Answer:
Yes
Step-by-step explanation:
for pens you are adding 3 each time
for boxes you are adding 1 each time
it is correct because they all have the same unit rate
3/1=3
6/2=3
9/3=3
12/4=3
Answer:
I dont really know what your asking :/
Step-by-step explanation:
Answer: 
Step-by-step explanation:

Hello
1 km = 1000 m
12 km = 12,000 m
Each day, she runs 10 * 400 m = 4000 m
12,000 m / 4000 m = 3
It will take 3 days.
Have a nice day
Answer:
set 1 : 23.5
set 2 : 54
Step-by-step explanation:
lower quartile - upper quartile = answer