Example 3
Evaluate each expression if w = -5, x = 8, y = 2, and z = -4.
12. 15w+x|-7
13. z+ 14x-yl
15. 16-z-2x
18. 20-13y + 2w|
16. 6y-|w+5z|
19. |6x|-3z
14. 15z-2x +8w
17. |x+y|-z
20. |7y-2w| +xz|
