Final answer:
The pattern of rectangles made of small squares can be described using the expression n × (n+1) to find the number of squares in step n.
Step-by-step explanation:
- Step 1: 2 squares
- Step 2: 6 squares (3 across and 2 down)
- Step 3: 12 squares (4 across and 3 down)
- To find the pattern, observe that the number of squares in each step is the product of the number of squares across and the number of squares down.
- Therefore, the expression that gives the number of squares in step n is n × (n+1).