A kitchen remodeling company determines that the marginal cost, in dollars per foot, of installing x feet of
kitchen countertop is given by
Find the cost of installing an extra
13 feet of countertop after 30 feet have already been ordered.
this question is using the antiderivative and i as far as solving it to 21/2x^2/3 and then putting into the formula for the problem which is
21/2(43)^2/3-21/2(30)^2/3 which is suppose to equal 27.5 but i got something else what do you think i did wrong ?
The bold is what i got.