5. Which of the following statements is true? (a) Two acute angles can be complementary to each other
(b) Two obtuse angles can be complementary to each other
(c) Two right angles can be complementary to each other
(d) One obtuse angle and one acute angle can be complementary to each other

A- two acute angles can be complementary

Complementary angles add to 90°, and obtuse angles are defined as being over 90°, so no answer with obtuse would work.
A right angle is 90° exactly, and 2 would add to 180°, so C cannot be right.

1 - 2-n
2- 9xn-8
3- n divided by 4
4- 8-4xn
5- 14+n
6- 7xn-28
7-n divided by 9
8- 10-n
9- nx16
10- n divided by 10
11- 21+n
12- n+15
13- 3xn-1
14- 18-6xn
15- n divided by 12
16- 6+ 6xn
17- 5xn-11
18- n divided by 5
19- nx7
20- 6-nx8

I am not 100% sure this is what it means by writing the given statement in symbols but if it does mean this then these are the answers:)