The math problem is:
The length of a rectangle is 3 more than twice its width. The perimeter is 48 feet. Find the width.
This is how you solve it:
L = 2W + 3
P = 2L + 2W = 48
2(2W + 3) + 2W = 48
4W + 6 +2W = 48
6W + 6 = 48
6W = 42
W = 7
I'm a little confused when it comes to this part...
2(2W + 3) + 2W = 48
^ i don't understand where you get this 2 from?
can someone please clarify this to me for 10 points =)
Thnk you
Happy n healthy new year :]
2007-12-30 08:44:42 · 10 answers · asked by H0llywoodzZ Star (: 2 in Science & Mathematics ➔ Mathematics
W= width
L= Length
P= Perimeter
2007-12-30 08:49:07 · update #1
Glad to. Go back to the equation 2(2W+3) + 2W.
Here you (or they) are adding up 2 lengths plus 2 widths to get the perimeter of 48. One length is 2W+3 as previously defined. Two lengths would be 2(2W+3).
Add 2W to get the total perimeter of 48. Got it now?
2007-12-30 08:56:23 · answer #1 · answered by MVB 6 · 0⤊ 0⤋
rectangle length = 3 more than 2 times the width
L= 2W+3
P= 2L +2W= 48
the reason it is 2 is because you are substituting 2W+3 for L and to find the perimeter of a rectangle you have to mark with the set formula it is not L but 2*L=2L
2(2W+3)+2W=48
4W+6+2W=48
6W+6=48
6W+6-6=48-6
6W=42
W=7
2007-12-30 08:56:39 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
A rectangle has four sides.. 2 lengths and two widths hence the 2 before the (2w+3) and W
2007-12-30 12:42:24 · answer #3 · answered by youwinagain09 2 · 0⤊ 0⤋
another way to do it is --
2(2w+3 + w) = 48 => 3w+3 = 24 => 3w = 21 => w = 7
and length l = 2w+3 = 2*7+3 = 17
from
perimeter = l + w + l + w = 2(l + w) = 2(2w+3 + w) as
length = 2width + 3
2007-12-30 09:14:13 · answer #4 · answered by sv 7 · 0⤊ 0⤋
Because L=2W+3, in P=2L +2W=48 the "L" is being doubled, i.e. 2(L). So when you substitute 2W+3 for L you get 2(2W+3).
2007-12-30 09:45:06 · answer #5 · answered by Anonymous · 0⤊ 0⤋
2w+3 is the length. there are two sides of the rectangle that are that long, hence the 2(2w+3).
2007-12-30 09:29:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋
2(2W+3) +2W=48
Distribute 2 into 2W+3
= 4W+6+2W=48
Add 4W and 2W
= 7W+6=48
subtract 6 from 6 and 48 7W+6-6=48-6
= 7W=42
Divide 7 into 42
=6
2007-12-30 08:57:36 · answer #7 · answered by Jennie 2 · 0⤊ 0⤋
this is basic. you're able to do 6 x 2 meaning 6 rows of two cans, 2 x 6 meaning 2 rows of 6 cans, a million x 12 meaning one row of 12 cans, 12 x a million meaning twelve rows of a million can, 4 x 3 meaning 4 rows of three cans and 3 x 4 meaning 3 rows of four cans.
2016-12-11 17:11:06 · answer #8 · answered by reust 4 · 0⤊ 0⤋
it is 3 dimensional so the 2 shows multiple sides....
2007-12-30 08:48:11 · answer #9 · answered by Anonymous · 0⤊ 2⤋
When did they start putting letters with it.
2007-12-30 08:47:34 · answer #10 · answered by . 5 · 0⤊ 3⤋