what are the circled questions

SECTION 5.5 PROBLEM SET: APPLICATIONS OF EXPONENTIAL AND LOGARITHMIC FUNCTIONS 9) A city has a population of 50,000 people in 10) 200 mg of a medication is administered to a the year 2000. The city's population patient. After 3 hours, only 100 mg remains increases at a constant percentage rate. in the bloodstream. Using an exponential Fifteen years later, in 2015, the population of decay model, find the hourly decay rate. this city was 70,000. Find the annual percentage growth rate. 11) An investment is losing money at a constant 12 Using the information in question 11, how percentage rate per year. The investment was many years does it take until the investment initially worth $25,000 but is worth only is worth only half of its initial value? $20,000 after 4 years. Find the percentage rate at which the investment is losing value each year (that is, find the annual decay rate)