Ch9-1: How much must you invest at 7% interest in order to see your investment grow to $15,000 in 9 years? Show all work (display all the variables used in your formulas, and/or detail all steps used in determining the calculation)! Ch9.2: To save for her newborn son's college education, Lea Wilson will invest $7,000 at the beginning of each year for the next 17 years. The interest rate is 8 percent. What is the future value? Show all work (display all the variables used in your formulas, and/or detail all steps used in determining the calculation)