I need help with these questions please. I need all answers correct please. 6. A colony of bacteria is increasing at the rate of 15% each hour. There are 3,500 bacteria in the colony at the time observations begin. Find an exponential growth model for A, the number of bacteria t hrs after the first observation. (See Example 2 in this section.) A = Use the model to determine the number of bacteria in the colony 11 hrs after the initial observation. (Round your answer to the nearest whole number.) bacteria 7.The value of a certain rare silver dollar was $50,000 in 1980. A price history of the silver dollar shows that it has been doubling in value every 20 years. Find an exponential growth model for A, the value of the coin (in dollars) t years after 1980.(See Example 3 in this section.) 8.A desalinization process is eliminating 10% of the salt from seawater every 10 minutes. There are initially 550 g of salt in 10 liters of water. Find an exponential function for A, the grams of salt in the 10 liters of seawater t minutes after the process has begun. (See Example 5 in this section.) A = Use the model to predict the amount of salt (in grams) in the seawater after 55 minutes. Round to the nearest whole number. g 9.Suppose a cup of coffee contains approximately 70 milligrams of caffeine. Suppose the time it takes a healthy person to metabolize one-half of the consumed caffeine is approximately 6 hrs. Find an exponential function that gives A, the number of milligrams of caffeine in the body t hrs after drinking a cup of coffee. (See Example 6 in this section.) 10.Salicylate is active in aspirin. The following table shows the amount of salicylate in the bloodstream of a certain person t minutes after ingesting 200 milligrams of aspirin. Time (min) 0 20 40 60 80 100 120 Salicylate (mg) 200 177 157 144 123 114 99 Use exponential regression to write an exponential decay function for A, the milligrams of salicylate remaining t minutes after ingesting the aspirin. Round constants to the nearest thousandth. (See Example 7 in this section.) A = Use the model to predict the amount of salicylate (in mg) remaining 3 hrs after ingesting the aspirin. Round to the nearest whole number. mg