how to get a 300

[smeag]

can someone tell me how to do the solids of revolution problems? I am barely learning calculus...

[Shawn]

Post a specific problem off a UIL test and what calculator(s) do you use?
You use the following forumlas:
Around X-Axis or Line y=a
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Around Y-Axis or Line x=a
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You probably need to post a few questions though, if this explanation doesn't work.

[smeag]

wait, did you say it was an extra 25 points? I thought it was 21 points because 7 x 3 = 21.

[007math]

[BlasianAsian]

[unparseable or potentially dangerous latex formula] for emphasis?

I like it. =D

[007math]

Actually, it's [unparseable or potentially dangerous latex formula].

EDIT: Yay, I am happy now.

[BlasianAsian]

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[unparseable or potentially dangerous latex formula] [unparseable or potentially dangerous latex formula] [unparseable or potentially dangerous latex formula] [unparseable or potentially dangerous latex formula] [unparseable or potentially dangerous latex formula]
Fine.

Happy now?

[smeag]

ok, how long should I take on the numericals, to make sure I have enough time for the rest? As of right now, I am around 13 - 14. I just want to know how much of my time I should decrease to have room for most of the stated and geo..

[007math]

Depends on how much you can do. If you can do all the stated and geometry that you can do in 16-17 minutes, then that's good. Over time, you will naturally get faster at the number crunchers and that 13-14 minutes will cut down to 9-10 minutes giving you plenty of time to work the stated and geometry. You do want to be doing crunchers in about 10 minutes ideally (unless you can get perfect accuracy with 13-14 mins and complete most of stated/geometry). It depends on your speed.

[BlasianAsian]

I suggest 10-11 min. Cut it down. But if you can't maintain an almost 100% accuracy on the number crunchers, then it isn't worth it. Think about it. You spend like 5 min on one of those stupid solid of revolution problems, and then you miss one number cruncher, then it's just like, "NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!"

RAAAAAAAAAAAAAAAAAAAGGGGGGGGGGEEEEEEEE!

>.<

[Shawn]

A solid of revolution does not take 5 minutes! I promise you. The 9-11 range is about right, obviously you need to be accurate, but in the end there is one of two cases. Too much time not enough knowledge or wrong knowledge causing not enough time. If someone puts an SR up, I will gladly post how to do these problems (and not take 5 minutes).

[nsguy1350]

Solids of revolution aren't bad. Just determine whether you have to use the disk/washer method.
The bad SR problems are when you need to determine the limits, and you have to use the washer, and all that stuff. The are ones that are easy though.

[BlasianAsian]

I have no idea what you just said.

Oh well. Day before regionals? Let's see...

Pack, bubble #, and relax...

That's pretty much it!

I give up. No more studying. What happens, happens.

[smeag]

how do you guys usually do number 56?

[smeag]

can someone please help me on test 2009 E? Here are the questions: 26, 27, 28, 36, 37, 38
also, for number 47, I tried to type (0, 78) (1, 83) (2, 91) (3, 94) (4, 103) (5, 109) then I did linear regression and got 64.3 days

[Shawn]

Probably a good idea to make a new thread, but sure:
26)
Compound interest
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27)
Pretty simple, take equation plug stuff in and solve
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28)
Closest approach is going to be when radii align, so
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[unparseable or potentially dangerous latex formula] km convert to miles
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Percent change(48653364.4,423000000)
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36)
Volume of Water/Volume of Earth
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Earth is sphere with radius 3960 miles
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37) Scaling with a unit conversion
First scale:
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Then take this to volume and then weight:
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Weight=Volume*Density
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Take to lbs
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38) This problem has always been confusing, but I think how the process works is that you add 1/2 of "pure mixture" to 1/2 of "1/2 mixture", resulting in 3/4 mixture. Therefore, you dilute it by 3/4 each time. It gets you the right answer, so I think I am right. (Imagine it overflowing but equally mixing).
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To get below 7 times
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47)
Your mistake is you neglected the days to write the first 78 days. You can use your data set, but you have to either add your answer to 78/m or 478/m. Also you will need to use a more precise value (include more decimals on your answer) for the intermediate calculation if that is how you want to go about it. I recommend just dividing total pages by m.
Same linear regression set:
Equation:
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So either:
1)
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2)
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[Shawn]

[iluvpink]

Ok.
I think to get a 300 in Calculator, you just have to STUDY!
STUDY a lot. I am not at a 300 yet but I am still studying...

[smeag]

can someone please help me on problems 49, 50 on 2009 test E?
These are usually the geometry problems that I find no way to solve...