Calculate the amount of your simple interest investment after 10 years. Remember to use the same rate and compounding as in #1.
So my interesrt is .84% daily. and i already have 7500 in my account

- anonymous

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- anonymous

@zepdrix

- zepdrix

\[\Large I=Prt\]
Hmm I don't think simple interest has anything to do with compounding as we had in our compound interest problem. I wonder why they mentioned it here. hmm :o

- zepdrix

\[\Large P=7500\]\[\Large r=.0084\]\[\Large t=10\]
\[\Large I=?\]
:D

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## More answers

- anonymous

630?

- zepdrix

Mmmmmmm yah that sounds right :o
I'm not too familiar with the interest problems but I think that's all they wanted us to do for this one.

- anonymous

Thank you so much for helping me! yayy!

- zepdrix

lol yer silly c:

- anonymous

OK ARE YOU UP FOR ONE MORE?"_

- zepdrix

sure, just post it in this thread, it's not very long yet so shouldn't be a problem.

- anonymous

let me just send you a picture hold on

- anonymous

ok we are on number 3 :))))

##### 2 Attachments

- zepdrix

Ooo fun graph tool :O look at all the buttons!

- anonymous

ahahhahhaaahah! i just laughed so hard hahahaha your so silly!

- zepdrix

sure, just post it in this thread, it's not very long yet so shouldn't be a problem.

- zepdrix

Ooo fun graph tool :O look at all the buttons!

- zepdrix

So let's graphing the Simple Interest first since that will be easier.
We'll graph `time` in the horizontal direction (the x direction),
and `cash monies` in the vertical direction (the y direction).

- zepdrix

So this is where we'll want to go back to using a ton of brackets so our answer will be ACCURATE.

- zepdrix

Recall after we plugged in all of our jimmy jammies we had,\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*10}\]
But what we want to do now is, we DON'T want to plug in the `t` value.
We want to allow our `t` to vary.Recall after we plugged in all of our jimmy jammies we had,\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*t}\]

- zepdrix

Blah fail copy paste.. my bad.

- zepdrix

So that function we have there... we want to write it using brackets and stuff so the program will graph it.

- anonymous

woah woah woah what? i have no idea what your talking about :(

- zepdrix

You remember this?\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*10}\]

- anonymous

and here is the link to the graph thing. http://www.geogebra.org/cms/en/

- zepdrix

There's a chrome app? oo very cool

- anonymous

and yes i do remember that equation

- zepdrix

\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*\color{#F35633}{10}}\]
The 10 is there because the problem told us to \(\Large t=10\).
We want to undo plugging that 10 in giving us this now.\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*\color{#F35633}{t}}\]k? :o

- anonymous

ok! and what does this have to do with the graphing though???

- zepdrix

The amount of cash money we can make, \(\Large A\) is related to the amount of time, \(\Large t\), we allow to pass.
So we can show how our money relates to time by graphing a line, or curve in this case.

- zepdrix

Ah crap, I said we were going to start with `Simple Interest` didn't I? Grr

- zepdrix

Ok ok let's switch to the Simple Interest Formula a sec.

- zepdrix

\[\Large I=Prt \qquad\to\qquad I=7500*.0084*\color{#F35633}{10}\]Again, we want to undo plugging in the 10.\[\Large I=7500*.0084*\color{#F35633}{t}\]

- zepdrix

The graphing utility will only allow us to graph in x and y.
So remember what I mentioned earlier.
We'll graph time in the horizontal direction (as x),
and Interest in the vertical direction (as y).

- zepdrix

\[\Large y=7500*.0084*x\]
Understand? D: A little bit maybe?

- zepdrix

Uh oh :c your head esplode?

- anonymous

no no no i understand!

- anonymous

@zepdrix ?

- zepdrix

So at the bottom of the graphing utility, there is a space to type in your function.

- zepdrix

Did you try graphing it yet? :o

- anonymous

what do i graph?

- anonymous

ugh this is so frustrating!

- zepdrix

This is our simplie interest formula, graph this, \[\Large y=7500*.0084*x\]

- anonymous

in x?

- zepdrix

I changed \(\Large I\) to \(\Large y\),
and \(\Large t\) to \(\Large x\).
That allows us to graph this in \(\large x\) and \(\Large y\).

- anonymous

so 7500 * . 0084 * x is for the Y axis?

- zepdrix

yes,
x is for the x axis.
7500*.0084*x is for the y axis.

- zepdrix

You see the `input` box at the bottom, right? :o

- anonymous

yes and i entered it in there

- anonymous

and this is what it looks like

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- anonymous

is this correct?

- zepdrix

Yes.
So you see that tiny sliver?
It's a line with a really really big slope.
So it's growing really quickly.

- zepdrix

The other one will be a tad harder to type into our input box.
We'll have to be careful with the brackets we use.\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365t}\]
In x and y this becomes,\[\Large y=7500\left(1+\frac{.0084}{365}\right)^{365x}\]

- zepdrix

We'll want to input it like this,\[\Large y=7500(1+(.0084/365))\wedge(365x)\]

- zepdrix

Hmm it's not accepting it.. lemme see what's going on -_-

- anonymous

ok:(

- zepdrix

Mmm ok I guess we don't want to use that many brackets.
put this into the input box:
7500(1+.0084/365)^(365x)

- zepdrix

You'll have to zoom way way out in order to actually see the line.

- anonymous

ok lets seeee....

- anonymous

how do i zoom?

- zepdrix

Do you have a scroll wheel on your mouse? :)
Are you using a mouse? hehe

- anonymous

no im on a laptop

- zepdrix

Go to the last icon on the top bar, which looks like a cross with arrows on the end.
Click the white arrow under it for a drop down menu, there should be a zoom out option.

- anonymous

even when i zoom in i cant see it :(

- zepdrix

zoom out! :O

- anonymous

does your look like this?

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- zepdrix

yesss good good

- zepdrix

So hopefully we're doing this right +_+ lol

- zepdrix

Mmm crap hold on....

- anonymous

i know right haha now what?

- zepdrix

Ohhh Ok ok ok ok ok ok ok ok

- zepdrix

Check back on your first problem page.
See below the input example, the message:
`Notice that A= was not included, that 10 was used instead of 10,000 (because this graph is scaled in thousands),`

- zepdrix

I think they want us to scale this like they did in the example.
Hmm

- zepdrix

It will look a lot nicer when we graph it.

- anonymous

how do we do that?

- zepdrix

Ummmmmmmmmm

- anonymous

hahah i thought so too!

- zepdrix

I guess we could use the same scale they did in the example.
So we would divide our `Principle` value by 10,000.
Err no, 1000 scale would make more sense maybe.... grrrr

- anonymous

what should i do then??

- zepdrix

Dividing our principal value by 1000 gives us,
P=7500/1000 --> P=7.5
So we would instead want to graph:
7.5(1+.0084/365)^(365x)
and
7.5*.0084x

- zepdrix

They look a little bit better I guess.
I dunno.. the instructions are confusing for this question >:C

- zepdrix

You'll have to zoom OUT a bit to get the nice shape.
It will look better than the previous one did though.

- anonymous

i got it!but how come it doesnt look like the one in the example?

- zepdrix

What example ? :o

- anonymous

the one that i linked to you? ill show it again hold on

- anonymous

##### 1 Attachment

- zepdrix

There is no line graphed in that picture..
You mean the way the graph layout looks?

- anonymous

yes! idk is it suppossed to look like the example?

- zepdrix

Mmm there was a button to add a `grid` .. i'm trying to remember where it was at.

- zepdrix

I guess you can right click on the graph, `show grid`

- zepdrix

That will make it look a bit similar :o

- anonymous

where is that at?

- zepdrix

right click your mousey button on the graph. a menu will pop up

- anonymous

oh ok! now what do i do?

- zepdrix

You can label the axes like they did in the example, if you want.
Something like this, but not stupid lol.

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- zepdrix

That's probably not necessary though :o lol

- zepdrix

you are online school or something?

- anonymous

ahahahahahahhahhaahahahha i cant stop laughing :p that was funny. cash moneyyy! lol and ugh yes i am :(

- zepdrix

What next? I dunnoooo. I think that's all we need to do +_+
looks like you have to send a copy to your teacher or somethingggg.
Maybe it would be a good idea to label the y axis in thousands, so they know we scaled it.

- anonymous

okok! are you getting tired of helping me ;p;

- zepdrix

Buhaha XD yes!

- zepdrix

Maybe label them like this or something? :d

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- anonymous

yay! ok i will! helping me haha i think i love you!

- anonymous

thank you for *

- zepdrix

oh my <:o

- anonymous

ahhahaha! but really..thank you so much! i know that was rough haha

- anonymous

@zepdrix what is the difference between the simple interest and the compound from the graph?

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