The problem asks to find and simplify the expression $(f + g)(-1)$, given the following functions:

• $f(x) = x - 1$
• $g(x) = x^2 - x$

We are tasked to evaluate $(f + g)(-1)$.

Steps to solve:

1. Find $f(-1)$: $f(x) = x - 1 \implies f(-1) = -1 - 1 = -2$

2. Find $g(-1)$: $g(x) = x^2 - x \implies g(-1) = (-1)^2 - (-1) = 1 + 1 = 2$

3. Sum the results: $(f + g)(-1) = f(-1) + g(-1) = -2 + 2 = 0$

Thus, $(f + g)(-1) = 0$.

Let me know if you'd like more details or have further questions!

Here are five related questions you can try:

1. What is $(f \cdot g)(-1)$ for the same functions?
2. Evaluate $(f + g)(0)$ for the given functions.
3. How would you simplify $(f - g)(1)$?
4. What is the derivative of $f(x) + g(x)$?
5. Evaluate $(f \cdot g)(2)$ and simplify.

Tip: Always remember to substitute correctly and carefully simplify when adding functions.