12. Determine oint(s) on the curve y = x2(x3- x)2 where the tangent line is horizontal. 13 Chapter Problem The owners of Mooses, Gooses, and Juices are interested in analysing the productivity of their staff. The function N(t) = 150 - 600 V16 + 3/2 models the total hain rule to number of customers, N, served by the e of x. staff after / hours during an 8-h workday Ost=8). a) Determine N'(t). What does the derivative represent for this situation? b) Determine N(4) and N'(4). Interpret the