Please help me with these 2 problems, they are giving me a hard time.

Tutorial Exercise A manufacturer has determined that the total cost C of operating a factory is C = 2x2+ 60x + 200, where x is the number of units produced. At what level of production will the average cost per unit be minimized? (The average cost per unit is C/x.) Click here to begin! Need Help? Read It + Show My Work (Optional) ? Submit Answer 5 of 15Use a graphing utility to complete the table and estimate the limit as x approaches infinity. Then use a graphing utility to graph the function and estimate the limit graphically. (Round your answers to one decimal place.) f(X ) = . 4x2 X +1 100 101 102 103 104 105 106 f(x) lim f(x) = X - 00 Need Help? Read It # Show My Work (Optional) ? Submit Answer View Previous Question Question 3 of 15 View Next