Q3 Compound Interest 10 Points A) Phillip wants to have $18,000 in 9 years, so he will place money into a savings account that pays 2.8% interest compounded weekly. How much should Phillip invest now to have $18,000 in 9 years? B) Charla would like to save $20,000 for a down payment for her first house. She currently has $15,000. At what interest rate, compounded monthly, would she need to invest her money in order to have the required $20,000 in 10 years? Round to the nearest 0.01% [Show algebraic work in finding the interest rate] C) Emile Invests $50,000 into an account at an annual rate of 1.5% compounded continuously. How much will be in the account after 30 years? Round to the nearest cent. Please select file(s) Select file(s) Q4 Radioactive 10 Points The mass of a radioactive material will decay over time as an exponential function. An initial 128- gram sample will only have 32 grams of radioactive material remaining after 8 days. A) Set up an exponential function M(t) = C(bt) which models the amount of remaining radioactive material after t days. Round your value of 6 to five (5) decimal places. B) Draw a graph of your model using an appropriate window. C) Using your graph of the model, determine the half-life of the material. Round to the nearest 0.1 days. Please select file(s) Select file(s)