Posted by **keisha** on Friday, November 23, 2007 at 8:49pm.

Marcus has 68 ftof fencing. He wants to build a rectangular pen with the largest possible area. What should the dimensions of the rectangle be?

a. 19 ft by 21 ft

b. 21 ft by 13 ft

c. 17 ft by 17 ft

d. 19 ft by 15 ft

I got a because I multiplied 19 x 21 and I got 399. Is this right?

- math -
**Michael**, Friday, November 23, 2007 at 8:53pm
First, you have to check to make sure you have sufficient fencing. Take each of the four options and calculate the perimeter to make sure you have no more than 68 ft.

For the first one, the perimeter would be 19+19+21+21 or 19(2) + 21(2), both of which equal 80. You don't have enough fencing for that, so eliminate the option.

Then, with your remaining options, calculate the area by multiplying the sides as you did above to see which is largest.

- math -
**keisha**, Friday, November 23, 2007 at 8:57pm
Is it c. 17 by 17?

- math -
**Writeacher**, Friday, November 23, 2007 at 9:01pm
Yes, that's right.

17 + 17 + 17 + 17 = 68

or

17(4) = 68

## Answer This Question

## Related Questions

- math - Marcus has 68 ft of fencing. He wants to build a rectangular pen with the...
- algebra - Marcus has 72 feet of fencing. He wants to build a rectangular pen ...
- Math please help - A farmer has 120 feet of fencing available to build a ...
- Math - The first question is this: Helen designs a rectangle with an area of 225...
- algebra - Ian wants to build a rectangular pen for his animals. One side of the ...
- math - Trent wants to build a rectangular pen for his animals. One side of the ...
- math - Suppose you want to build an outdoor rectangular pen enclosed by fencing ...
- Pre-Calc - A farmer is making a pig pen next to the barn. He has enough ...
- Math - Manuel wants to build a rectangular pen for his animals. One side of the ...
- math - a farmer has enough fencing to build 40 feet of fence. He wishes to build...

More Related Questions