Mathematics - 21 November 2007

  ∞
  ∑ [b] / [n² − b² ] =
n=b+1

  2b
  ∑ 1 / [2n]
n=1

2007-11-21 04:45:52 · 1 answers · asked by Anonymous

2007-11-21 04:44:27 · 9 answers · asked by Anonymous

Use the fundamental identities to find the value of the trigonometric function.

Find sec s if tan s = 3/4 and s is in quadrant I.

2007-11-21 04:28:19 · 3 answers · asked by Anonymous

I am still trying to get used to these type of equations, so if you could explain how you did it that would be really helpful.

1.) a+b=ac (a as the subject)
2.) pr-p=qr+q (q as the subject)
3.)pr-p=qr+q (r as the subject)
4.)p(q+r)=q (q as the subject)

2007-11-21 04:18:33 · 6 answers · asked by youlookingood 1

can anyone help plzzz....

2007-11-21 04:09:04 · 3 answers · asked by Johny Z 1

Two jets leave St. Louis at 2 P.M., one traveling north at 850 km/h and the other south at 750/km/h. At what time will they be 4000 km apart?

Answer is 4:30PM.

How can I solve this?

I've written this chart, but I think I did it completely wrong.
--------Rate x Time = Distance
Jet1 = 850 ||| 1 |||||||||||||||| 850
Jet2 = 750 ||| 1 |||||||||||||||| 750

2007-11-21 04:06:11 · 3 answers · asked by Anonymous

1. Write the equation of the line that passes through the points (-5, 1) and (-5,-2). Show all your work for credit.

2. Write the equation of a line in slope-intercept form that is parallel to the line 2x-5y= -8 and containing point (-5, 0). Show all your work for credit.

2007-11-21 03:47:50 · 4 answers · asked by Anonymous

Problem: Last year, Kirsten read one fourth as many biographies as mysteries and eighteen more science fiction books than biographies. The number of Nature books that she read was one less than the difference between the number of mysteries and the number of biographies. If Kirsten read four times as many science fiction books as Nature books, how many books did she read in all?

2007-11-21 03:41:53 · 6 answers · asked by Jopie N 1

The product of two natural numbers is 8400, and their biggest divider is 20, which are the two numbers?

2007-11-21 03:31:08 · 2 answers · asked by Anonymous

x^2-3x+7

2007-11-21 03:29:46 · 7 answers · asked by lele 2

The cost in dollars to print n copies of a magazine is given by the formula, C=-0.000025n^2 + 0.325n

a) Find the average rate of the cost of printing the magazine using the interval from 100 copies to 200 copies.

i try this for part a -

C(100)= -0.000025(100)^2 + 0.325(100)
= -0.25+32.5
= 32.25

c(200) = -0.000025(200)^2 + 0.325(200)
= -1 + 65= 64

so then I try this

64- 32.25/ 200-100

but the answers says---- $.25/copy how do they get this

b) Find the average rate of the cot of rnting the magazine using the interval from 200 copies to 300 copies.

answer = $.20/copy

What is the marginal cost( the cost of printing one extra copy)
after 100 papers have been printed? ( the cost of printing the 101 st copy. answer= $.27

2007-11-21 03:05:30 · 1 answers · asked by Anonymous

2007-11-21 02:51:16 · 12 answers · asked by Anonymous

2007-11-21 02:31:58 · 5 answers · asked by crocsroc 2

You don't have to solve it, but maybe explain me how that works.
Thank you

2007-11-21 02:17:38 · 12 answers · asked by Vinko B 1

2007-11-21 01:57:21 · 10 answers · asked by cmerritt32 2

2007-11-21 01:46:13 · 5 answers · asked by cmerritt32 2

for example: log (base 4) 9x (squared) = log (base 2) (5x-8)

how would i solve this equation

2007-11-21 01:45:22 · 5 answers · asked by Svetlana P 1

2007-11-21 01:34:00 · 9 answers · asked by cmerritt32 2

solve for X

2007-11-21 01:06:23 · 8 answers · asked by BD M 1

What values of a and b exist for this equation?


lim [(x^3-8)\(x^2-4) - (ax+b)] =0
x-> infinity

i don't know how i'm supposed to solve this.
I do know how to solve limit problems but the ax+b
and the =0 is baffling me

please show all your work
thanks!

2007-11-21 01:00:51 · 1 answers · asked by Anonymous

A) Five more than twice a number

B) The sum of twice a number and five

C) Five added to twice a number

D) Twice the sum of a number and five


I thought the answer is D. Why is the answer A? I thought the order of operations was:

1 parenthesis

2 exponents

3 multiply/ divide

4 add / subtract

2007-11-21 00:45:32 · 6 answers · asked by Anonymous

2007-11-21 00:40:58 · 30 answers · asked by govind r 1

One of them is 17

2007-11-21 00:38:58 · 12 answers · asked by greth_jonathan 2

i am at college working on a program but i am stumpted on taking 20% from a number can someone please write out the formula please, thanks rick

2007-11-21 00:13:21 · 10 answers · asked by Anonymous