Final answer:
To add the expressions (-4t + 5s) and (-3 - 7s + 2t), you combine like terms to get -2t - 2s - 3 as the final expression.
Step-by-step explanation:
To add the expressions (-4t + 5s) and (-3 - 7s + 2t), we combine like terms. The like terms here are those with the same variable and the constants.
- Combine the terms with 't': -4t + 2t = -2t.
- Combine the terms with 's': 5s - 7s = -2s.
- Combine the constants: -3 (since there are no other constants to combine with).
The resultant expression after combining like terms is -2t - 2s - 3.