Who wants to do Calculus?

[maiku]

All said 'n done. End thread!
Thanks everyone who helped out!

[GeezerSi]

You're bad. Do it! You won't learn it if someone else does it for you.

[ethlar]

I wish my math class was like that, Diferential equations blows

[CameronJr9]

I took one look at that test and nearly threw up from laughing. I suck so bad at complex math.

[maiku]

Originally Posted by GeezerSi

You're bad. Do it! You won't learn it if someone else does it for you.

I try to do it, but the algebra parts usually mess me up the most. It's important so I'd like to at least check my answers. I'd have to work them out again anyway to make sure it's done the way he tought us. It always makes sense when I see him do it in class, but then I get home to do the work and I'm like...

[marc-o-lishuz]

statistics ftw! lol

[Sli(ks]

I'd be careful about posting exams online, I've been told a few times not to do that, and that they check for that somehow.

But then again they also tell me not to use Wikipedia, cliff notes, or tape record lectures - and I do all three regulary lol.

[ethlar]

unfortunately it looks like its the first and second derivative tests and maximization/minimization problems. Those are a lot more algebra than they are actual calculus.

[Kakashi]

if youre asian and youre bad at math you fail @ life.

no wait, you just fail to be stereotypical.

[maiku]

Originally Posted by Kakashi

if youre asian and youre bad at math you fail @ life.

no wait, you just fail to be stereotypical.

That's more like "if your Chinese and you're bad at math you fail @ life"
lol. luckily, I'm not chinese, so I guess I can still live w/ purpose.

[jc21]

lol, math.

I'll help you out. I should warn you though that i took math six times in 3 years in high school. That means 3 years of math in school and 3 straight years of math in summer school.


When we hit imaginary numbers i stood up and told the teacher I simply did not have the imagination to handle such math problems. I walked out of the class and quickly changed my diploma to a business diploma instead of just general education. Best decision i ever made.

I should also inform you that i took math 40 in college... and got a C. But like i said i'm more then willing to help.

[maiku]

Hmmm... I think I got this other problem worked out...

[jc21]

oh that's easy shit. A squared plus b squared equals c squared

[jc21]

x= the square root of 25 which is 5

[CaliGuy]

Texas Instruments TI83 is your friend...

[jc21]

pythagorean theory FTW

[The Shishpanik]

For numbers 1 and 2, get the second derivative of both, and find where f''(x) (i.e second derivative) is negative or positive -> negative is where it's concave down, positive is where it's concave up. And to get the inflection point set f''(x)=0.

I won't give away any more.

[maiku]

Originally Posted by The Shishpanik

For numbers 1 and 2, get the second derivative of both, and find where f''(x) (i.e second derivative) is negative or positive -> negative is where it's concave down, positive is where it's concave up. And to get the inflection point set f''(x)=0.

I won't give away any more.

Yeah, 1, 2, and 3 are about the only ones I think I got figured out. 3 is being a little tricky tho. I screwed up one of these problems before because I was reversing the amount of fencing w/ the amount of area. The other one's I'm still playing with. I can get most of 6 since we did one similar in class..

[Kakashi]

Originally Posted by maiku

That's more like "if your Chinese and you're bad at math you fail @ life"
lol. luckily, I'm not chinese, so I guess I can still live w/ purpose.

excuses excuses..

[tomasro]

Well, I haven't done a lot of math since I got out of college, so this was a fun challenge for me. I'll give you what you need to do for 2 of them:

#3) Make an equation for the problem actually is (x+x+x)+(x+x+x)+y+y=240
...3x+3x+y+y=240
...6x+2y=240
And then figure what the Square footage equation is:
...L*W=SF
...(x+x+x)*y=SF
...3x*y=SF=f(x)
...3x*y=f(x)
To solve this problem you must solve 6x+2y=240 for y, and then plug that into the Square Footage equation to create your final equation. Find the maximum of that equation to find your maximum volume, and then replug those solutions into the original Square Footage equation to find y. Then you are done with this problem.

#5) Similar idea to the above problem. You've got the Volume of the can, not the radius, not the height, nor the volume. The volume is a function of both radius and height, so you'll need to solve the surface area equation for height, and plug it into your volume equation. The rest is the same as the above equation.

I hope that helps a little. I don't really feel like doing all your homework...cause the point is that you figure it out on your own, from which you will learn the material. I hated homework too, but it's better than being given an assignment at work, and not knowing what to do, and then getting fired because you were wrong. Think of homework as practice for the real world. You may get lower grades if you don't get it right, but as long as you try and find the correct answer, you'll be farther ahead of everyone you know in ways grades can't measure.

Good luck!