The weekly marginal cost of producing x pairs of tennis shoes is given by the following function, where c(x) is cost in dollars. upper c prime (x )equals 18 plus startfraction 500 over x plus 1 endfraction if the fixed costs are $4 comma 000 per week, find the cost function. what is the average cost per pair of shoes if 1,000 pairs of shoes are produced each week?

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d