Question

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)

Answer 1

its to complicated

Answer 2

I know :/

Answer 3

@jdoe0001 @myininaya

Answer 4

@phi

Answer 5

@Preetha

Answer 6

*** 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 ?

Answer 7

not very much i think.. :/

Answer 8

anything at all? No notes about rectangles ?

Answer 9

I know rectangles have four sides to them..

Answer 10

if that's any help

Answer 11

that is a good start. any formulas ?

Answer 12

area = l*w

Answer 13

which, for this rectangle, would mean area=20x

any other formulas ?

Answer 14

volume equals l*w*h

Answer 15

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

Answer 16

You add up all the numbers for perimeter

Answer 17

what would the perimeter of this rectangle be ?

Answer 18

20+20+2x or 40+2x

Answer 19

does that look familiar ? (see question)

Answer 20

Part B? :)

Answer 21

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 ?

Answer 22

what you just said... perimeter minus 30 feet

Answer 23

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?

Answer 24

hmm.. 10?

Answer 25

10ft

Answer 26

the length of the "boundary" is the perimeter.

Answer 27

so what does that mean?

Answer 28

How much of the boundary does not have a fence?

Answer 29

I don't think I know that

Answer 30

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

Answer 31

that makes alot more sense

Answer 32

A would be the length of "unfenced perimeter"

Answer 33

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

Answer 34

Did you answer part C ?

Answer 35

yes

Answer 36

the two sides that are representing x

Answer 37

or x is representing i should say

Answer 38

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

Answer 39

okay

Answer 40

do you mind looking at the equation for me?

Answer 41

can you make it a new post, please?

Answer 42

yes.