For this case we have the following polynomial:

What we must do for this case is to factor the polynomial, so that we have:
1) The number of bottles
2) the weight of each bottle.
We have then:

Answer:
A factorization that could represent the number of water bottles and weight of each water bottle is:

It would be 0 because as you go along it doesn't go up but keeps moving. An undefined slope is up and down/vertical.
There is an app that will help for these types of questions called, "Showmath."
Answer:
Markup: $9 ; Selling Price: $24
Step-by-step explanation:
The store makes a profit of $15, to find the mark up of 60%, multiply 15 x 60%.
15 x 0.6 = 9
Add the markup price to the original price.
9 + 15 = $24
The selling price is $24
Answer:
2
Step-by-step explanation:
it's literally 6-4 = 2