need help with all with explanations

Page 47: problems 8, 12, 15, 32 I Give a possible formula for the function in Problem 8. Solve: 12. A product costs $80 today. How much will the product cost in t days itthe price is reduced by (a) $4 a day (b) 5% a day 15. A 50 mg dose of quinine is given to a patient to prevent malaria. Quinine leavesthe body at a rate of 6% per hour. (a) Find a formula for the amount, A (in mg), of quinine in the body t hours after the dose is given. (b) How much quinine is in the body after 24 hours? (c) Graph A as a function of t. (C!) Use the graph to estimate when 5 mg of quinine remains. 32. Find a formula for the number of zebra mussels in a bay as a function of the number of years since 2014, given that there were 2700 at the start of 2014 and 3186 at the start of 2015. (a) Assume that the number of zebra mussels is growing linearly. Give units for the slope of the line and interpret it in terms of zebra mussels. (b) Assume that the number of zebra mussels is growing exponentially. What is the annual percent growth rate of the zebra mussel population