Answer:
6.2 cm
Step-by-step explanation:

The height of the box is 6.2 cm.
A Multiply the input number by 6 because 2 times 6= 12, 6 times 6= 36, 8 times 6= 48, 9 times 6= 54, and 12 times 6= 72.
Answer:
The maximum area is 
Step-by-step explanation:
Let
x----> the length of rectangle
y---> the width of rectangle
we know that
The perimeter of rectangle is equal to

we have

so


------> equation A
Remember that
The area of rectangle is equal to
-----> equation B
substitute equation A in equation B

This is a vertical parabola open downward
The vertex is a maximum
The y-coordinate of the vertex of the graph is the maximum area of the garden and the x-coordinate is the length for the maximum area
using a graphing tool
The vertex is the point 
see the attached figure
Find the value of y
-----> 
The dimensions of the rectangular garden is
by 
For a maximum area the garden is a square
The maximum area is 