C=x.19+.25
C means the total cost
X means the extra minutes
Use vertical pipes around the value.
Example:
abs(-4) = |-4| = 4
Is there an equation for this?
Answer:
The minimum value for
is
.
Step-by-step explanation:
Given function is 
We need to find the maximum value or the minimum value for the function.
Now, differentiate
w.r.t
.


Now, we will equate
to find critical point.

Plug this critical point in to the function
we get,

Also,
which is positive, We have minimum value.
So, the minimum value for
is
.