1 answer
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1. The property used to arrive at Step one is the **Distributive Property**. The student distributed the 2 into the expression \( (x + 1) \) in the equation \( 2(x + 1) \) to get \( 2x + 2 \).
2. The mistake made from the previous step appears in **Step four**. The student incorrectly solved for \( x \). After correctly simplifying to \( 3x = 15 \), they made an arithmetic error when dividing by 3.
3. The correct answer for \( x \) should be \( x = 5 \) (since \( 3x = 15 \) leads to \( x = 15 / 3 = 5 \)).