Question 649659
Think of this as a proportion. Let x be the unknown length.

{{{(8 width inches)/(13 length inches) = (11 width inches)/x}}}

Cross multiply.

8x = 11*13

8x = 143

x = 17.875 inches

Hopes this helps!

-Devin

---------------------

DON'T FORGET TO LEAVE A THANK YOU NOTE TO EXPRESS FEEDBACK!

If you have any further questions contact onlyyourmathtutor@yahoo.com.