i need help with this problem

nottosmartinmath15

New member
Joined
Aug 11, 2005
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2
im am reeelly stumped on this question

P= 17, L= 5.5, W=?

its a find the missing measuere in each formula if p=2L + 2W and A=LW
P is perimeter and L is length, W is width, and A is area

if you can help i woud apriciate it :p
 
Plug the given numbers into P = 2L + 2W to obtain:

17 = 2 * 5.5 + 2W
17 = 11 + 2W

Now solve for W.
 
17 = 2 * 5.5 + 2W
17 = 11 + 2W
17-11 =2W
6 = 2W
6/2=w
3=W

try a little more.................
 
nottosmartinmath15 said:
but how do i find W? thats the problem i cant figure out
You were given: 17 = 11 + 2W and you don't know how to solve that?
Well me boy/gal, you're sure in trouble...

Say you buy 2 apples at 10 cents each and pay with a quarter:
so for your quarter, you'll get 2 apples and a nickel, right?
Now if A = apple, then 2A + 5 = 25 : ok?
Or 2A = 25 - 5 : the apple clerk got your quarter and gave you back a nickel; clear?

So we're now at: 2A = 20
Then A = 20/2 = 10 : 10 cents per apple

Now, the 2W + 11 = 17 works the SAME way:
2W = 17 - 11
2W = 6
W = 6/2 = 3

Same as buying 2 apples at 3 cents each, giving the apple clerk 17 cents,
and the apple clerk gives you back 2 apples and 11 cents...

Hmmm...hope that helps rather than confuse !
 
dark-kitsune said:
that was indeed a bit cunfusing, Denis. :?
Well then Foxy, be careful next time you buy apples;
make sure you have the correct change :)

Here's a little apple-shopper thingie:
You buy 3 apples at 25 cents each;
you give the clerk a dollar;
the clerk gives you 2 apples, then says I'll be back with the other...
so temporarily, you have 2 apples and are short your dollar,
while the clerk owes you an apple and 25 cents:
You = Clerk
2A - 100 = -A - 25
3A = 75
A = 75/3 = 25 : 25 cents for an Apple

Hope this helps you next time you buy apples !
 
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