The answer to your question is -16/3
<h3>The base area of box 1 is

</h3>
<em><u>Solution:</u></em>
Given that,
The dimensions of the base of Box 1 are x by 3x
Length = x
Width = 3x
To find: base area of box 1
<em><u>The base area is given as:</u></em>

Thus base area of box 1 is 
Answer:
87.96yd
Step-by-step explanation:
C=2πr=2·π·14≈87.96459yd
He has seven models because 21 divided by 3 is seven