The appicable formula is
... V = (1/3)Bh
where B is the area of the base, and h is the height.
Substituting the given information, you have the volume ...
... V = (1/3)·(7.4 units²)·(6 units) = 14.8 units³
He will have 7.75 left from the 20 dollar bill he spent
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Rise over run: I counted 3 units up and then 2 times to the right which makes the slope 3/2.
$128 is the answer.
The carton has a volume of 512 square inches because since it is a cube 8 inches tall, that is also the length and width. Each plastic cube is 1 square inch, so 512 cubes will fit. All the cubes in total will cost $128 .