Note: The "Amount of sales" label of the question is phrased poorly. s could be better labeled "profit from sales" or at least "Amount made from sales", etc.
Step-by-step explanation:
If you logically think about how the answer (now that you know it) relates to the question, it should make simple sense.
i.e. if you consider the first column where $24 is made from 12 customers, and divide the $24 made by the 12 customers, you'll see that each customer spends $2.
on the chart/graph it shows 6 new customers every week and if you want to see how much more money the owner makes off of each customer then...
subtract the first weeks number of customers from the second weeks to get the answer of 6 new customers per week as you can see on the chart/graph (this really isnt to important though)
then divide the total number of customers for 1 week by the profits made for that week to get an answer of 2 dollars for customers.
(i hope you understand because i just confused myself with my own explanation)
Note that first, you must find common denominators. What you multiply to the denominator, you multiply to the numerator. Multiply 10 to the numerator and denominator of 5/10
≡a mod p
≡1 mod p
≡1 mod 17
≡1 mod 17
mod 17 as
mod 17
mod 17
mod 17