Question: Problem 16. (I point) A Cepheld variable star is a star whose brightness alternately increases and decreases, Suppose that Cephei loe is a star for

Problem 16. (I point) A Cepheld variable star is a star whose brightness alternately increases and decreases, Suppose that Cephei loe is a star for which the interval between times of maximum brightness is 4.6 days. Its average brightness is 3.9 and the brightness changes by +/-0.4. Using this data. we can comtruct a mathematical model for the brightness of Cephei Joe at time ?. where / is measured in days: 80 - 39+04 in 2our/4.6) (a) Find the rule of change of the brightness after / days. Rate of change = (b) Find the rate of increase after one day. Rate of incruz = Problem 17. (1 point) Find the 24" derivative of y - cos(3x) by finding the first few derivatives and observing the pattern that

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