Amanufacturer of college textbooks is interested in estimating the strength of the bindings produced by a particular binding machine. strength can be measured by recording the force required to pull the pages of a book from its binding. if this force is measured in pounds, what is the minimum number of books that should be tested to estimate the average force required to break the binding with a margin of error of 0.1 pound? assume that σ is known to be 0.9 pound. (round your answer up to the nearest integer.)

the k side

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the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).