a If y = 4x 3 x , find dy dx and interpret its meaning. b The position of a car moving

Chapter 15, Problem 7

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a If y = 4x 3 x , find dy dx and interpret its meaning. b The position of a car moving along a straight road is given by S = 2t2 + 4t metres where t is the time in seconds. Find dS dt and interpret its meaning. c The cost of producing x toasters each week is given by C = 1785 + 3x + 0:002x2 dollars. Find dC dx and interpret its meaning

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