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1. The marginal revenue function at output x is
MR (x) = 2x + 3.
Calculate revenue from the sale of 100 products.

Can't find a way to complete this task, is it somehow connected with derivatives?

2.

3. You'll have to do better than that. "Marginal" sounds like it might BE the derivative, no?

4. Yes, if I remember correctly (I once had the "pleasure" of teaching a "Math for economics and Business Administration" class) the "marginal revenue" is the derivative of a continuous revenue function ("first difference" if it is defined only for integers). So given that the marginal revenue is $\displaystyle 2x+ 3$ the revenue from the sale of 100 products is the integral of 2x+ 3 with respect to x from 0 to 100.