Anumber to the 8th power divided by the same number to the 5th power is 216 what is the number?

6
let a be the number
(a^8)/(a^5) = 216
(a^3) = 216
a = 6

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