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anonymous
 one year ago
The following table shows the length and width of two rectangles:
Length Width
Rectangle A x + 8 x − 1
Rectangle B 4x + 5 3x − 2
Which expression is the result of the perimeter of rectangle B minus the perimeter of rectangle A?
10x − 12
18x + 32
10x − 8
18x + 6
anonymous
 one year ago
The following table shows the length and width of two rectangles: Length Width Rectangle A x + 8 x − 1 Rectangle B 4x + 5 3x − 2 Which expression is the result of the perimeter of rectangle B minus the perimeter of rectangle A? 10x − 12 18x + 32 10x − 8 18x + 6

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can someone help me on this?? i dont understand it

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2Yikes! A little scary, huh? Not to worry though, it's actually pretty easy. Let's take it one step at a time.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2The question sounds very confusing, "the perimeter of rectangle B minus the perimeter of rectangle A"... uh.. yeah. Let's just ignore that for now and think about the perimeters separately: Perimeter of rectangle A is (we will find out) and Perimeter of rectangle B is (again, we will find that out).

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2So, what do we know about rectangle A? The table says that A's length is x + 8 (some number) and the width is x  1 (some other number). Let's draw a picture so we can see what this even means.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2dw:1436922996057:dw

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2Alright, does that picture make sense so far?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2OK, perfect! We are almost done with the hardest part. Do you remember how to find the perimeter?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you time it by each side ??

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2Close, that's the area (they often get confused). :)

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2It's actually easier... we just add all four sides together and measure the outside of the rectangle.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2(x+8) + (x1) + (x+8) + (x1) = 4x + 16  2 = 4x + 14. There that's better.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2So that is the perimeter of A. Any questions on how we did that part?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2OK. Now, we just do exactly the same thing for rectangle B.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2We have different numbers: B width = 3x  2 B length = 4x + 5

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2dw:1436923340928:dw

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2And, then we just add all four sides... it's a little messy, but try it and see what you get. I'll check your answer. :)

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2sure thing. take your time. :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.04x+5+3x2+4x+5+3x2= 14x+6

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2Alright, so now we know that: Perimeter of A = 4x + 14 Perimeter of B = 14x + 6.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so subtract 14x+6 4x+14

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2Good, but be careful with your parentheses. We want the whole perimeter of A to be subtracted so we need (14x + 6)  (4x + 14) in order to get the right answer.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0YAYYY THANKYOU SO MUCH :))

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.2You're welcome! Good job!
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