Posted by **Grace** on Tuesday, July 22, 2014 at 6:16am.

A rectangular field is to be fenced off with 120 m of fencing materials. the length of the field is x. express the area in square meters of the field as a function of x.

- SECONDARY ALGEBRA -
**Grace**, Tuesday, July 22, 2014 at 6:38am
f(x)=(120m^3)x

- SECONDARY ALGEBRA -
**Steve**, Tuesday, July 22, 2014 at 11:02am
nice try, but you're mixing things up. Why do you say 120 m^3? m^3 is volume, not are or length! And why multiply the perimeter by the length, anyway?

Just take a step back and work things out.

The area is length * width

The 120m of fencing reaches around the field -- that is the perimeter.

If the perimeter is 120, that means that

2(length+width)=120

length+width=60

So, if the length is x,

width = 60-x

That means that the area is

x(60-x)

and that is in m^2: meters * meters

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