Reinout the -4 and 8 do not count as it says "between " !
so between -4 and 8 we have :
$$-3,-2,-1,0,1,2,3,4,5,6,7$$
so if we count these integers we have 11 intergers between -4 and 8 !
so i hope uve understood how we found out these intergers !if not then pls ask !