The possible additional amounts she will spend is less than 12
Solution:
Given that,
Kaitlin will spend less than $29 on gifts
So far, she has spent $17
Let "x" be the remaining amount she will spend
From given,
Remaining amount she can spend will be less than 29 - 17
Therefore,
[tex]Remaining\ amount\ she\ will\ spend < 29-17\\\\x<29-17\\\\x<12[/tex]
Thus the possible additional amounts she will spend is less than 12