Answer:
Step-by-step explanation:
Given that:
To evaluate the expression, we must simply substitute the given value of 
, which is 
, for :
Multiply:
Subtract:
-
To check your work, simply set the given expression equal to our solution, :
Add 
to both sides of the equation:
Divide both sides of the equation by the coefficient of , which is 
:
Since it matches the given value of , our solution is correct!
A. -2.5+3.5n is the answer
Answer:
Step-by-step explanation:
Fixed monthly fee = $20
Amount charged per minute for long distance calls = $0.20
denotes total cost such that 
minutes are used for long distance calls.
Amount charged for minutes for long distance calls 
Therefore, an equation for the total cost, C, when N minutes are used for long distance calls is
Any circle that can given by
have a center of
You can choose
any positive value for the radius
Hence, there are infinity circles.
