\fExponential Functions/Logs Practice 11. 73x-1 = 85.6 12. 4.63x+1 = 26*+3 13. -5- 3(5*) = -23 14. The dangerous chemical compound Jaime-onium has been released into the DHS water system. Luckily Gabriel has the antidote to save the day. When first released, there were 57,000 parts-per- gallon (PPG) in the water system. 5 minutes after Gabriel releases the antidote, there were only 312 PPG of Jaime-onium in the system (a safe level). Assuming that the amount of Jaime-onium decreased exponentially, what is the rate of decay? A = 312 312 - s70 0e N = 57,000 1 = 2 $7000 T = 5 15. Abby and Charlotte invest $3000 in an account that compounds, 4,8% interest monthly. How long will it take for them to save the $10,000 necessary to buy one Taylor Swift concert ticket? A = 10,000 10.000 = 30 01- 048# N = 3000 300 1 = 0.048 MR. 048 t LAG T = 2 1 33:33 69 4.41 = 6 16. Christina and Brynn loan Ronan $7 to buy some new jokes. If the jokes cost $12, what interest rate would Ronan need to secure in an account that compounds interest continuously if he wants to have them for his graduation speech in 2 years? A = 12 N = 7 1 = 2 T - 2