OpenStudy (anonymous):

HELP PLEASE. Barry had a rectangular farm with dimensions x feet and 20 feet. He put a fence along 30 feet of the boundary of the farm. An expression is shown below: (2x + 40) - 30 Part A: What does the expression represent? (4 points) Part B: What does 2x + 40 represent? (3 points) Part C: What does 2x represent? (3 points)

3 years ago
OpenStudy (anonymous):

its to complicated

3 years ago
OpenStudy (anonymous):

I know :/

3 years ago
OpenStudy (anonymous):

@jdoe0001 @myininaya

3 years ago
OpenStudy (anonymous):

@phi

3 years ago
OpenStudy (anonymous):

@Preetha

3 years ago
OpenStudy (phi):

*** Barry had a rectangular farm with dimensions x feet and 20 feet. *** First step: Collect your thoughts... you could write down all you know about a rectangle with sides of 20 feet and x feet. what can you write down ?

3 years ago
OpenStudy (anonymous):

not very much i think.. :/

3 years ago
OpenStudy (phi):

anything at all? No notes about rectangles ?

3 years ago
OpenStudy (anonymous):

I know rectangles have four sides to them..

3 years ago
OpenStudy (anonymous):

if that's any help

3 years ago
OpenStudy (phi):

that is a good start. any formulas ?

3 years ago
OpenStudy (anonymous):

area = l*w

3 years ago
OpenStudy (phi):

which, for this rectangle, would mean area=20x any other formulas ?

3 years ago
OpenStudy (anonymous):

volume equals l*w*h

3 years ago
OpenStudy (phi):

rectangles are flat (2 dimensions) and don't have volume. What about perimeter?

3 years ago
OpenStudy (anonymous):

You add up all the numbers for perimeter

3 years ago
OpenStudy (phi):

what would the perimeter of this rectangle be ?

3 years ago
OpenStudy (anonymous):

20+20+2x or 40+2x

3 years ago
OpenStudy (phi):

does that look familiar ? (see question)

3 years ago
OpenStudy (anonymous):

Part B? :)

3 years ago
OpenStudy (phi):

For Part A. notice this: He put a fence along 30 feet of the boundary of the farm. we have (2x + 40) - 30 perimeter minus 30 feet. Any idea what that represents ?

3 years ago
OpenStudy (anonymous):

what you just said... perimeter minus 30 feet

3 years ago
OpenStudy (phi):

Yes, but I think they want you to make one more deduction... If he put up 30 feet of fence on the boundary, how much of the boundary does *not* have a fence?

3 years ago
OpenStudy (anonymous):

hmm.. 10?

3 years ago
OpenStudy (anonymous):

10ft

3 years ago
OpenStudy (phi):

the length of the "boundary" is the perimeter.

3 years ago
OpenStudy (anonymous):

so what does that mean?

3 years ago
OpenStudy (phi):

How much of the boundary does not have a fence?

3 years ago
OpenStudy (anonymous):

I don't think I know that

3 years ago
OpenStudy (phi):

Don't you think it would be the length of the boundary (i.e. the perimeter) minus the amount of fence put up ?

3 years ago
OpenStudy (anonymous):

that makes alot more sense

3 years ago
OpenStudy (phi):

A would be the length of "unfenced perimeter"

3 years ago
OpenStudy (anonymous):

Yes! thank you alot... do you think you can look at this question for me? if you don't get it you can just tell me

3 years ago
OpenStudy (phi):

Did you answer part C ?

3 years ago
OpenStudy (anonymous):

yes

3 years ago
OpenStudy (anonymous):

the two sides that are representing x

3 years ago
OpenStudy (anonymous):

or x is representing i should say

3 years ago
OpenStudy (phi):

2x is the length of the two opposite sides each of length x

3 years ago
OpenStudy (anonymous):

okay

3 years ago
OpenStudy (anonymous):

do you mind looking at the equation for me?

3 years ago
OpenStudy (phi):

can you make it a new post, please?

3 years ago
OpenStudy (anonymous):

yes.

3 years ago