Which of these is a simple event?

a. getting a 4 on a roll of one die.
b. getting a sum of 4 on a roll of two dice.
c. getting doubles on a roll of two dice.
d. getting two even numbers on a roll of two dice.

A simple event consists of getting one outcome possible. So, your answer is A.

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8