Answer :
Given:
The initial number of books in the shelf is, i = 6.
The final numbe of books in the shelf i, f = 15.
Kyle says 9 books were added in the shelf.
The objective is to find whether the answer is true or false.
Explanation:
To find the number of books added on the shelf,
[tex]\begin{gathered} x=f-i \\ =15-6 \\ =9 \end{gathered}[/tex]Thus, it is correct that the number of boooks added on the shelf is 9.
Hence, it is possible to agree with kyle.