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marcus is putting a border of mulch around a tree. the figure shows the top veiw of the mulch. the mulch is 3 in deep. find the volume of the mulch. (last problem shown in image.

The volume of the mulch is

Step-by-step explanation:

we know that

The volume of the mulch is equal to

where

B is the area of the border of the mulch

h is the deep of the mulch

Find the area of the border B

The area of the border B is equal to the area of the complete square minus the area of the inside square

so

we have

-----> the deep of the mulch

substitute the values