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AmberK
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For question 6 the volume of the sidewalk would be given by\[V=l \times w \times d\] l=580 ft w=9 1/2 ft=9.5 ft d=6 in=0.5 ft Once you have your volume in cubic feet, you have to convert to cubic yds
1 cubic yard = 1 yd x 1 yd x 1 yd = 3 ft x 3 ft x 3 ft
For question 11, you need to find the average number of people per sq mi in the US=total number of people in the US divided by the total area of the US in sq mi