Respuesta :

1=7 3=21 5=35 7=49 13=91 hope this helps :)

Answer:

first box= 7 sec= 21 third=35 fourth=7 fifth=91

Step-by-step explanation

since the first 4 boxes are adding by 2s, ima add 2 too.

then that unknown box will be 7.

7x7=49

Therefore multiply every other by 7.