| Linus has 100 ft of fencing to
use in order to enclose a 1200
square foot rectangular pig pen.
The pig pen is adjacent to a
barn so he only needs to form
three sides.
I can determine the
dimensions of the fence,
showing my steps.

or

Step-by-step explanation:

We are given that

Total fencing used=100 ft

Area enclosed=1200 square ft

Let length of rectangular pig pen=x

Breadth of rectangular pig pen=y

Fencing used=2x+y

Area of rectangular pig pen=

When x=20ft

ft

When x=30 ft

ft

Dimension of fence is give  by

or

answer: #1 ads up by 8 and i don't know #2