Assignment #30?

can someone please tell me what tonight's homework is? i left my assignment sheet as school on accident and it's not on mr. karafiol's page.

thanks

Notes from 4/30/07

Could someone please put up any notes that he or she took in class today? I left early sick and I would really like to get them. Thanks.

Problem 36

I tried to graph the curve and I cannot find the local maxima and minima, can some one help me please?

homework

can someone explain to me how to do 10.1 #28, 54 and 55
thanks
mel

I wasn't here on friday and I am having trouble understanding the questions about projectiles. Did we go over this in class and can anyone explain it to me?

28 (18)

the first 28 means 18, right?

i still don't really understand how to figure out the parametric equations for a circle-- it's something involving sines and cosines i think? if anyone knows what i'm talking about/ can explain it to me, that would be great. thanks.

#56

How do you figure out how far the ball will reach and if jill will be able to catch it at the same time? Also, what is a trochoid and a hypocycloid?

Review #1

I forgot how to simplify this one can someone help me out

Eliminating the Parameter

Could someone explain how to find equations for problems like 10.1#21-#24 to me?
Thanks.

10.1 #22

Some kind of elipse?

10.2 #49

can anyone explain #49 to me? i remember we did an example like this in class, but i forgot how to solve it.

answer to isabel

i don't know how to graph simultaneously but you can use the trace to tell if the graphs collide. when you get to the intersection of the paths, use the up and down buttons to see where the particle is at the same t.

Friday's Lesson and #41-47 odd on the hw

Could someone summarize the gist of anything new you did on Friday?
Also, I don't really get how to do the section in the homework with 41-47.
Thanks

#28 Hints?

I need some help figuring out how to prove this. Thanks.

final draft

when is the final draft due again

PSAE

if any junior wants to borrow an 83 for the PSAE, just ask tomorrow.

blogging schedule

is there actually a blog due today?

pretest

from the pretest I want to ask how to do number 6, 12 and 13. thanks
mel

ACT

Does anyone have a good list of helpful equations we may have forgotten, for use on the ACT, besides the obvious. Anything interesting or things that can be handy witht the 83. If I have anything I will post it today or tomarrow.

#5 on pretest

Can someone explain how to draw added vectors. Do you add the angles, slopes, lengths, or what?

More about ACT

Another thing about the ACT is to come in there with high intensity. This may sound a little silly, but based on the length of this test, the moment you start losing interest, you miss out on a lot of easy things that you should get right. Last year I almost fell asleep on the reading section, needless to say I only got 23 on it when my other nscores were 26, 27, & 31. It can definitely affect you. When they say get a good nights sleep, they are telling the truth. I really hope everyone does well, because a high ACT score means so much for college, but it is still just like any other test. If you're into it mentally, you can't help but excel.

Number 12 Pretest

Does someone have a quick explain they could lend me for number 12 on the chp. 9 pretest?

ACT Tips

Here are some act tips courtesy of mr lyons!


Strategy:
-Take practice tests to find your strengths (your favorite type of passage. During the test, attack them first. Example: I am strongest at Experiments/Research so I will find the 6 question passages and start with them)
-Start with those passages, then move to your second favorite. Then the third type.

Reading a passage: (answering questions)

1. Skim the passage (No more than 1 minute!)

Main points, no details yet.
1st and last sentence in each paragraph
Looking for what is available and approximate location
NO interpretation

2. Read Questions

What is the question asking?
Underline Important words like 'not', 'least/greatest', 'lowest/highest'
Identify kind of question:
(these increase in difficulty, but all are worth the same points!)
-Understanding: Looking up a value or reading a data point, finding a phrase in a passage. Example: 'During the month of may, what is the concentration of NaCl in the water?'
-Analysis: Describe relationship, explain results. Example: 'By looking at the monthly trend, the results of this study showed the concentration of NaCl… (decreased during the summer months and increased in during the winter)
-Generalization: Apply information to new situation. (Predict, Extrapolate) Example: 'If this scientist measured the KCl concentration in the winter to be 1.2 g/l, which of the following would you expect? (KCl should be lower in the summer, KCl should be more similar to NaCl than the other contaminates)

Do generalization questions last, you have to concentrate on specific sections determined by answering the understanding and analysis questions first. You may then have enough of a feel for the passage to answer the generalization question without reading the entire passage.
If you can answer all the questions without any 'extra' reading, you've saved some time! You don’t get points for reading, only answering.

3. Eliminate obvious wrong answers:

Some you are sure are incorrect.
They may contradict data (claiming an increase where the data show it decreases)
There is no relation or nothing stated in the passage

4. Choose your answer:
Look for the most correct answer. You may not like any of them, but one should be most correct (or least incorrect.)
Choose something. There are no penalties, and you have eliminated some choices.

General

That test was no fun, and I have a question, but I can't ask it. Oh yeah, I realize that I never fully understood how to do the problem wiht the slope on an incline, i think it was 9.3.62. Maybe someone could help w/ that?

Don't post on the test yet

Since not everyone has taken it.

== pjk

Handshakes/Fencing and Angles in a regular polygon

I have to remember this all the time for fencing, so I'm going to do this in a fencing context. ]

Notes on terminology:

One round of fencing against a single opponent is called a bout. A pool is a group of usually seven fencers who fence each other in the first round of a tournament to determine where they are ranked for the second part of the tournament

To find out the number of bouts there are in a single pool, apply the equation:

n(n-1)/2, where n is the number of fencers in a pool.

Here's why:

Let's use the seven-fencer pool example, we'll call them fencers 1-7. Each fencer must fence everyone else once, not including themselves, so each fencer fences six bouts. If there are seven fencers, that means one would multiply the number of bout per fencer by the number of fencers, 6*7, or n*(n-1). But, if one were to do this, they would count each bout twice, since one would count fencer 1 vs. fencer 4 and fencer 4 vs. fencer 1, whereas in reality there is only the 1 vs. 4 bout. So, divide n*(n-1) by 2, giving you:

n*(n-1)/2


As for the second part of Casey Blue's question

This will be so hard to do without being able to draw you a picture, but follow me as best as you can. I'm going to use a pentagon in my example supplemented by variables, where n is the number of sides.

Begin with a regular pentagon inscribed in a circle. Then draw radii from each point on the circle to the center. Since it is a regular pentagon, the angles between each radius are equal, so divide 360 by 5 (360/n) to find the central angles made by the radius, which comes out to 72 degrees. Now, what you have is 5 isosceles triangles (since the legs are radii) with non-base angles (what's the proper word?) of 72 degrees. Isolate one triangle for now. To find the sum of the base angles, which will be equal to the interior angles of the pentagon (since one base angle is 1/2 of the measure of the interior angle of the pentagon), subtract 72 from 180 (180-360/n). That gives you an interior angle of 108 degrees. To find the sum of the interior angles, multiply by 5 to get 540 (180n-60).

So, the general formulas are:
For an interior angle
180n-360

For the sum of interior angles
180-360/n


(OMG! I actually did a blog entry!)

Handshakes

In preparation for the ACT...

Does any one remember the handshake formula that we learned last year?

Also: what's the formula for the degree of each angle in a regular polygon (based on the number of sides)?

Thanks

homework?

there's no homework for tomorrow right?

p.s. anyone know where i can get a TI-83 for the ACT this week?

paper

man that paper was hard, i dont think i fully understood what we had to do for most probs

Answer to the 8a Question from Elena

The power is raised to the m-1, because of the time that the money is invested. I know this sounds confusing, but give me a second. Take a look at the chart, the first payment is a very "young" one, being that it has not been maturing in the investment for any time. Hence, the payment is not effected by interest. There for what ever period of time that the money is invested has to be decreased by one to account for the one year without a growth through interest.

Can someone please help with #4?

I tried doing it with my calculator and waited about half an hour and then decided to give up.. n e one got a better way?

Typo?

Well number 8a says m to the h power where it should be just "mth" right?

9.4 13,15,17

My answers are way off on these problems, I think I'm missing something.

2c response

If you look at the given formula for geometric series (the third on the front page) it tells you how to do 2c. r equals a2 divided by a1, which is equal to the reciprocal of the percent.

Writing project # 8

For #8a. I know that the formula is 500,000/(1.075)^(m-1) but I don't understand why the interest rate is raised to the m-1 rather than m. If m payments were made, why is the interest raised to the m-1 power?

writing project #8

quick question about #8...is the m^h payment referring to the future payment? and this question is just asking for a generalization of the formula used for 6 and 7 right?

Answer to Dylan

if u just use the summation feature on ur calculator (sigma) it makes it alot easier

2c

Is there a simpler way to do problem 2c, rather than computing all 20 numbers and just adding them together?

Typo-riffic

I bet all of you steller workers out there have already finished the paper, but for those of you who haven't (assuming there are some others besides me). It might help you to know that there is a typo on the assignment sheet. On the table on first page, instead of 2025, it should say 2027.

Geometric Series Paper

Does anyone understand how to get #10 for the paper?

# 3 on writing assn

I think I screwed up my formula for # 3a. could someone lead me in the right direction?

Projection and Parallel

I'm having trouble doing the problems on projection and don't understand the book's explanation. Can someone explain how to do this? Also, the parallel ones aren't working out for me either. Thanks

absent

hey guys i was absent monday and forgot to ask mr. karafiol...which review problems were part of the homework for today (or were all of them due)?

vectors

does anyone understand how to multiply vectors?

SAT II Packet

Is the SAT II Packet Due today when we get back? Im not sure when it is due!

Number 5 SAT

Looking over an SAT prep, I wasn't sure after drawing the picture of the triangle and getting arctan of x is (sqrt of 1-x^2)/x what to do? This is question #5.

blog??

not sure if we have to do one for today but here it is anyway

Homework...

Does anyone know what homework is due tomorrow?

What Part is due?

I know Mr K usually gives us these assignments as kind of "somewhat opptional", like the winter brek thing too, but does anybody know wut part is going to be graded, wut part is extra credit etc etc?

Questions on the Review Packet

I have questions for number 13 and number 47. Thanks
Melissa

SAT-II #46

Question 46 is the rediculous logarithm problem, that I found very hard to concentrate on and sort of annoying. I got (c) for the answer but it was half guess and half math because I couldn't get the expression they gave to simplify to the same sort of answers they were giving. Did anyone successfully do this problem?

SAT II Practice Test

I don't really know how to approach #26. I think the way it's worded is what's confusing me. Does anyone understand how to do it? It seems like one of those trig problems where we get like sixteen solutions, and this one looks like it's only asking for one of the many solutions... but I'm still not sure.

Also... for #38: does anyone know how to use the nCr tool on a TI89? I did this the long way...