Respuesta :

Answer:

X+4

Step-by-step explanation:

Length is 4 more than width.

X+4= length

First box is 8

Second box is 13

Third box is 20

Answer:

14.

Length:

4+4= 8

9+4= 13

Width:

24-4= 20

Expression:

W=L-4

L=W+4