$\backslash$table$[[2,20,6\mathrm{.}5],[3,25,8\mathrm{.}5]]$

$6\mathrm{.}8$ A sanitary landfill receives $600f{t}^3$ of municipal solid waste $5$ days per week at a density of $500l\frac{b}{y}{d}^3.$ If the solid waste is compacted to $1000l\frac{b}{y}{d}^3$ and the average depth of each cell is $10$ feet, estimate the expected life of the landfill in years if $25$ acres of space are still available $(1$ acre $=43,560f{t}^2).$ Draw a matevalem diagram to solve the problem.

A building is located $12$ ft from the centerline of the inside lane of a curved section of highway whose radius is $450$ ft $.$ The road is level and the embankment, e$,$ is $0\mathrm{.}10.$ Determine the posted speed limit $($to the nearest $5m\frac{i}{h})$ considering the following conditions: $(1)$ stopping sight distance and $(2)$ friction$/$curve radii. Assume the coefficient of side friction, fs $,$ is $0\mathrm{.}12.$