I could use some help with these questions. Please provide easy to read work/solutions/answers

1. (5 Points) A publisher estimates the demand for a certain book to be 9,000 copies in a year. Each book costs $3 to print, and setup costs are $3, 000 for each printing. If storage costs are $6 per book per year, find how many books should be printed per run and how many printings will be needed in the year if costs are to be minimized. (You can use a calculator here for basic arithmetic computations) 2. (3 points) Find dx dy for the equation (x + y) 10 = x2 + y2 3. (2 points) Write an expression for the value after 10 years if you invest $5, 000 at a rate of 7%, compounded monthly. (Leave in exact form, and you don't have to simplify)