9a-b-2a-10b
A. -7a+11b
B. 11a+9b
C. -11a-9b
D. 7a-11b
I think it’s either c or d
Please help with an explanation, thank you!
9a-b-2a-10b
"combine" like terms:
9a - 2a = 7a
just like 9-2 = 7
you have 9 apples, and take away 2 of them, you have 7 apples left
-b - 11b = -11b
-1 - 10 = -11
you owe your mom 1 dollar from last week and this week you owe her 10 dollars, so now you owe her 11 dollars (owe - )