Chapter 7, Problem 69RE

the profit P for a company is P=100xe-x/400 where x is in sales. use the method of differentials to approximate the change in profit as the production increases from x=115 to x=120 units

A lighted candle burns outr according to the equation y'(t)=ky(t)_where y is the length (in inches) of the candle at any given time t (in hours). An 8-inch candle is reduced to half-length after 10 hours. Estimate the length of the candle after 12 hours. O 4.9 inches 3.5 inches O 5.6 inches O 2.8 inches

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