Is the following equation linear or nonlinear??

Ineed to know the answer to this algebra question.

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2

Agatorade cooler has 36 cups of water. if a serving is 3/4 of a cup how many servings are in the cooler?