math
posted by Marie P. on .
A tire company determines that to manufacture a certain type of tire, it costs $9000 to set up the production process. Each tire that is produced costs $21 in material and labor. The company sells this tire to wholesale distributors for $49 each.
(a) Find a linear function C that models the total cost
C(x)
of producing x tires.
C(x) =
I got 9000+21x
(b) Find a linear function R that models the revenue
Not sure
R(x)
from selling x tires.
R(x) =
Also not sure
(c) Find a linear function P that models the profit P(x) from selling x tires. [Note: profit = revenue − cost.]

C = 9000 + 21 x yes
Revenue = R = 49 x
P = 49 x  21 x  9000
so
P = 28 x  9000
now for some reason they did not asdk how ma tires must be sold to break even but it would be
P = 0
28 x = 9000
x = 9000/28 
revenue=49x
profit=revenuecost