4. Simplify the expression. Then evaluate the expression when x = 3.
12x + 4 - 4x

Simplified: 8x+4 (do this by combing like terms, in this case it’s 12x and -4x because they both have X)
When x=3: 8(3)+4 = 28

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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