2. [/1 Points] In 1990 (t = 0), the world use of natural gas was 751.58 billion cubic feet, and the demand for natural gas was growing exponentially at the rate of 4% per year. If the demand continues to grow at this rate, how many cubic feet of natural gas will the world use from 1990 to 2011? Note: Do not use commas in your answer. l:] Billion cubic feet of natural gas 3. [11 Points] At the time of the birth of a child, a parent wants to begin a college fund that will grow to $44000 by the child's 18m birthday. Interest is compounded continuously at 8.5%. What should the initial investment (P0) be? Note: Do not use commas in your answer. 35: 4. [11 Points] Find the accumulated present value of an investment over a 12-year period if there is a continuous money flow of $2700 per year and the current interest rate is 10.5%, compounded continuously. Note: Do not use commas in your answer. 14