Help with 6th and final question please???

Mister_Scary · 2010-10-22 17:04:26

bobbym · 2010-10-22 21:00:23

Hi Mister_Scary;

Okay we have this problem:

We want to solve in terms of w. This is just like the other 5 problems that I did for you.
We will use the same ideas. We try to get the w by itself.

Multiply by 24t^2

Now divide by l^3. Both sides remember.

Switch it!

Now how do you undo a w^2? Easy, with the square root!
Now take the square root of both sides and match what you get with your choices.
C'mon give it a try. This one is done for you!

Mister_Scary · 2010-10-22 21:39:42

I honestly wish I had the slightest clue.

Your last figure at the bottom looks almost like the figure shown as "D" in the list of possible answers.

bobbym · 2010-10-22 21:42:48

You will not need luck and you will have more than the slightest idea just follow along with me. I will do the best I can.

We are here.

We want that

to be a w. Do follow me so far?

Mister_Scary · 2010-10-22 22:29:13

No, and that's why I came here. But now I see that I'm just going to have to get the answers to questions 2, 3 and 6 wrong on this stupid test I have to take.

Thank you for your time and effort.

bobbym · 2010-10-22 22:32:37

Hold it just stick around. Tests are not stupid and you do not have to answer questions wrong. If you give some hint as to what you do not know.

Do you know this?

Mister_Scary · 2010-10-22 22:58:10

No, and after this test I will NEVER want or need any of this math again.

bobbym · 2010-10-22 23:19:39

No, and after this test I will NEVER want or need any of this math again.

I said that too. The more I tried to run from it the worse it got. It might be that way for you. Wisest man I ever knew told me never to run away. He said,"What you run away from you will run smack into. What you run away from is not behind you it is in front of you."

Okay so we can get the w by taking the square root of both sides:

We know what the left side is, yes we do.

Does this look familiar to you?

Mister_Scary · 2010-10-22 23:28:51

You know it does!!:D

You have been a real life saver. I only wish I could have been a better student. Your patience is amazing and I can tell you really love the world of MATH!!

Last edited by Mister_Scary (2010-10-22 23:29:19)

bobbym · 2010-10-22 23:34:53

You have been a real life saver. I only wish I could have been a better student. Your patience is amazing and I can tell you really love the world of MATH!!

Forget the lifesaver part. I dream about saving the drowning Cameron Diaz, of course she is eternally grateful, then I wake up.

Everbody is a student forever, you have more chances to be good one. Every day is a new chance. I do love math but I started by hating it, sound familiar?

Alive · 2010-10-23 00:06:38

bobbym wrote:

Every day is a new chance. I do love math but I started by hating it, sound familiar?

Very nice response Sometimes I like to wander randomly on other threads to see positive words

bobbym · 2010-10-23 00:27:53

Hi Alive;

If you are seeking them out it is usually not me uttering them. I am a little on the negative side.

Alive · 2010-10-23 00:31:49

bobbym wrote:

Hi Alive;
If you are seeking them out it is usually not me uttering them. I am a little on the negative side.

I've never seen you say negative things... maybe missed them on purpose if there was any

bobbym · 2010-10-23 00:40:42

No I do not say them but I sure am thinking them.

Bob · 2010-10-23 02:32:21

Hi Mister_Scary

I've only just read your posts. Am I right in thinking you're only doing these to get through some horrid exam? Here's a method that'll work that needs little algebra at all. It works because they've kindly given you a choice of answers.

Take your formula and choose numbers to replace each letter on the right hand side.

eg. P = 2L + 2W Choose L = 5 and W = 7 (for example)

Now calculate the left hand side using these values.

eg. P = 2 x 5 + 2 x 7 = 10 + 14 = 24.

Now you have a complete set of numbers that'll work in any re-arrangement of the formula.

Try the numbers in each multi-choice answer.

a)

so that means

This is wrong for w, because I started with w = 7.

b)

Also wrong for w.

c)

This is the correct value for w so I think this is the right answer, but I'll check d to be sure.

d) w = P - A

This must be wrong as I don't know anything about A

So c) is the correct answer.

Hope this helps.

If you want to learn how to change the subject of a formula (especially if you aren't given multi-choice answers) I have got a method that reduces 99.9% of cases to four basic steps. Looking at your problems I don't think the one case 0.1% is going to come up so, if you post back and ask, I'll tell you the details with a few examples.

Either way, good luck with the exam,

Bob

Math Is Fun Forum

#1 2010-10-22 17:04:26

Help with 6th and final question please???

#2 2010-10-22 21:00:23

Re: Help with 6th and final question please???

#3 2010-10-22 21:39:42

Re: Help with 6th and final question please???

#4 2010-10-22 21:42:48

Re: Help with 6th and final question please???

#5 2010-10-22 22:29:13

Re: Help with 6th and final question please???

#6 2010-10-22 22:32:37

Re: Help with 6th and final question please???

#7 2010-10-22 22:58:10

Re: Help with 6th and final question please???

#8 2010-10-22 23:19:39

Re: Help with 6th and final question please???

#9 2010-10-22 23:28:51

Re: Help with 6th and final question please???

#10 2010-10-22 23:34:53

Re: Help with 6th and final question please???

#11 2010-10-23 00:06:38

Re: Help with 6th and final question please???

#12 2010-10-23 00:27:53

Re: Help with 6th and final question please???

#13 2010-10-23 00:31:49

Re: Help with 6th and final question please???

#14 2010-10-23 00:40:42

Re: Help with 6th and final question please???

#15 2010-10-23 02:32:21

Re: Help with 6th and final question please???

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