Answer:
i think is c tell me if im right
102+39+B=180
141+B=180
-141 -141
B=39
its the first one
Answer: 320
<u>Step-by-step explanation:</u>





Answer:
5n is a term= true
3m and 5n are NOT like terms=true
these are the correct answers
Step-by-step explanation:
these are the wrong ones
a variable would be m or n
coefficients would be 3 and 5