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Do you know which one?
I don't know which one, because I don't look at answer choices. But I can help you to find the answer.
they're the greatest numbers
The question asks the \(average\) rate of change the greatest, which means that the difference has to be divided by the number of hours in the interval. Give it another try.
ok just a sec
I divided the bottom numbers
Can you state the answer instead of the letter? This will avoid misunderstanding, and will help you check you answer unconsciously.
which gave me 6.8 while the other gave me 1
No, you got the wrong idea. The numbers shown are cumulative, it said "number of bags sold \(after\) door was opened. So you need to subtract consecutive numbers to get the number of bags sold during the period. |dw:1441585942275:dw| So you choose the maximum average number of bags.
Sorry, the last column is not clear, but you can still see the calculation.
I get that 1 and 22 would be correct. What I don't understand is how you know what to dived the number by
Rate of change = (change in y)/(change in x) In the current context, change in y=number of bags sold change in x=number of hours elapsed So for the first period between 1st and 3rd hours, change in y = 147-22 = 125 bags change in x = 3-1=2 hours so the average rate of change is 125bags/2 hours = 62.5 bags / hours. Repeat the same calculation for the other periods and you will get to choose the period containing the maximum number of bags sold per hour.
oh I get 3-1 gives you 2 therefore you divide by 2, ok thanks
Exactly! You're welcome! :)
So it was A?, Would you help me again