Farmer fernanda wants to put a fence around her rectangle field . the length of the field is 40 feet less than 3 times the width. if she has 320 feet of fencing, what are the dimensions of the field?

Length: 110 feet

Width: 50 feet

Step-by-step explanation:

we know that

The perimeter of rectangle is equal to

where

L is the length of rectangle

W is the width of rectangle

we have

so

----> equation A

----> equation B

Solve the system by substitution

substitute equation B in equation A

solve for W

Find the value of L

therefore

The dimensions of the field are

Length: 110 feet

Width: 50 feet

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.