If 2 lemons cost 15 since how many can be bought for 60 cents

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

What are the values of each variable in the diagram below?

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.