Someone help and please explain clearly !

Step-by-step explanation:

(a) Your $160 is correct.

(b) No, this is not a proportional relationship, because the graph does not go through the origin.  That, in turn, is because there is a fixed, up-front cost of $120.

(c) The total cost as a function of the number of months, m, is

TC(m) = $120 + ($40/month)m

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

the answer is 24

step-by-step explanation: