Answer:

Step-by-step explanation:
Given
Represent number of DVDs with x


(at most)
Required
Represent as an inequality
If 
x DVD would cost:


So, to make an order of x DVDs, Deacon will pay for
x DVDs and Handling Fee
So:

Recall that his budget is at most $75
This implies that: 
So, the relationship between his payment and budget is:

c^2 = a^2 + b^2
c^2 = 16^2 + 20^2
c^2 = 256 + 400
c^2 = 756
Now, square root both sides.
<h2><em><u>
c = 27.5 in</u></em></h2>
3d+ 3s = $21 because they bought three drinks and three snacks
The answer is c = .6x + 5
In order to find the equation, note that the price per pound is contingent upon the weight in x. Therefore, we can multiply the two together.
We also need to add the constant, which is 5.