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11. 28*21 = 588 cubic feet

12. 16*9/3 = 48 pi ~150.72 ~ 151 cubic inches

13. 9*9*14/3 =  378 cubic yards

11. 28*21 = 588 cubic feet

12. 16*9/3 = 48 pi ~150.72 ~ 151 cubic inches

13. 9*9*14/3 = 378 cubic yards

Step-by-step explanation:

From the start of the trail to the lookout point, the distance is given to be equal to 8 3/4 miles. Then, we determine the distance she covered from lookout point to Giant boulder by determining the difference between the distances. 
                                  8 3/4 miles - 4 1/4 miles = 4.5 miles or 4 1/2 miles
To calculate the total distance covered, we just have to add up 8 3/4 miles and 4 1/2 miles. This will give us the answer of 53/4 miles or 13.25 miles.