There is a job that needs to be done. Bob can complete the job in 10 days alone, Jeff can complete the job in 15 days alone. Bob and Jeff work together for 4 days. Then Jeff has to finish the rest. How many more days does Jeff need?

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.