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December 20, 2014

December 20, 2014

Posted by **val** on Monday, April 19, 2010 at 8:02pm.

- 4th grade math -
**Ms. Sue**, Monday, April 19, 2010 at 8:13pmAre you sure you copied this problem correctly?

A rug with a perimeter of 17 cm wouldn't be large enough to hold my big toe.

- 4th grade math -
**val**, Monday, April 19, 2010 at 8:17pmthis is copied correctly. the teacher wanted to keep it simple

- 4th grade math -
**Reiny**, Monday, April 19, 2010 at 8:46pmYour teacher should have stated that the area is 13 cm^2.

If your teacher tried to make it simple, then he/she did not do such a good job.

I did it by algebra and it led to a quadratic equation.

length - x

width - y

2x + 2y = 17

x + y = 8.5

also xy = 13, so y = 13/x

x + 13/x = 8.5

x^2 - 8.5x + 13 = 0

2x^2 - 17x + 26 = 0

(x-2)(2x - 13) = 0

x = 2 or x = 6.5

if x = 2 , then y = 6.5

if x = 6.5, then y = 2

so the "rug" is 2 cm by 6.5 cm, and as Ms Sue noted, probably just big enough to fit into a doll house.

I have a 4th grade "guess" at that answer is rather stretching it.

- 4th grade math -
**Benjamin**, Wednesday, February 2, 2011 at 7:55pmThat is not 4th grade homework

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