It already is done i think
Answer:
5
Step-by-step explanation:
3x+2-3x+7+5x
3x-3x+5x+2+7
5x+9
Coefficient is the 5 of the 5x.
Answer: 50,001²-49,999²=0,2.
Step-by-step explanation:

Answer: 1/2, four times
Step-by-step explanation:
One split into two gets you two one-halfs. So two would be twice as many.