Here it is given that the width is x ft and total length of the fence is 2400 ft .
Let the length be y ft
So we have

Let A represents area, and area is the product of length and width .
So we get

Substituting the value of y, we will get

Second part
The area is maximum at the vertex, and vertex is

And

And that's the required dimensions .
Answer: B
Step-by-step explanation: The domain are all x values, meaning only the x values are counted for the domain.
The answer is 5(n+7)=40... l hope it helped
Answer:
x=1
Step-by-step explanation:
6x•9=5x+9
x•9=9