anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@zepdrix
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
  • zepdrix
\[\Large P=7500\]\[\Large r=.0084\]\[\Large t=10\] \[\Large I=?\] :D

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More answers

anonymous
  • anonymous
630?
zepdrix
  • 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
  • anonymous
Thank you so much for helping me! yayy!
zepdrix
  • zepdrix
lol yer silly c:
anonymous
  • anonymous
OK ARE YOU UP FOR ONE MORE?"_
zepdrix
  • zepdrix
sure, just post it in this thread, it's not very long yet so shouldn't be a problem.
anonymous
  • anonymous
let me just send you a picture hold on
anonymous
  • anonymous
ok we are on number 3 :))))
zepdrix
  • zepdrix
Ooo fun graph tool :O look at all the buttons!
anonymous
  • anonymous
ahahhahhaaahah! i just laughed so hard hahahaha your so silly!
zepdrix
  • zepdrix
sure, just post it in this thread, it's not very long yet so shouldn't be a problem.
zepdrix
  • zepdrix
Ooo fun graph tool :O look at all the buttons!
zepdrix
  • 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
  • zepdrix
So this is where we'll want to go back to using a ton of brackets so our answer will be ACCURATE.
zepdrix
  • 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
  • zepdrix
Blah fail copy paste.. my bad.
zepdrix
  • zepdrix
So that function we have there... we want to write it using brackets and stuff so the program will graph it.
anonymous
  • anonymous
woah woah woah what? i have no idea what your talking about :(
zepdrix
  • zepdrix
You remember this?\[\Large A=7500\left(1+\frac{.0084}{365}\right)^{365*10}\]
anonymous
  • anonymous
and here is the link to the graph thing. http://www.geogebra.org/cms/en/
zepdrix
  • zepdrix
There's a chrome app? oo very cool
anonymous
  • anonymous
and yes i do remember that equation
zepdrix
  • 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
  • anonymous
ok! and what does this have to do with the graphing though???
zepdrix
  • 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
  • zepdrix
Ah crap, I said we were going to start with `Simple Interest` didn't I? Grr
zepdrix
  • zepdrix
Ok ok let's switch to the Simple Interest Formula a sec.
zepdrix
  • 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
  • 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
  • zepdrix
\[\Large y=7500*.0084*x\] Understand? D: A little bit maybe?
zepdrix
  • zepdrix
Uh oh :c your head esplode?
anonymous
  • anonymous
no no no i understand!
anonymous
  • anonymous
@zepdrix ?
zepdrix
  • zepdrix
So at the bottom of the graphing utility, there is a space to type in your function.
zepdrix
  • zepdrix
Did you try graphing it yet? :o
anonymous
  • anonymous
what do i graph?
anonymous
  • anonymous
ugh this is so frustrating!
zepdrix
  • zepdrix
This is our simplie interest formula, graph this, \[\Large y=7500*.0084*x\]
anonymous
  • anonymous
in x?
zepdrix
  • 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
  • anonymous
so 7500 * . 0084 * x is for the Y axis?
zepdrix
  • zepdrix
yes, x is for the x axis. 7500*.0084*x is for the y axis.
zepdrix
  • zepdrix
You see the `input` box at the bottom, right? :o
anonymous
  • anonymous
yes and i entered it in there
anonymous
  • anonymous
and this is what it looks like
1 Attachment
anonymous
  • anonymous
is this correct?
zepdrix
  • 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
  • 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
  • zepdrix
We'll want to input it like this,\[\Large y=7500(1+(.0084/365))\wedge(365x)\]
zepdrix
  • zepdrix
Hmm it's not accepting it.. lemme see what's going on -_-
anonymous
  • anonymous
ok:(
zepdrix
  • 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
  • zepdrix
You'll have to zoom way way out in order to actually see the line.
anonymous
  • anonymous
ok lets seeee....
anonymous
  • anonymous
how do i zoom?
zepdrix
  • zepdrix
Do you have a scroll wheel on your mouse? :) Are you using a mouse? hehe
anonymous
  • anonymous
no im on a laptop
zepdrix
  • 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
  • anonymous
even when i zoom in i cant see it :(
zepdrix
  • zepdrix
zoom out! :O
anonymous
  • anonymous
does your look like this?
1 Attachment
zepdrix
  • zepdrix
yesss good good
zepdrix
  • zepdrix
So hopefully we're doing this right +_+ lol
zepdrix
  • zepdrix
Mmm crap hold on....
anonymous
  • anonymous
i know right haha now what?
zepdrix
  • zepdrix
Ohhh Ok ok ok ok ok ok ok ok
zepdrix
  • 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
  • zepdrix
I think they want us to scale this like they did in the example. Hmm
zepdrix
  • zepdrix
It will look a lot nicer when we graph it.
anonymous
  • anonymous
how do we do that?
zepdrix
  • zepdrix
Ummmmmmmmmm
anonymous
  • anonymous
hahah i thought so too!
zepdrix
  • 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
  • anonymous
what should i do then??
zepdrix
  • 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
  • zepdrix
They look a little bit better I guess. I dunno.. the instructions are confusing for this question >:C
zepdrix
  • 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
  • anonymous
i got it!but how come it doesnt look like the one in the example?
zepdrix
  • zepdrix
What example ? :o
anonymous
  • anonymous
the one that i linked to you? ill show it again hold on
anonymous
  • anonymous
1 Attachment
zepdrix
  • zepdrix
There is no line graphed in that picture.. You mean the way the graph layout looks?
anonymous
  • anonymous
yes! idk is it suppossed to look like the example?
zepdrix
  • zepdrix
Mmm there was a button to add a `grid` .. i'm trying to remember where it was at.
zepdrix
  • zepdrix
I guess you can right click on the graph, `show grid`
zepdrix
  • zepdrix
That will make it look a bit similar :o
anonymous
  • anonymous
where is that at?
zepdrix
  • zepdrix
right click your mousey button on the graph. a menu will pop up
anonymous
  • anonymous
oh ok! now what do i do?
zepdrix
  • 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
  • zepdrix
That's probably not necessary though :o lol
zepdrix
  • zepdrix
you are online school or something?
anonymous
  • anonymous
ahahahahahahhahhaahahahha i cant stop laughing :p that was funny. cash moneyyy! lol and ugh yes i am :(
zepdrix
  • 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
  • anonymous
okok! are you getting tired of helping me ;p;
zepdrix
  • zepdrix
Buhaha XD yes!
zepdrix
  • zepdrix
Maybe label them like this or something? :d
1 Attachment
anonymous
  • anonymous
yay! ok i will! helping me haha i think i love you!
anonymous
  • anonymous
thank you for *
zepdrix
  • zepdrix
oh my <:o
anonymous
  • anonymous
ahhahaha! but really..thank you so much! i know that was rough haha
anonymous
  • anonymous
@zepdrix what is the difference between the simple interest and the compound from the graph?

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