Mathematics - 31 August 2007

i REALLY need help on this one math problem!!! PLzZZZZ help me!!


simplify the expression, if possible. if not possible, write "in simplest form"

2/3(c-3/4)+c(1+b)

2007-08-31 07:51:23 · 6 answers · asked by cali hollister chick 1

The book states that you use both arithmetic and geometric sequences to solve this. the numerators hav a arithmetic sequence 1,3,5,7.. add 2 AND the denominators have a geometric sequence 2,4,8,16 multiply 2..the book states the formula for arithmetic sequence is a+(n-1)d
and geometric is ar^n-1
the aswer the book gives is 2n-1/2n
i don't get how they got 2n for the demoninator??
2^1*2^n-1=2n shouldn;t this =4n, y is 2()2) not done ???

2007-08-31 07:38:54 · 6 answers · asked by Anonymous

I figured a SD for NFL quarterback Carson Palmer the, last 3 years of Total Yards thrown per year (2004, 2005, 2006).
Mean: 3589.33
Standard Deviation: 496.25
This may sound stupid, but:
Can someone explain the 68%, 96%, & 99.7%? Where i'm getting confused is that 1 SD gives a range of 4085.58 to 3093.08, but his highest year was 4035. is the 68, 96,99 a probability or an actual range of the numbers taken to get the mean?

2007-08-31 07:37:15 · 3 answers · asked by ptfmb71 2

2007-08-31 07:28:39 · 6 answers · asked by clavezza28 2

1. Evaluate:
-cube root 64

2. State which method should be applied as the first step for factoring the polynomial. Factor completely.
4x^2 – 3xy + 4x – 3y
A) Find the GCF.
B) Group the terms.
C) Factor the difference of squares.
D) Use the ac method (or trial and error).

3. Factor by grouping.
35x^3 + 30x^2 – 7x – 6

2007-08-31 07:20:05 · 4 answers · asked by casper5 3

Ok, so I'm starting Cal. 2 and I'm already lost

Given the integral ln(2x+1)dx, how do I get the answer, which is: 1/2(2x+1)ln(2x+1) -x +c?

u = ln 2x+1
du = 2/2x+1 dx
dv= dx
v= x

integral ln (2x+1)= x ln (2x+1) - integral 2x/(2x+1)dx
= x ln (2x+1) - integral 1- 1/(2x+1)dx
= x ln (2x+1) - x + ln |2x+1| + c
then I'm lost....

2007-08-31 07:10:15 · 2 answers · asked by J.W. 2

A.253
B.213
C.57
D.255

2007-08-31 07:03:48 · 17 answers · asked by NONAME 2

I want to derive A = 1/2bh. please tell me how to derive without using parallelogram and rectangle.

2007-08-31 07:02:19 · 2 answers · asked by balaji p 1

i neverreally got how to do these...

2007-08-31 06:45:48 · 10 answers · asked by kissesfromhvn807 2

I had to miss school today because I was sick and my parents wouldn't let me go... and I'm looking over the homework, and there is this question: (I don't want the answer!!!)

-5x
*
[2x -6y]
[4b -8a]

(it's a 2x2 matrix, in case it's hard to tell the entries apart)

My question is this: Is there any more simplified version of -5x * -6y than -5x*-6y ?

Like for -5x * 2x I'm pretty sure that's -10x, but for all of the other entries the only way that I can think of answering them is with the same question like for the 4b entry, the only way I can think of answering that is -5x*4b ... is that what I'm supposed to put? Or am I doing something totally wrong?

2007-08-31 06:32:18 · 5 answers · asked by ChipChamp 4

so on xy axises, the little thing is (-2,0) which one is x and which one is y??

2007-08-31 06:22:09 · 9 answers · asked by kissesfromhvn807 2

Solve by using the quadratic formula.
x^2=x+5

2007-08-31 06:21:15 · 6 answers · asked by dtrain2419 1

Hi! I'm supposed to prove a trigonometric identity with this pile of crap, and I'm not sure exactly what to do. I thought that I had a pretty solid understanding of how to do this, but then I came to this problem! I'm now starting to think that maybe I just lucked out with the past 500+ problems that I did because I can't figure this one out for the life of me! It seems so easy, but everything that I tried just falls short of what I expected. Maybe someone can help!

( 1 - 2cos²(y) ) ' ' ' ' ' ' ' ' ' ' ( sin(y) + cos(y) )
--------------------------- = --------------------------
( 1 - 2cos(y)sin(y) ) ' ' ' ' ' ' ( sin(y) - cos(y) )


Thanks so much! I'll pick a best answer TODAY!

2007-08-31 06:20:47 · 5 answers · asked by Anonymous

If I'm correct, it's 45.82%, right?

TIA

2007-08-31 05:55:42 · 5 answers · asked by Anonymous

To rent a ball field for a game costs a $300 basic fee plus a $2 fee per person. If X persons attend the game which equation can be used to find T the total cost of renting the field......
T= 2x+300
T= 300x +2
T= (300+2)x
T= 300 +2 OVER x
T= (300)(2x)

2007-08-31 05:41:46 · 5 answers · asked by Anonymous

Where is f(x)=cot(x) discontinuous?

2007-08-31 05:39:56 · 2 answers · asked by discovolante 1

1)There are approximately 250 million passenger vehicles registered in the United States. Assume that the battery in the average vehicle stores 440 watt-hours (Wh) of energy. Estimate (in gigawatt-hours) the total energy stored in US passenger vehicles
2) A hand-held video player displays 320x240 picture elements in each frame of the video. Each pixel requires 2 bytes of memory. Videos are displayed at a rate of 30 frames per second. How many minute of video will fit in a 30 gigabyte memory?

2007-08-31 05:37:40 · 3 answers · asked by Anonymous

1. You are given a piece of paper that is 12 inches in length and 6 inches wide. The lower right-hand corner is folded over so as to reach the leftmost edge of the paper. Find the minimum length of the resulting crease.
2. A 40ft ladder is leaning against a 40ft inclined plane with an angle of elevation of 30 degrees with respect to the horizontal. If the foot of the ladder is pulling away the inclined plane at a rate of 5ft/s when the distance of the top of the ladder is 10ft from the top of the inclined plane, how fast is the top of the ladder sliding down the inclined plane?

2007-08-31 05:26:03 · 2 answers · asked by Anonymous

In triangle ABC, tan (angle CAB) = 22/7 and the altitude from A divides BC into segments of length 3 and 17. what is the area of triangle ABC?

2007-08-31 05:17:53 · 2 answers · asked by Anonymous

A company charges a $60 per day plus $0.50 per mile for truck rentals. If mark rents a truck for three days anddrives it a total of 150 miles, what will the company charge?

2007-08-31 05:16:59 · 11 answers · asked by Anonymous

I will be using excel, for one. But the main problem I have is that I'm not sure how to divide the data. Here is the question, "Make a pie chart for each airline, each representing the percent of flights from each city for that airline." I have a list of five cities, each with two different airlines going to them. I know the total number of flights, the number of one time flights, and the number of delayed flights. Any ideas?

2007-08-31 05:14:37 · 2 answers · asked by Kiko 3

integration answer is wanted

2007-08-31 05:09:16 · 2 answers · asked by Anonymous

1.A picture on a wall is 2ft high and 1ft above the eye’s observer. At what distance from the wall should the observer position in order to have a maximum subtended angle on the picture?

2.Approximate sin(3.14159) using differentials correct to 5 decimal places.

2007-08-31 05:09:02 · 1 answers · asked by Anonymous

(x^3-6x-5)=0

2007-08-31 04:53:30 · 6 answers · asked by Jan1ce 1

what tike was required to travel that distance?

2007-08-31 04:46:58 · 7 answers · asked by Azeez A 1

2007-08-31 04:43:10 · 9 answers · asked by Azeez A 1

4 log 3 - 3 log 4


I forgot how to do these! Also what buttons do you press on a TI-84 calculator to figure this out? Thanks.

2007-08-31 04:38:30 · 4 answers · asked by footballgrl 3

1. (2x^2+5x-1)-(8x-3)
2. X axis is? 3x+2y= -10 and x-4y=6
3. Solve x^2+10=7X

Please help

2007-08-31 04:32:25 · 2 answers · asked by severedangel1776 1

2007-08-31 04:30:42 · 5 answers · asked by Anonymous

2007-08-31 04:13:56 · 8 answers · asked by Anonymous