Step-by-step explanation:
Equation of given line is:

Thus, the slope of required line is 2.
The answer would b be d 8 I think
Answer:

Step-by-step explanation:
Given


![Interval: [1,8]](https://tex.z-dn.net/?f=Interval%3A%20%5B1%2C8%5D)

Required
Find c using Intermediate Value theorem
First, check if the value of M is within the given range:







M is within range.
Solving further:
We have:


Substitute 21 for f(x) in 

Express as quadratic function


Expand



or 
or 
The value of
is outside the ![Interval: [1,8]](https://tex.z-dn.net/?f=Interval%3A%20%5B1%2C8%5D)
So:



By comparison:

Answer:
The total cost would be 29.15$
Step-by-step explanation:
multiply 27.50 by 0.06 to get 1.65. Then add 27.50 and 1.65, to get 29.15