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=?

Re: Help with Midterm Review for Test

Quote:

Originally Posted by

**Michael111** For the given cost function C(x) = 54sqrt(x)= x^2/421875

This cost function is impossible. Either $\displaystyle C(x) = 54 \sqrt{x}$ or $\displaystyle C(x) = \frac{x^2}{421875}$. It can't be both.

-Dan

Re: Help with Midterm Review for Test

Hello, thank you for your reply. C(x) = 54sqrt(x)+ x^2/421875

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.)?

Re: Help with Midterm Review for Test

I am really stuck guys, any help?