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Hi,
The volume of a rectangular box is limited to 1100 in^3
 height is 8 inches and the width is 10 inches 
how long can the box be?
Let x reprsent that length
V(rectangular box) = l*w*h
Question states***
 x*10in*8in = 1100in^3
   x = 1100in^3/80in^2
   x = 13.75in, the length
CHECKING our Answer*** 
 13.75in*10in*8in = 1100in^3