The constant of proportionality is 5
For the first bar day: 1 cell phone sold: 5 (unit rate:5)
second bar day: 2 cell phones sold: 10 (unit rate:5)
third bar Day: 3 cell phones sold: 15 (unit rate: 5)
fourth bar day: 4 cell phones sold: 20 (unit rate 5)
Basically you divide the cell phones sold by the day or 
Hope this helped <3
Answer:
9.A 10.A its a little confusing to explain but yard just isn't a metric unit and humans don't weigh tons or pints
Answer:
r(n) = 1000·(2/5)^n
Step-by-step explanation:
Since the tortoise travels 3/5 the remaining distance, the remaining distance at the end of the day is 2/5 of what it was at the beginning of the day. So, the function can be modeled by an exponential with a "growth" factor of 2/5:
r(n) = 1000·(2/5)^n
where r(n) is the number of remaining feet after n days of travel.
