Answer:
4<x<20
Step-by-step explanation:
the missing side must be between these two values because it is the difference of 8 and 12 and the sum of 8 and 12. we do this calculate because to make a triangle, any two sides must add up to be greater than the third side. so it can't be 4 because 8+4= 12 and the sides can't be equal (must be greater) and it can't be 20 because 8+12 = 20 and they can't be equal. so it must be anywhere between 4 and 20.
