!Adam has joined a book club. The membership has an initial fee of $25.00 and each book rental costs $2.00.

This table shows the linear relationship between the total cost, y, and the number of books Adam rents, x.

Fill in each box to correctly model the relationship between x and y.
Number of books rented, x 3 ? 6 12 15

Total Cost, y $31.00 $? $43.00 $? $55.00