Answer:
The dependent variable is N; Number of Napkins
The independent variable is C; Number of Customers
Step-by-step explanation:
Given

Required
Determine the dependent and independent variable
Dependent variables are variables that standalone and are not influenced by other variables;
In the given parameters
<em>The customers, C is the independent variable</em>
Independent variables are the opposite of the dependent variables; They depend on other variables for their own values.
In the given parameters
<em>The number of Napkin, N is the dependent variable</em>
<u>Given:</u>
A triangle with a base length of 22 ft and a height of 20 ft.
<u>To find:</u>
The area of the given triangle.
<u>Solution:</u>
The area of a triangle is obtained by multiplying
with its base length and its height.
The area of a triangle 
The height is the distance from the base to the highest point on the triangle and the length of the base is the base length.
The given triangle has a base length of 22 ft and a height of 20 ft.
The area of the triangle 
ft².
The given triangle has an area of 220 ft².
<ABC= <MNP
...............
The measure of arc EF = 146 degrees because its central angle = 146 degrees.
Line parallel to y=x+11 so slopes are equal then
y= x+b
Passing through the point C (-6;2) then C belongs to this line
yc=xc+b
b= 6+2
b= 8
So y intercept is equal to 8