Mathematics - 22 November 2007

My math teacher is like this. He always arrives in the classroom a few minuts before class and kind of "hangs out" with the students and talks to them about random stuff. During break and after class he will also talk if anybody wants to talk, about maths or anything else. He usually starts a lesson by writing a headline on the board, describing what we've been working on, then invites the class to tell him something about the headline. He sums up what people have said and then points to a problem that we can't solve or a situation we haven't considered. Proofs for all theorems are worked through, allowing any and all questions during the proof and always answering them fairly. He will allow the class to take the proof a different way than the textbook if he can see that the proof will work using a different approach. He always asks us to think about the possible next step, and asks us to consider the proof as a whole. Continued in "details"...

2007-11-22 23:05:31 · 10 answers · asked by Todd 1

ok i have just got my card reader from barclays, and after playing with it, I think it must work by useing certain numbers stored on your chip and applying them to a function to give a number, and each sucesive time the number increases so i assume it must have a internal clock which alows the number to be diffrent every time, but can any of you smart boffins out there work out the maths, just so i dont have to carry the bloody thing arround with me every time i want to log on, I mean i can just store a series of pre worked out numbers but i guess that defeats the point!

2007-11-22 22:58:51 · 3 answers · asked by Mark R 2

I am really confused about binary numbers, could someone help me with this question please. If a binary number needs to represent 16 different values, how long must the number be in bits ?

2007-11-22 22:56:55 · 3 answers · asked by Anonymous

The answer should come out in brackets, help please!!??

2007-11-22 20:21:19 · 8 answers · asked by Info team 2

I need the answer, should come out in brackets. Help please!!

2007-11-22 20:19:31 · 9 answers · asked by Info team 2

Please help!!??

2007-11-22 20:17:50 · 5 answers · asked by Info team 2

2007-11-22 19:57:34 · 15 answers · asked by suri 1

2007-11-22 19:18:41 · 11 answers · asked by Ashley 2

2007-11-22 18:44:01 · 6 answers · asked by ~*~ 1

A flagpole is perpendicular to the horizontal but is on a slope that rises 10 from the horizontal. The pole casts a 43-foot shadow down the slope and angle of elevation of the sun measured from the slope is 36 . How tall is the pole? Round your answer to the nearest 0.1 foot.

Thanks.

2007-11-22 18:06:18 · 2 answers · asked by labelapark 6

Is it y=cos5x or is it y=5cos5x or is it something else?

2007-11-22 17:38:08 · 9 answers · asked by ~*~ 1

Two surveyors 180 meters apart on the same side of a river measure their respective angles to a point on the other side of the river and obtain 54 and 68 . How far from the point (line-of-sight distance) is each surveyor? Round your answers to the nearest 0.1 meter.

Could someone please explain how to solve this? Thanks.

2007-11-22 17:23:18 · 3 answers · asked by labelapark 6

Suppose you bought a book that was priced at $6.95, and the total bill was $7.61. What is the sales tax rate in this city?

2007-11-22 17:15:17 · 6 answers · asked by Anonymous 2

k my math teacher is such a jerk he comes in before class and talks to the students about random stuff then starts the class by writing a headline about what we've been doing last time and asking us what we know about it. So some students say different things and he sums it up and points to a problem that we don't know yet or an element we haven't covered yet and then he like leads the class through a proof or an example and asks us what we think happens next and like asks us what we think about that proof and where the big ideas in the proof were. Then he runs through an example and sets the good students a problem they can work on in class while he does another example for those who needs to see another example before they get to work on the problems too. He sets alternative harder questions people can choose to work on instead if they want to. He always allows questions to be asked and always answers them. He never sets reading homework and still everyone learns math. WHAT A JERK!!!

2007-11-22 17:14:32 · 6 answers · asked by Todd 1

Find the length of the other base of a trapezoid height is 16m, one base is 20m and the area is 224 squared. Find the base of the other base.

2007-11-22 16:54:27 · 6 answers · asked by Syl 2

Two trains leave a station at the same time on straight sections of track which form an angle of 112 with each other. The first train, a freight train, travels at 52 mph and the second, a bullet passenger train, at 106 mph. How far apart are the trains, correct to the nearest 0.1 mile, after one and a half hours?

How do I solve this? Thank you.

2007-11-22 16:37:54 · 4 answers · asked by labelapark 6

Help please.... Thank you.

2007-11-22 16:20:15 · 6 answers · asked by Michele 1

I need to know how to turn something into a percent. for example: my paycheck is 1060.80 and they took 159.98 out of it for taxes. What percent of 1060.80 is 159.98? And could you please tell me how you came to this conclusion please. What would the formula be for figuring this out?? I'm having a serious brain fart.

2007-11-22 15:37:00 · 2 answers · asked by Anonymous

The annual rainfall (in inches) in a certain region is normal distributed with mu = 40, sigma = 4. Over next 5 years, what is the probability that there are two years having a rainfall of less than 35 inches?

2007-11-22 15:29:08 · 2 answers · asked by Anonymous

The angle of depression is 30 degress. How far away is the bear form the base of the tower?

2007-11-22 15:08:57 · 4 answers · asked by kageepan_k 1

What angle does the ramp make with the ground?

2007-11-22 15:00:41 · 6 answers · asked by kageepan_k 1

2007-11-22 14:47:38 · 7 answers · asked by angela xynese 1

1. The least common multiple of 3, 4, 6, and 8 is

A. 8 C. 72
B. 24 D. 96

2. You’re planning to buy a boat, a motor, and some miscellaneous boating equipment. The boat costs $325, the motor costs $225, and the equipment costs $79. If you’ve saved $438 toward these purchases, how much more do you need to save?

A. $181 C. $281
B. $191 D. $291

3. Write 1,386 as the product of its prime factors.

A) 2 x 693
B) 2 x 3 x 231
C) 2 x 3 x 7 x 33
D) 2 x 3 x 3 x 7 x 11

4. 45 – 15 – 15 =
A. 0 C. 15
B. 1 D. 30

5. At a local store you find the following prices listed:
Cellophane tape. . . . . . . . . 2 rolls for $1.28
Note pads . . . . . . . . . . . . . . 3 pads for .87
Highlighters . . . . . . . . . . . . . 1 for 1.59
Ink cartridges . . . . . . . . . . . . 2 boxes for 1.98

6) How much would you pay for one roll of tape, two note pads, two highlighters, and two boxes of ink cartridges?
A. $4.50 C. $6.38
B. $5.72 D. $8.07

2007-11-22 14:42:52 · 4 answers · asked by Teachers Aid 1

urgent, please help

2007-11-22 14:24:41 · 4 answers · asked by weasel 4

The pitch of a roof is its slope. If the roof is 20 feet long and 5 feet from its base to its peak, what is the pitch of the roof?

2007-11-22 14:14:45 · 6 answers · asked by CG ~!~ 2

thanks

2007-11-22 14:03:02 · 6 answers · asked by germanmonkey1 1

OKAY! This is SERIOUSLY bugging me. I can just BARELY get the answer with barely understanding wtf I'm doing.
When you're trying to factor a function is it basically trial and error when it's not a perfect square???
Also, how do I put -5t^2+20t+50 into mx+b to determine the time?

2007-11-22 13:49:27 · 4 answers · asked by Bo 3

2007-11-22 13:47:35 · 5 answers · asked by samurai 1

1.(a)For the quadratic y = x² - 6x – 27 ,( without using your graphics calculator)
(i) factorise by inspection and find the x intercepts
(ii )find the y intercept
(iii)find the coordinates of the vertex
(iv)find the minimum value

(b)For the quadratic use your graphics calculator to find, (correct to 2 dp) [Using X min =-6.3 X max 6.3 scale = 1, Y min = - 6.2 Y max = 3.1 scale= 1]
(i)the x intercepts
(ii)the y intercept
(iii)the coordinates of the vertex
(iv)the minimum value
2.
(i)Simplify leaving your answer in surd form with an integer denominator.
(ii)Simplify leaving your answer in the form .
(iii)Simplify 2(5 - 3i) - 3(7 -4i) into the form a + bi
(iv)Simplify ( 2 – 3i) ( 5 + 2i ) into the form a + bi

3.Use the discriminant to find how many zeros, and if real or imaginary, for the quadratic y = 4 -5x +2x²

4.Solve, using the quadratic formula, the exact solution(s) to x² - 6x + 13 = 0

PLEASE HELP ASAP!

2007-11-22 13:32:09 · 2 answers · asked by Jessa 2

2007-11-22 13:12:35 · 3 answers · asked by muhammad sharif 1