12 (improper), or 4 1/12 (mixed).

The Difference of these 2 fractions would be 2 1/3 - 1 3/4 instead of adding them. The answer is 7/12.

Step-by-step explanation:

I did it by converting the mixed fractions into improper fractions, then making the denominators the same, and adding them together.