The answer is 3 cm. You just have to add the sides you know (6 and 8) and subtract that from the perimeter (18)
Xis less than or equal to 3
Cubs to female bear; 3/1 = 3
answer
3
In order to solve a proportion you need to cross multiply, so you would do:
4x20 and 9xX and you would get...
9x=80
then divide by nine to get
x=8.8888888889
which is technically 8.9
