For Problems 11-13, Solve the Exponential Equation. 13) 27* = 81*+1 12) 216* = 6*+10 11) 3%* = 37x+8 For problems 14-15 write the equation that represents the situation. Use y= 14) Your starting salary of $35,000 increases by 4% each year. 15) A $900 sound system decreases in value by 9% each year. 16) The growth rate of a bacterial culture is 50% each hour. Initially, there are 10 bacteria. al Write an equation that represents the amount of bacteria there are after t hours. b) How many bacteria will there be after 8 hours. 17. Answer the following using the graph on the right . Bacterial Population y 800 a. Which type of exponential function is this? (4, 768) 700 600 b. Which of the following is the equation for this graph ? 500 1. y = 12( -)* 400 Popul 300 (0, 3) 2. y = 4x (1, 12) 3. y = (-)* 200 (3, 192) 100 4. y = 3(4)* (2, 48) 0 1 2 3 4 5 6 7 x c. After how many days is the bacteria population 192? _ Day d. What will the bacterial population be after day 5 7 600