BOB

Probability was a difficult unit. I dont know what exactly my muddiest point is but all I know is that I always get confuse what to use for every question. Each question has its own technique to answer them. Good luck everyone!

Probability

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Tomorrow's scribe is Precious..

BOB

Okay, for the combinatorics unit, my muddiest point are the circular permutation and the card problems. I freaked out when I see these kind of problems and don't know what to do. I am really confuse when to use the pick and choose formula though I know the rules. Even though it seems like an easy question, I totally messed up. I simply don't like this unit. =p

Good luck everyone!

Permutations

Hey guys! It's Sharmaine and I'm the scribe for today. It's my first time using slideshare for my scribe post, so I hope it'll help.

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Next scribe is... Precious.

BOB

Okay, I thought this unit was easy not until Mr. K introduce the natural log. I think my muddiest point are the word problems especially the half-life ones. I get confuse which formula to use. Sometimes I make mistakes with using log or ln in solving for x. The change of base law is pretty easy and the one when you need to solve for x that was an exponent and they have to be in the same base. Good luck everyone!

BOB

In this unit, I found the double angle identities more difficult than just proving and solving for x. I get confuse of what identities to use. Sometimes I still made small mistakes with proving and solving for x or by doing the factoring that made me screwed up the whole thing. I just hope I'll do well in the exam tomorrow.

Flickr Assignment

This is my flickr assignment.

Blogging on Blogging

Okay..In this unit, I'm a little confuse of graphing f^-1 (x) and 1/f(x). I always do it the other way. Sometimes, i reflect my graph using y=x instead of finding the reciprocal graph. I'm also having a hard time with the problem solving questions but as Mr. K gave us time and let us practice with these questions, I'm getting used to solving it. Well, I think that's it. I'm okay with stretches and compressions of the graph, even and odd functions. I guess I'll do well in the exam if I keep practicing solving the inverses and reciprocal questions.

Group 6: Sea Port Function

At a sea port, the depth of the water, h meter, at time, t hours, during a certain day is given by this formula.

h(t)=1.8sin[2π(t-4.00)/12.4]+ 3.1

(a)State the: (i)period=12.4 (ii)amplitude=1.8 (iii)phase shift=4.00

(b)What is the maximum depth of the water?
3.1 + 1.8 = 4.9
The maximum depth of the water is 4.9m.

When does it occur?

h(t)=1.8sin[2π(t-4.00)/12.4]+ 3.1
4.9=1.8sin[2π(t-4.00)/12.4]+ 3.1

Let θ = 2π(t-4.00)/12.4

4.9=1.8sin θ + 3.1
1.8=1.8sin θ
1 = sin θ
1.5708 = θ

(12.4/2π)2π(t-4.00)/12.4 = 1.5708 (12.4/2π)
t-4.00 = 3.1
t=7.1
The maximum depth of the water occurs at 7:06am.

(c)Determine the depth of the water at 5:00am and at 12:00noon.
h(t)=1.8sin[2π(t-4.00)/12.4]+ 3.1

For 5:00am
h(5)=1.8sin[2π(5-4.00)/12.4]+ 3.1
= 3.9735
The depth of the water at 5:00am is 3.9735m.

For 12:00noon.
h(12)=1.8sin[2π(12-4.00)/12.4]+ 3.1
=1.6766
The depth of the water at 12:00noon is 1.6766m.

(d)Determine one time where the water is 2.25 meters deep.
h(t)=1.8sin[2π(t-4.00)/12.4]+ 3.1
2.25=1.8sin[2π(t-4.00)/12.4]+ 3.1

Let θ = 2π(t-4.00)/12.4

2.25=1.8sin θ + 3.1
-.85=1.8sin θ
-.4722 = sin θ
-.4918 = θ

(12.4/2π)2π(t-4.00)/12.4 = -.4918 (12.4/2π)
t-4.00=-.9706
t=3.0294
The water is 2.25 meters deep at around 3:00am.


Group 6 Members: Luis, Joe, Sharmaine, Precious, Ivanna, Roslyn
Correct me guys if I'm wrong.

Unit Circle

Hey guys!(: To start off my post, Mr. K was away today but as usual there's a substitute teacher. We had our first quiz on Circular Functions. After we finished the quiz, the sub handed out a worksheet called "Working with the Unit Circle". Together with the worksheet, we were also asked to do Exercise 5, questions 11-20.

Don't forget to finish the worksheet and hand it in tomorrow morning! (:

Next scribe is Jessica!