I need help on number 10 please the reason why thEre is a number is because I got the answer from going over it I just need to know how to do it

Question:
Solution:
Consider the following equation:
[tex]P\text{ = 2(l+w)}[/tex]if l = 14 ft and w= 9ft and if we replace these values into the previous equation, we get:
[tex]P\text{ = 2(14+9) = 2(23) = 46}[/tex]we can conclude that the correct answer is:
[tex]P\text{ = 46 ft}[/tex]