The lenths of the sides of are 1/x, 1/2x, and 2/3x meters. find a rational expression for the perimeter of the triangle..can anyone pls..im bad at word problems

Please use parentheses (especially for denominators) when interpreting fractions.
For example, the parentheses of 1/(2x) is mandatory, otherwise 1/2x means (1/2)x by the rules of PEMDAS.
Similarly for 2/3x (or 2/(3x).

From the look of it, I assume you mean the side lengths are 1/x, 1/(2x), 1/(3x).  If it is the case, the solution follows:
The perimeter is the sum of the three sides.
so perimeter = 1/x+1/(2x)+1/(3x)=6/(6x)+3/(6x)+2/(6x)=11/(6x).

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