For this case we have the following functions:

We must subtract the functions:

We build a table of values for 

Answer:

Number 5 is 22 and 35
For example: 7+1=8, 8+2 =10, 10+3=13, 13+4=17, 17+5=22, 22+6=28, 28+7=35
B
Explanation: I guessed and it was right
Answer:
(6t) + (3t) + (4t)
Simplified it would be 13t