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To prove that the sum \( t = r + 8 \) is irrational if \( r \) is rational and 8 is rational, the correct sequence of steps is:
1. **Step 2:** For a contradiction, assume that \( t \) is rational, and write \( r \) and \( t \) as fractions.
2. **Step 4:** Find a common denominator.
3. **Step 1:** Subtract, writing \( s \) as a fraction.
4. **Step 3:** Realize a contradiction.
So, the correct answer is:
• Step 2, Step 4, Step 1, Step 3