The length $L$ of a long wall is to be approximated. The angle $\theta$, as shown in the diagram (not to scale), is measured to be $48^{\circ}$, accurate to within $0.35^{\circ}$. Assume that the triangle formed is a right triangle.

1. What is the measured length of the wall? feet
2. Estimate an upper bound for the propagated error using a linear approximation. feet
3. What is an upper bound for the percent error? %