Consider 2^1, 2^2, 2^3, 2^4,2^5,... look for a pattern, and hence find the last digit of 2^111

2.5961484293×10^13

Step-by-step explanation:

2^1 = 2

2^2 = 4

2^3 = 8

2^4 = 16

2^5 = 32

2^111 = 2.5961484293×10^13

Hope this helps! <3

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