Mat evaluate this piecewise function at x=-4 and x=4

If x=-4, that means that since we have x² at x≤-4, it encompasses -4 (due to the line at the bottom). (-4)²=16. For 4, since 4>1 and it's √x if x is over 1, √4=2

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