Answer:
16
Step-by-step explanation:
A square has same length on all sides.
So, 18x-20=42-13x
18x+13x=42+20
31x=62
x=62/31=2
Now you can substitute x=2 in one of the equations to find the length of the side.
18x-20 = (18*2)-20 = 36-20 = 16
Answer:
8
Step-by-step explanation:
Simplify the expression.
Answer to both is “ 1 “ !
(fourth term) = (third term) + (common difference)
fourth term = 7 + (-5)
fourth term = 2