If `t=s-3`, what is `s+t`?

Answer

To solve the problem where \( t = s - 3 \) and we need to find \( s + t \), we can follow these steps:

### Step 1: Substitute the value of \( t \)
We know that \( t = s - 3 \). We can substitute this value into the expression \( s + t \).

\[ s + t = s + (s - 3) \]

### Step 2: Simplify the expression
Now, we simplify the expression we obtained in Step 1.

\[ s + t = s + s - 3 = 2s - 3 \]

### Step 3: Conclusion
The expression \( s + t \) simplifies to \( 2s - 3 \). This is the final answer, but we can analyze it further based on the parity (odd/even nature) of \( s \).