D Question 4 1 pts Use the first derivative test to determine the location of each local extremum and the value of the function at that extremum. f(x) = 3xe-x Local minimum at 3, 3 Local minimum at 1, O No local extrema Local maximum at 1, 3Question 5 1 pts Solve each problem. If the price charged for a bolt is p cents. then x thousand bolts will be sold in a certain hardware store. where p=125-. How many bolts must be sold to maximize revenue? 0 1750 bolts 0 875 bolts 0 875 thousand bolts 0 1750 thousand bolts D Question 6 1 pts Evaluate f"(c) at the point. f(x) = e4 - x, c= 2 Of"(2) = 1 Of"(2) = -4 Of"(2) = 14 O f"(2) = -20