D. because for every hour it goes down 5 degrees and since there is a 1 hour gap in between 7 am and 9 am
Length of a carton :

Width of the carton :

Height of the carton :

Volume of the carton :
= Length × Width × Height



Therefore, the volume of the carton = 21.85 feet.
I hope this helps you
m (I)= m (P)
3x+4=72-x
4x=68
x= 17