13. 4w", 3w, -5, 146,
-2017
3x + xy - 5
x + 4XY +
ot
х
D. Simplify the following.
16. -5- 5k + 8m - 4m + 2k
19.
y
2
20.
5
у
2 3
bt C С
3
5.
btc
2
+
17, áp +7p 9 + 12P + 9P
18. -7ab' + 14 ob? - 3b'& + 8ab? + Bob's​