Let's look at the equation for a perimeter:
P=Width * Length
We also have another equation for P:
P[tex] \geq [/tex]134ft
We know Width(29ft), so let's substitute:
(29)(Length) [tex] \geq [/tex] 134
If we isolate Length, by dividing 134/29, we get:
Length [tex] \geq [/tex] [tex] \frac{134}{29} [/tex]
which simplifies to about 4.6207
Therefore, I believe all possible values for the Length of the deck would be:
([tex] \frac{134}{29} [/tex], ∞)
Or: {x(x≥[tex] \frac{134}{29} [/tex])}
Hopefully this helps!