Hi! Really need help with these quick questions. all on differential equations and their application. please help!

I Question 23 (3 points) If a population of is becoming extinct and the population is decaying exponentially. Assume that there are 2.000 animals, and there will only be one animal in 50 years. What is k. the rate of decay? I Question 20 (3 points) Many populations are facing negative growth rates. If the population of the Ukraine was 60 million in 2008 and will shrink to 59.3 million people in 2009, write the equation which models the Ukraine population over time if the population loss is proportional to population at a given time. I Question 24 (3 points) Assume that the rate of evaporation for water is proportional to the initial amount of water in a bowl. If Jill places 1 cup of water outside and notices that there is 36 cup of water 6 hours later. Can she use a differential equation to find when there is no water left? I Question 22 {3 points) Assume that the rate of evaporation for water is proportional to the amount of water in a bowl. If Jill places 1 cup of water {8 ounces) outside and notices that there is 56 cup of water 7 hours later. How much water will be left in 9 hours