Answer:
4 cm and 7 cm
Step-by-step explanation:
Given that Juanita is cutting a piece of construction paper in the shape of a parallelogram. Two opposite sides of the parallelogram have lengths (5n − 6) cm and (3n − 2) cm.
We know that opposite sides are equal in a parallelogram.
Hence we have

Hence the side length = 
The adjacent side = 
Thus answer is 4 cm and 7 cm
h= 0
Substitute 3 in the equation
h = {2(3) + 1 }/3-3
h = 7/0
h = 0
Therefore h is 0