The figure shows a solid built with 1-cm unit cubes. The arrangement has 2 columns and 2 rows: the front-left stack is 3 cubes tall, front-right is 2 cubes tall, back-left is 1 cube tall and back-right is 2 cubes tall. How many unit cubes are used in total?
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Worked Solution
Step 1: Identify the height of each stack from the diagram.
Front-left: 3 cubes
Front-right: 2 cubes
Back-left: 1 cube
Back-right: 2 cubes
Step 2: Add the number of cubes in every stack.
Total = 3 + 2 + 1 + 2
Step 3: Compute the sum.
3 + 2 = 5
5 + 1 = 6
6 + 2 = 8
Final answer: 8 unit cubes
Answer: 8
Correct answer: 8
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