A brokerage firm keeps track of the total money spent on Tesla stocks by their clients each day of the week, T(t). The function T(t) can be expressed as T(t) = N(t) · P(t), where N(t) is the number of stocks bought that day and P(t) is the price of Tesla stock that day. Suppose the price of a Tesla stock on day t = 0 is $700 and the number of stocks bought was 200. The graph of P'(t) is given below: y= P'(t) (a) What is the price of a Tesla stock at the end of day t = 7? (b) Suppose that N'(t) is given by N'(t) at = T sin + 1. How much Tesla stock did the clients buy on day 7? (c) Is the total money spent on Tesla stock increasing or decreasing on day 7? By how much?

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