Final answer:
The x-coordinate of Q' after reflecting Q(-2, 5) over y = -x + 4 is 2.
Step-by-step explanation:
To find the x-coordinate of Q' after reflecting Q(-2, 5) over the line y = -x + 4, we can use the concept of reflection. The x-coordinate of Q' will be the same as the x-coordinate of Q, but with the opposite sign. So, the x-coordinate of Q' is -(-2) = 2.