सदस्य: Melody

Prosperous2014:
5. The profit of an organization is calculated by the function P(x)=x^2-4000x+780000, where x is the number of units sold. If the net profit is 3800000, find the number of items sold.

You are being told that profit is a function of how many units are sold.
If the net profit is 3800000, find the number of items sold. That means P(x) = 3800000 find x
in other words, solve
3800000 = x^2-4000x+780000

You have to take 3800000 to the other side and solve it using the quadratic formula.

Melody26 Jan 2014

+118691

Lilly:
A=100 [(1+0.15/12) to the 12 x 3/4 power all of this over 0.15/12; 9 months with an APR 15% and monthly pymts of $100 please help

Hi Lilly,
This appears to be a compound interest formula

A = 100(1+0.15/12) ^12x3/4

In words this is
I invest $100 in a bank account where the interest rate is 15% compounded monthly. How much money will be in the account in 9 months time?

In order not to make a calculator error it may be best to do this in bits.

A = 100(1.0125) ⁹
A = 100*1.118292177
A = $111.83 (to the nearest cent)

Dividing this by 0.15/12 does not make sense. Why do you want to do that?

Melody26 Jan 2014

+118691

Guest:
Is there a difference between x^1/2 and x^2/4 when x is negative?

Anonymous4338 and I are both assuming that you mean
x^(1/2) and x^(2/4)

because, if you mean

(x^1)/2 and (x^2)/4
then they are always completely different.

Melody26 Jan 2014

+118691

Guest:
Is there a difference between x^1/2 and x^2/4 when x is negative?

Anonymous4338 and I are both assuming that you mean
x^(1/2) and x^(2/4)

because, if you mean

(x^1)/2 and (x^2)/4
then they are always completely different.

Melody26 Jan 2014

+118691

teresa:
t 3/4=4

Almost Anonymous4338

t x 3/4 = 4 Anonymous4338 is correct. You divide both sides by 3/4 BUT that is the same as multiplying both sides by 4/3

t x 3/4 x 4/3 = 4 x 4/3 (3/4 x 4/3 = 1) and 4 = 4/1

t x 1 = 4/1 x 4/3

t = 16/3

t = 5 1/3

Melody26 Jan 2014

+118691

Thank you DavidQD as well. I really appreciate you helping Princess Sophie with her question.
Melody

Melody26 Jan 2014

+118691

harley:
4 1\8 - 4 1\3

My goodness harley,
You've got 3 answers and they are ALL different. What can you make of that

I haven't actually done your question yet, so lets see if I can't agree with at least one of the other responants.

Now, what you have here is

4 + 1/8 - 4 - 1/3 Be careful here, you have to take away the 1/3 as well as taking away the 4.
If I re-arrange this I get

4 - 4 +1/8 - 1/3 A minus sign always belongs to the number behind it. That is really important to understand and remember.
4-4=0 so we are left with

1/8 - 1/3 Now, if you understand what fractions mean then you will know that 1/8 is smaller than 1/3 [if you are not sure about this then you better post again and I will explain it]
Since 1/3 is bigger than 1/8, you should realize that the answer HAS to be negative. (YOu will just use this as a check when you are finished)

Now, just like the others told you, you need to get a common denominator before you can do the subtraction. That means that the number on the bottom has to be the same!
The multiples of 8 are 8,16,24,32, etc
The multiples of 3 are 3,6,9,12,15,18,21,24,27 etc.
The smallest number that is in both lists is 24. So you have to change both your fractions to 24ths.
Now 8x3=24 so
1/8 becomes 1*3 / 8*3 = 3/24 and
1/3 becomes 1*8 / 3*8 = 8/24
so now you have
1/8 - 1/3 => 3/24 - 8/24 => (3-8) / 24 => -5 /24

So I would vote for Anonymous4338's answer.

Thankyou to all 3 of you for answering. It doesn't matter if you get it wrong sometimes. I want people to get involved.

Melody26 Jan 2014

+118691

I like Serena:
Melody:
Could one of you possible do this question for Princess Sophie please.

It would be wonderful, if you could.

http://web2.0calc.com/questions/math_1320

Thanks.

I just did.

Thanks very much. I really appreciate it.
Melody.

Melody26 Jan 2014

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