Question

The shampoo you like to use is on sale. But you only get the lower price if you buy 3 bottles. You want to know how much you'll save.
Write a formula that will help you determine how much you'll save by buying 3 bottles
on sale.
Let's let
s = sale price per bottle
r = regular price per bottle
c = cost savings

Answer 1

The questions asks for a formula that determine how much you'll save for buying a specified amount of bottles. With this, we call ready know that the formula will begin as c= ____ because we see that c = the cost savings. 

Next, we know that the regular price minus sales pricing will result in c; your cost savings. So now we can fill in the blanks as c = r - s.

We're almost complete! Now all we need to do is insert the amount of items you're buying into the equation. Since we want to know the c = cost savings, then all we need to do is insert 3 into the regular price and the sales price of the equation. SO it'll look like this: c = 3r - 3s. 

Answer: c = 3r - 3s

Answer 2

$c = 3r - 3s$
Hope this helps! :)