Question

I need with this question please help and please explain.

Answer 1

Step 2 is wrong.
Should be
2: (-2 + 5) (20) + (-3) (25) + (4x2) (25)
3: (-2 + 5) (20) + (-3 + 8) (25)
4: (3) (20) + (5) (25)
5: 60 + 125
6: 185