Marginal cost $60; 120 items cost $9500 to produce. The linear cost function is

C(x) = $60 + ($79.17/unit)x

Step-by-step explanation:

The linear cost function is represented by a straight line with slope $60/unit and y-intercept $60:

C(x) = $60 + ($9500/120 units)x, or

C(x) = $60 + ($79.17/unit)x

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

answer:   y=2x-3

step-by-step explanation: