Abbey wants to use her savings of $1,325 to learn yoga. the total charges to learn yoga include a fixed registration fee of $35 and a monthly fee of $50. what is the maximum number of months for which abbey can learn yoga with her savings?

The first thing we are going to do for this case is define variables.
 We have then:
 x: number of months
 y: total cost
 We now write the linear function that models the problem:
 
 The maximum number of months occurs when savings are reached.
 Therefore, substituting y = 1325 we have:
 
 From here, we clear x:
 
 Rounding the nearest whole before the next number:
 
 
 The maximum number of months for which Abbey can learn yoga with her savings is:
 

What mathematical statement is missing ? ? the answer is b