An employee wants to invest $50,000 in a pension plan. One investment offers 4% compounded semiannually. Another offers 3.25% compounded continuously. (a) Which investment will earn more interest in 6 yr? (b) How much more will the better plan earn? (a) After 6 years, (b) The better plan will earn $ more. will earn more interest. A woman has a taco stand. She found that her daily costs are approximated by C(x) = x²-40x +670, where C(x) is the cost, in dollars, to sell x units of tacos. Find the number of units of tacos she should sell to minimize her costs. What is the minimum cost? The number of units of tacos she should sell to minimize her costs is The minimum cost is $