grade nine math Polynomials
posted by peyton on .
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

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? 
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.

In that case neither the question nor your solution make any sense.
According to your algebraic expression, you have 7 sides. 
it was a 5 sided pentagon but the problem only gave me 3 dimensions.

As i said, the problem makes no sense, and cannot be solved as it stands.

alright? so do you think i should question my own teacher?

Of course! How else do you learn but by asking questions?