Math Problem Statement

A child makes a tower by stacking blocks on top of one another. Each block is a rectangular prism with a length of 2x inches, a width of x inches, and a height of (x - 1) inches. If x > 1, and the child stacks a total of 12 blocks on top of one another before the tower tips over, which equation represents the volume of the tower, V, in cubic inches?

Solution

The problem involves finding the total volume VV of a tower made by stacking 12 identical rectangular blocks. Each block has:

  • Length: 2x2x inches
  • Width: xx inches
  • Height: (x1)(x - 1) inches

The volume of one block is given by:
Volume of one block=Length×Width×Height=(2x)(x)(x1)=2x2(x1)\text{Volume of one block} = \text{Length} \times \text{Width} \times \text{Height} = (2x)(x)(x - 1) = 2x^2(x - 1)

Since there are 12 blocks, the total volume VV of the tower is: V=12×Volume of one block=12×2x2(x1)V = 12 \times \text{Volume of one block} = 12 \times 2x^2(x - 1)

Simplify: V=24x2(x1)V = 24x^2(x - 1)

Thus, the correct equation representing the volume of the tower is: V=24x2(x1)\boxed{V = 24x^2(x - 1)}

Let me know if you'd like further explanation!


Relative Questions:

  1. How is the volume of a rectangular prism calculated?
  2. Why is the volume of the block multiplied by 12 to get the total volume?
  3. How would the formula change if the number of blocks were different?
  4. Can the height of the block, x1x - 1, affect the tipping point of the tower?
  5. What would happen to the volume if xx were smaller than or equal to 1?

Tip:

Always double-check the dimensions (length, width, height) before calculating the volume of a prism to avoid mixing up the terms.

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Math Problem Analysis

Mathematical Concepts

Volume of a rectangular prism
Multiplication of polynomials

Formulas

Volume of a rectangular prism = Length × Width × Height
V = 12 × Volume of one block

Theorems

Distributive property of multiplication over addition

Suitable Grade Level

Grades 8-10