Ok, lets start with the top.
7/8 + (-2/3)
Thats equal to
7/8 - 2/3
The common denominator will be 24
21/24 - 16/24
Subtract
5/24
Now, to divide you multiply by the reciprocal, so
5/24 / 5/6
Becomes
5/24 * 6/5
Cross simplify and get your answer
1/4
the graph would steeper, meaning more savings over time
Just write any number less than 5/4
35 songs/7 songs= 5 CDs
5-3=2 CDs left after they sold 3
5 hours because 5x6 = 30 +20 =50
