Answer:
he is three i think
Step-by-step explanation:
6n +5=12. The answer is a
1a) coefficient 1b)variable
2a) coefficient 2b)coefficient
3a)coefficient 3b)coefficient
4a)coefficient 4b)coefficient
5a)coefficient 5b)variable
The perimeter of triangle ABC is: 54
21 + 18 + 15 =54