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=?