I don’t know how to handle this Calculus question and need guidance.

The revenue equation (in hundreds of millions of dollars) for barley production in a certain country is approximated by R(x)=0.0712x^2 + 1.1765x + 2.3208 where x is in hundreds of millions of bushels. Find the marginal revenue equation and use it to find the marginal revenue for the production of the given number of bushels.

(a) The marginal revenue equation is R'(x) ________ (Round to 4 decimal places as needed)

(b) Find the marginal Revenue for the production of 300,000,000 bushels
The marginal revenue is _______ hundred million dollars (Round to 2 decimal places as needed)

(c) Find the marginal revenue fo the production of 950,000,000 bushels
The marginal revenue is _______ hundred million dollars (Round to 2 decimal places as needed)