The formula t = logK
0.045 log e gives the time t (in years) that it will take an investment P that is
compounded continuously at a rate of 4.5% to increase to an amount K times the original
principal.
If Paul invests $1,000 in a savings account that is compounded continuously at a rate of
4.5%, when will his investment double? Round your answer to the nearest tenth of a year.

(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.