29. 20r + 17r - 21r =
30.5 + 6j - 7 + 8j =
C. Add and subtract the polynomials by applying the rules.
26. 3x + 9x + 2xy + 7y + 3xy
27. (2a + 3b) - (5b - 6a)
28. 4a -95 + 12c =
![29 20r 17r 21r 305 6j 7 8j C Add And Subtract The Polynomials By Applying The Rules26 3x 9x 2xy 7y 3xy27 2a 3b 5b 6a28 4a 95 12c class=](https://ph-static.z-dn.net/files/dac/2c0a07789b205c0e1bd75834c195081d.jpg)