Answer:
Karen needs to spend $4.5 to buy new hair bands.
Step-by-step explanation:
Given:
Hair bands Karen have = 3
cost of 8 hair bands = $1
Total Hair bands she require = 39
Hence Number of of new hair bands require = Total Hair bands she require - Hair bands Karen have = 39 -3 = 36
we need to find how much money she need to spend to buy new hair bands.
cost of 8 hair bands = $1
Cost of 36 hair bands = money need to spend on hair bands
By using Unitary method we get;
Money spend on new hair bands = 
Hence,Karen needs to spend $4.5 to buy new hair bands.
Ending position (in order)
+ 4
+ 3
+ 7
+ 3
0
+ 3
- 2
- 1
+ 6
- 7
Hope this helps :)
I good accumulator to use would be symbolab.com
The answer would be 3072/5629
7 - 2 = 5
5 / 5 = 1
The answer would be 1.