Suppose that the demand for a magazine is 4300 copies each week if the magazine is given away for free and drops to 4105 each week if the price is $3 per copy. Find the demand function D q and use it to answer the following questions.

An investment offers a total return of 18 percent over the coming year. janice yellen thinks the total real return on this investment will be only 14 percent. what does janice believe the inflation rate will be over the next year?

Alarge tank is filled to capacity with 500 gallons of pure water. brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. the well-mixed solution is pumped out at the same rate. find the number a(t) of pounds of salt in the tank at time t.

During which of the following phases of the business cycle does the real gdp fall? a. trough b. expansion c. contraction d. peak