This weekend Karen participated in a road race. The ratio of the number of miles she ran to the number of miles she walked is 4 : 5. How many miles did Karen run if she walked 10 miles?

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.