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tannawirsch:
Thank you SO much for your help! Although I've got one question about this.

I tried to put it into a graph and it doesn't work. I need an equation that is able to be used in a graph.

Sorry, I should have mentioned that earlier.

Hi again tannawirsch,

Why can't you graph it?

They are both in the positive quadrant only.
The first one has c on the horzontal axis, the second on has x on th horizontal axes.
They both have y on the vertical axis.

For the first one start c=1,c=2, etc and calculate the y value that goes with it and then graph.

For the second one the y axis has to go from 0 to 100%
Work out some points starting with x=0,x=1, etc and calculate the y values that go with them and then graph it.

MelodyJan 21, 2014

+118725

You need to be more specific.

MelodyJan 21, 2014

+118725

cin:
The formula mass of CuS04 . 5 H20 is?

Hint: Atomic Mass: Copper (Cu )= 64 amu, Sulfur (S) = 32 amu , Oxygen (O) = 16 amu, Hydrogen (H ) = 1 amu

You might get an answer here if you are very lucky but this is not the best forum for a question like this.
There must be heaps of science/chemistry forums about.
I know there is a section in mathhelpforum.com that deals with chemistry and physics questions as well.

MelodyJan 21, 2014

+118725

Physics:
a man is pulling on his dog with a force of 70.0N directed at an angle of +30.0 degrees to the horizontal.
A.) Find the x component of this force.

Draw the triangle. - Solve with trigonometry.

MelodyJan 21, 2014

What's the weight ratio? Is it like, one gram to every cubed cm?

GuestJan 21, 2014

http://www.math.uoc.gr/~chatzipa/index_files/optics102/2013-b/diffform.pdf

I don't know much about it, but you could try that. ^_^

GuestJan 21, 2014

Well, to find a percentage you take the percent and convert it to decimal form and then multiply that by your other number. For example:

15% of 150 = ?
15% = 0.15
0.15 x 150 = 22.5

So, 15% of 150 is 22.5

The problem you have takes the percent and adds it back to the original number. For example:

$25.75 + 15% = ?

15% = 0.15

0.15 x $25.75 = $3.86

$3.86 + $25.75 = $29.61

Does that make sense? ^_^

GuestJan 21, 2014

Nobody Special:
Well, 1 plus 1/2 is 1 1/2.

Or did you mean 24 fifths plus two fifths?

no i just meant whats 24 plus 2 fifths thank you

GuestJan 21, 2014

well what is the expression below?

GuestJan 21, 2014

Well, 1 plus 1/2 is 1 1/2.

Or did you mean 24 fifths plus two fifths?

GuestJan 21, 2014

Well, since time only moves forward, I suppose traveling to the future might be possible, but I think it would be impossible (or at least very hard) to go backwards... I don't know It'd be cool though!

GuestJan 21, 2014

DONT MAKE FUN OF ME FOOL.... YOU,,,,,,,

GuestJan 21, 2014

A great advice for math forums! Correct grammar! Haha

GuestJan 21, 2014

$100.40 +16%

GuestJan 21, 2014

+39

Thank you SO much for your help! Although I've got one question about this.

I tried to put it into a graph and it doesn't work. I need an equation that is able to be used in a graph.

Sorry, I should have mentioned that earlier.

tannawirschJan 21, 2014

+118725

What is the smallest positive integer with exactly 768 divisors.

This question is driving me nuts.

MelodyJan 21, 2014

#13

+118725

+26

There were some excellent answers today from Sportsguy007, Walt, Zamarronics, Nobody Special, and guest. I really appreciate your efforts and I am sure that the people who posted the questions all did too. There really are too many questions for me to answer them all, plus the fact that I don't want to.
Walt answered one of the difficult questions from yesterday so there is just the one unanswered one left (Walt posted it)
Zamarronics, I thought you might like to take a look at Walt's questions. I'll bump them up so they are easy to find.

Please note that indice (exponent) questions and answers are much easier to read if you use the superscript button 'sup', that is located above the smilies, instead of using the ^ key.
Try and keep that in mind.

Thanks everybody.

MelodyJan 21, 2014

+118725

tanna.wirsch:
Find an equation for this question:

You get a new job and your contract is one month long. On the first day your boss invests 1cent into an account for you which pays 100% interest per day. (on the second you get 2c, on the third you get 4c) On the last day of work your boss will close the account and give you the balance.
Can you find an equation to find the amount in the account at any given day?

I just finished and i then realized that I had read the question wrong. I thought I was getting paid an extra 1 cent every day but I am not. I am only getting paid 1c once.
Oh well, I've done it now so i will leave it there.

My made up question: You get a new job and your contract is one month long. On the first day your boss invests 1cent into an account for you which pays 100% interest per day. (on the second you get 2c, on the third you get 4c) On the last day of work your boss will close the account and give you the balance. He invests another 1c each day that you work and it also accrues interest at 100% per day.

day
1 ......1
2 ......2 + 1
3.......4 + 2 + 1
4 ......8 + 4 + 2 + 1
5 .....16+ 8 + 4 + 2 + 1
...
d .....2 ^n-1 + 2 ^n-2 + ......+1

So on day n (after the 1c payment) you will have 1+2+4+8+ ......+ 2 ^d-1

As Walt said, this is a GP
a=1 r=2
[This is just the formula - S stands for Sum] S _n=a(r ⁿ-1) / (r-1)

S _d=1(2 ^d-1) / (2-1)

S _d= 2 ^d-1

So after d days I will have a total of 2 ^d-1 cents

To get a proper appreciation for this I will show you some earnings.

On the 10th day I will have 1023c or $10.23
On the 20th day I will have 1048575c or $10,485.75
On the 30th day I will have 1073741823 cents or $10,637,418.23
------------------------------------------------------------------------------------------------------------------------------------
I've finished now and I just realized that I misread the question. I thought I was getting paid an extra 1 cent every day but I am not. I am only getting paid 1c once.
What a cheap skate boss! Now I will have to start again.

Original Question: You get a new job and your contract is one month long. On the first day your boss invests 1cent into an account for you which pays 100% interest per day. (on the second you get 2c, on the third you get 4c) On the last day of work your boss will close the account and give you the balance.

[size=150]Walt was completely correct.[/size] On day d you will have 2 ^(d-1) cents or 2 ^(d-1)/100 dollars

On the 10th day I will have $5.12
On the 20th day I will have $5242.88
On the 30th day I will have $5,368,709.12

I would have rather had the 10.6 million dollars, not just a measely 5.3 million. What a disappointment!

This is the graph that Walt was talking about.
140121 Payment.JPG

MelodyJan 21, 2014

+118725

teeashley:
4e0.5

It is just
4 x 'shift' e 0.5 = 6.594885 (to 7 sig figures)

you don't press the power button - it is built into the e function. Maybe this is why you were having problems.

MelodyJan 21, 2014

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