Final answer:
The expression equivalent to s - t is s + (-t).
Step-by-step explanation:
The expression equivalent to s - t is s + (-t).
In this expression, the negative sign in front of t indicates subtraction. So, when we subtract t from s, we can rewrite it as s + (-t).
For example, if s = 10 and t = 3, then s - t = 10 - 3 = 7. Similarly, s + (-t) = 10 + (-3) = 7. So, both expressions are equivalent.