The correct answer is C: -3b and 4b.
Answer:
3 3
6 9
9 15
12 21
Step-by-step explanation:
For the time add 3 each time
For the distance add 6 each time
4/5 ,8/10, 16/20,
You multiply both numbers with the same number.
For ex. 4×2=8 5×2=10 so we have 8/10
