Answer:
m-9
Step-by-step explanation:
m represents how much cards he used to have he gave away 9 so u subtract
15.
I had x before the movie.
x - 13.50 = 26.50
Add 13.50 to both sides of the equation:
x = 40
I had $40 before the movie.
16.
The original balance was x.
x - 161.15 = 423.28
Add 161.15 to both sides:
x = 584.43
The previous balance was $584.43
17+30=47
47=47
That is the associative property of addition
