If the pattern shown below continues, how
many dots will appear in the $7^{th}$ figure?
31 dots
35 dots
55 dots
71 dots

Answer

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Answer

Plug $n = 7$ into the equation to find the number of dots in the $7^{th}$ figure.

Steps

Step 1 ：Analyze the pattern and find the relationship between the figure number and the number of dots.

Step 2 ：Identify the equation representing the relationship.

Step 3 ：Plug $n = 7$ into the equation to find the number of dots in the $7^{th}$ figure.