Question

10. By how much is 7a - 8b + 9c greater than 8a - 9b + 4c?​

Answer 1

Answer:

a-17b+13C

Step-by-step explanation:

Hope this answers helps you

Answer 2

Step-by-step explanation:

7a - 8b + 9c - ( 8a - 9b + 4c)

= 7a - 8b + 9c - 8a + 9b - 4c

= 7a - 8a -8b + 9b +9c - 4c

= - a + b + 5c

so greater by - a+b+5c.

regards i hope u will understand...