A cube with side length 5 h squared is stacked on another cube with side length 3 k What is the total volume of the cubes in factored form?

The volume of a cube is its side length cubed, so the total volume is (5h²)³ + (3k)³. This is a sum of cubes: use a³ + b³ = (a + b)(a² − ab + b²), with a = 5h² and b = 3k. The factored result is (5h² + 3k)(25h⁴ − 15h²k + 9k²), which is choice A.

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