Final answer:
To add the expressions (-t +) and (-3-s + 2t), combine the like terms to get t-3-s.
Step-by-step explanation:
To add the expressions (-t +) and (-3-s + 2t), you need to combine the like terms. Start by combining the terms that contain t. The first expression has -t and the second expression has 2t, so when you add them together, you get -t + 2t = t. Next, combine the terms that don't contain t. The first expression has no other terms, and the second expression has -3 and -s. When you add them together, you get -3 - s. Putting it all together, the simplified expression is t + (-3 - s), which can also be written as t - 3 - s.
Learn more about Combining like terms in algebra