A cost function c(x) for producing x number of units: c(x) =20x+150

Question

c) sketch the cost function c(x) from x=0 to x=50
d) how much will the cost function change if the number of units produced is increased by 6 units

Answer 1

this just a line, with slope=20
so, if x grows by 6, c(x) must grow by 20*6=120