A photocopy store advertises the following prices: 5/c per copy for the first 20 copies, 4/c per copy for the 21st through 100th copy, and 3/c per copy after the 100th copy. Let x be the
number of copies, and let y be the total cost of photocopying. (a) Graph the cost as x goes
from 0 to 200 copies. (b) Find the equation in the form y = mx + b that tells you the cost
of making x copies when x is more than 100.

a framing bias

step-by-step explanation:

rodrigo is subject to a framing bias i believe.

answer: your answer is a

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)