That homework help thread.

[Hannah]

Pretty self-explanatory, eh? Oodles of smart people who are all smart in different areas means one thing; a kick ass homework help forum. So, have at it.

[RantingSidekick]

I took A2 waay early.

Shiiit ,I knew it shoulda been a quadratic...

...Multiply the quantities together!  That should give you a quadratic. :D

[Xuut]

O.o That is very early...

 

XD Is it the right quadratic? It's a very big quadratic... But maybe it is the right answer? I mean it makes some sense now... Since the Y axis should be the profit. 

 

Holy crap, this might actually be the answer. (The rest is very easy.) 

[EndOfTheEarth]

Every 2 dollar raise per guitar?

If it's per guitar, then first we need to figure out what the current profit per guitar (customer, p) is

45p=$50

p=$1.10

So for each time we raise the profit, we get 2n+1.1 ( where "n" is the number of times raised, because our first number is 0, the profit would be at 1.1 initially, then with 2+1.1, 4+1.1, 6+1.1 and so on added as you go along.)

Then you multiply this by the number of people buying. Keep in mind each time you raise, you loose a customer. So that part would be 45-n (again, the initial case, it started at 45 customers, and each time we loose one)

So your equation for profit if you're raising 2 dollars per guitar is (2n+1.1)(45-n)=profit

When making the graph, keep in mind that 2n is your change in cost (your x axis), with 2(0) being the beginning, and 2(1) being the one after it. Keep this in mind when making your graph. n is the number of times the cost was raised, not the change itself.

 

*headache*

I've been away from math for too long.

[Xuut]

O.o... Wut. It just said price. And each guitar (I'm assuming because logically, 45 guitars are not worth $50) is $50.

 

No... The graph is all weird. Did I mention it needs to be a parabola? And I'm pretty sure it's supposed to be in Ax^2+Bx+C=0 (the zero is sometimes Y) format because the second question was to complete the square. (Putting it into y = a(x-p)^2+q format)

 

[Contradiction]

In your original post, you said profit...

 

EndOf's equation should be a parabola... you just need to expand to get it into ax^2+bx+c form.

[Xuut]

OH. I see what you mean. I have no clue what the hell  it's asking for. All I know is that 45 used guitars are sold at $50 (it never said each though...) and the price per guitar was jacked up, therefore the price itself. 

 

But the numbers are weird... O.o Because the Y-axis is supposed to be the profit right...? 

 

God I hate this question. 

[EndOfTheEarth]

I was using the wrong number. See below.

(Keep in mind though that in the future, you will get terrible numbers like that all the time)

[Xuut]

(XD Just not on this test. We were promised only one question with crap loads of decimals and that was the other word problem.)

[EndOfTheEarth]

*headesk*

 

I read it wrong.

Each guitar is $50

 

So (2n+50)(45-n)=profit

(Or rather -2n^2+40n+2250)

 

Here is the right graph.

http://www.wolframalpha.com/input/?i=%282x%2B50%29%2845-x%29%3Dy

 

My last graph gave data inconsistent with the scenario. The equation makes sense now.

[Xuut]

XD Okay. Thank you. 

 

This makes so much more sense now.  

[Mudkip]

Which country produces more bauxite than any other country? South American country, that is. It's, like, not on the internet anywhere...

social studies teacher, when am I ever going to need this in life?

[nathan_p]

Brazil, apparently.

 

(I googled "bauxite" and found a chart of countries that produce it, then located the South American country closest to the top. Google is your best friend~~)