Standard normal curve

survival · 2011-04-20 11:53:08

I hope your day was better than mine.

bobbym · 2011-04-20 11:55:34

Hi survival;

No, this thread is fine. Just try to combine your posts together instead of posting twice. There is an edit button at the bottom of each post.

Report | Delete | Edit | Quote | Make Question

Press edit and you can edit or add to your posts. It is much easier for me to follow your questions then.

survival · 2011-04-20 11:57:25

OK, my problem was in the last column. I did not realize I could edit my replies.

bobbym · 2011-04-20 12:06:44

No problem! Much better!

Did you copy the equation correctly?

survival · 2011-04-20 12:18:53

Let's look at it.
0.30 (6) + 0.05 =0.15 (6+x)

bobbym · 2011-04-20 12:24:05

survival · 2011-04-20 12:36:35

Don't know why but the answer is wrong. I wonder what happened.

survival · 2011-04-20 12:37:45

Oh, would it make any difference if it says: "The solution set is:"
Is that why it won't take?

bobbym · 2011-04-20 12:37:53

That is why I asked if you copied the problem right! Do they want a fraction or do they want a decimal?

I see what the problems is!

In post #150 you wrote

0.30 (6) + 0.5x = 0.15 (6+x)

But in post # 155 you wrote:

0.30 (6) + 0.5 = 0.15 (6+x)

Which one would you like solved?

survival · 2011-04-20 12:46:12

It says solve the equation:

and after the problem,

The solution set is { }

bobbym · 2011-04-20 12:47:42

I see what the problems is!

In post #150 you wrote

0.30 (6) + 0.5x = 0.15 (6+x)

But in post # 155 you wrote:

0.30 (6) + 0.05 = 0.15 (6+x)

Which one would you like solved?

survival · 2011-04-20 12:55:46

0.30(6) + 0.05x=0.15(6+x).
I am sorry. It looks like i left out a zero.
Solution set is asked for.

bobbym · 2011-04-20 12:57:39

Hi survival;

x = 9

survival · 2011-04-20 13:06:46

Thank you! Here's a different one.
Solve for n.

F = 9/2 (n-10)
The solution set is n = ____F + ____.

Those lines are empty boxes.

bobbym · 2011-04-20 13:12:36

n = 2 / 9 F + 10

survival · 2011-04-20 13:19:29

You are quiet today. Are you all right?

Translate the verbal phrase into a mathematical expression.
The ratio of 33 and a non zero number, b

The mathematical expression is____

bobbym · 2011-04-20 13:23:31

Just swamped with problems. I am currently working on 3 at the same time. I am not getting any answers. I know it is unusual for me to be quiet.

33 / b

survival · 2011-04-20 13:27:23

I hope everything will be okay.

If 5 is added to a number and the sum is tripled, the result is 19 more than the number. What is the number? I guess you would say 3 x 5 and just add the 19?

bobbym · 2011-04-20 13:37:34

Yes, like you he is cramming. This is not good and I discourage it. I used to do it all the time but I still cannot recommend it.

This is a word problem. You translate each statement into algebra, one at a time.

Call the number n.

If 5 is added to a number

n + 5

and the sum is tripled

3(n+5)

The result is 19 more than the number.

n = 19

Set them equal to each other.

So the number is 2.

survival · 2011-04-20 13:46:24

May I ask who "he" you are referring to?

If 7 is added to twice a number and this sum is multiplied by 4, the result is the same as if the number is multiplied by 5 and 10 is added to the product. What is the number?

bobbym · 2011-04-20 13:55:26

The poor fellow called blurguy is cramming for his statistics and probability assignments. I think his deadline is 4 / 24. gAr and I have been assisting him. I am researching 2 of his problems now.

The number is (- 6)

survival · 2011-04-20 14:02:13

I know how he feels. Statistics is difficult, but can be used with a calculator sometimes. I don't think there are calculators for Algebra and next week after I finish this, I have a week of Geometry. I have never had geometry in my life.

Solve A = 2BD + 2BC + 2DC for C.
C =____

survival · 2011-04-20 14:06:54

The linear model below gives the approximate enrollment, in thousands, for degree-granting institutions in a certain city from the year 2003, where x = 0 corresponds to 2003, x = 1 to 2004 and so on.
y = 0.2188x + 15.43
a. what is the projected enrollment for Fall 2012?
b. In what year is the enrollment projected to reach 18 thousand?

Ouch, that was a long word problem.

bobbym · 2011-04-20 14:08:49

That is why we should go over the algebra here. All math builds on every other part. Algebra is certainly the foundation of all your later math.

survival · 2011-04-20 14:16:38

I agree and others will learn as well.
This is confusing.
a. The projected enrollment for Fall 2012 is ___thousand.

That goes with the last problem.

Last edited by survival (2011-04-20 14:21:21)

Math Is Fun Forum

#151 2011-04-20 11:53:08

Re: Standard normal curve

#152 2011-04-20 11:55:34

Re: Standard normal curve

#153 2011-04-20 11:57:25

Re: Standard normal curve

#154 2011-04-20 12:06:44

Re: Standard normal curve

#155 2011-04-20 12:18:53

Re: Standard normal curve

#156 2011-04-20 12:24:05

Re: Standard normal curve

#157 2011-04-20 12:36:35

Re: Standard normal curve

#158 2011-04-20 12:37:45

Re: Standard normal curve

#159 2011-04-20 12:37:53

Re: Standard normal curve

#160 2011-04-20 12:46:12

Re: Standard normal curve

#161 2011-04-20 12:47:42

Re: Standard normal curve

#162 2011-04-20 12:55:46

Re: Standard normal curve

#163 2011-04-20 12:57:39

Re: Standard normal curve

#164 2011-04-20 13:06:46

Re: Standard normal curve

#165 2011-04-20 13:12:36

Re: Standard normal curve

#166 2011-04-20 13:19:29

Re: Standard normal curve

#167 2011-04-20 13:23:31

Re: Standard normal curve

#168 2011-04-20 13:27:23

Re: Standard normal curve

#169 2011-04-20 13:37:34

Re: Standard normal curve

#170 2011-04-20 13:46:24

Re: Standard normal curve

#171 2011-04-20 13:55:26

Re: Standard normal curve

#172 2011-04-20 14:02:13

Re: Standard normal curve

#173 2011-04-20 14:06:54

Re: Standard normal curve

#174 2011-04-20 14:08:49

Re: Standard normal curve

#175 2011-04-20 14:16:38

Re: Standard normal curve

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