Help please! With explanation

Suppose that the monthly cost, in dollars, of producing x chairs is C(x) = 0.002x" + 0.07x+ 19x + 700, and currently 45 chairs are produced monthly a) What is the current monthly cost? b)What would be the additional cost of increasing production to 50 chairs monthly? c) What is the marginal cost when x = 45? d)Use the marginal cost to estimate the difference in cost between producing 45 and 47 chairs per month. e) Use the answer from part (d) to predict C(47). a) The current monthly cost is $ (Round to the nearest cent as needed.)