Posted by peyton on Friday, March 25, 2011 at 7:44pm.
Mr. Smart just bought a new dog named Fluffy. Mr Smart would like to enclose a play space for Fluffy in his back yard. The 5 side play space has the dimensions, in metres. They are x +11, 2x4,3x.
Write a simplified expression for the number of metres of fencing needed to enclose this space. Would this be correct
5 (x+11) + (2x4) +(3x)
Determine the amount of fencing Mr. Smart will need to enclose the space if x= 7m?
Would this be correct
5(x+11) + (2x4) + (3x)
5x +55 +10x 20 +15x
(5x+10X+15x) + (5520)
= 30x + 35
Do these answers seem right! Please help!! Thanks

grade nine math Polynomials  Reiny, Friday, March 25, 2011 at 7:56pm
I am confused by your solution.
In the opening part you state that the enclosure is 5 sided, but then you give only 3 dimensions.
in your expression you have 5 of the x+11, then you are adding the other two.
That would make it 7sided, wouln't it?
Is there something missing in the first part?

grade nine math Polynomials  peyton, Friday, March 25, 2011 at 8:00pm
Sorry I should of stated that the 5 sided enclosure only gave 3 dimensions that's why I multiplied by 5. This is why I was unsure.

grade nine math Polynomials  Reiny, Friday, March 25, 2011 at 8:20pm
In that case neither the question nor your solution make any sense.
According to your algebraic expression, you have 7 sides.

grade nine math Polynomials  peyton, Friday, March 25, 2011 at 8:23pm
it was a 5 sided pentagon but the problem only gave me 3 dimensions.

grade nine math Polynomials  Reiny, Friday, March 25, 2011 at 8:27pm
As i said, the problem makes no sense, and cannot be solved as it stands.

grade nine math Polynomials  peyton, Friday, March 25, 2011 at 8:32pm
alright? so do you think i should question my own teacher?

grade nine math Polynomials  Ms. Sue, Friday, March 25, 2011 at 8:47pm
Of course! How else do you learn but by asking questions?
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