Taliba has $
31
to spend ordering some new phone cases.
Each phone case costs $
4
, and there is also a $
7
shipping charge.
How many phone cases, n
, can Taliba buy?
The cost of the phone cases is $4 per case and Taliba has $31 to spend. Therefore, she can buy 31/4 = 7.75 cases.
Since she cannot buy a fraction of a case, she can buy a maximum of 7 phone cases.