The words "at most" mean less than or equal to, which sets up an inequality using the symbol ≤.
Price of 2 books + sticker book≤$14.00.
2(4.50) + x ≤ 14.00
9 + x ≤ 14
x≤5
At most, Dylan can spend $5.00 on a sticker book.
Hope I helped, have a great day!
~ Enstanding