# Thread: Help with Midterm Review for Test

1. ## Help with Midterm Review for Test

Please help with this calculus Mid-term review question. I have 12 more of these questions to go and I don't have a clue how to do this. I'm a beginner at calculus.

For the given cost function C(x) = 54sqrt(x)+ x^2/421875

a.) The cost at the production level 1450= My answer: \$2061.242443
b.) The average cost at the production level 1450= ?
c.) The marginal cost at the production level 1450=?
d.) The production level that will minimize the average cost=?
e.) The minimal average cost=?

2. ## Re: Help with Midterm Review for Test

Originally Posted by Michael111
For the given cost function C(x) = 54sqrt(x)= x^2/421875
This cost function is impossible. Either $C(x) = 54 \sqrt{x}$ or $C(x) = \frac{x^2}{421875}$. It can't be both.

-Dan

4. ## Re: Help with Midterm Review for Test

b.) 1.421546512
c.) .7159288115
d.) ?
e.) ?

Are those answers right? Anyone know how to do d.) and e.)?

5. ## Re: Help with Midterm Review for Test

I am really stuck guys, any help?