Mathematics - 4 October 2007

2007-10-04 23:45:54 · 3 answers · asked by keekee2977 1

I need the correct weight for postage costing

2007-10-04 22:50:01 · 8 answers · asked by Anonymous

measuring area. x=L, x+1=W

2007-10-04 22:24:45 · 11 answers · asked by ET 1

A fair coin is to be tossed repeatedly. For integers r and s, not both zero, let P(r,s) be the probability that the total of r heads are tossed before a total od s tails are tossed so that P(0,1)=1 and P(1,0)=0.
Explain why, for r and s greater than or equal to one that: P (r,s) = 1/2P(r-1,s) + 1/2P(r,s-1)

2007-10-04 22:00:44 · 3 answers · asked by polyspaston 1

Find the values where 2 + cos2x = 3cosx in the interval [0, 2π] (i.e. including 0 and 2π) ... i tried about a million different things and now i've got a head ache.... please help ^^

p.s. i know the answer is 0, π/3, 5π/3, and 2π, but i did that graphically and i need to do it algebraically.

2007-10-04 21:53:44 · 6 answers · asked by Anonymous

Ok i have maths problem involving fractions. Here is the question:

Table mats are 3/8 of a cm thick.
a) How tall would a vertical stack of 40 of these table mats be?
b) A box is made to store the table mats vertically. The box is 24 cm high. How many table mats will the box be able to store?

I know that question (a) is asking me to find 3/8 of 40 but i dont know how to do question (b). Can anyone solve this? if so could you please show your workings out so that i know how to do it. thanks.

2007-10-04 21:42:23 · 10 answers · asked by Anonymous

2007-10-04 21:07:01 · 5 answers · asked by best-doctor 2

2007-10-04 20:41:05 · 4 answers · asked by best-doctor 2

Determine whether the series is absolutely convergent, conditionally convergent or divergent.

summation from n=1 to infiniti
[(-1)^n]/(arc tan (n))^n

2007-10-04 20:26:53 · 2 answers · asked by nerdoman@sbcglobal.net 1

Combine: 3√48 - 12√75 + 4√12

2007-10-04 20:24:02 · 3 answers · asked by sara 1

Pi is an irrational number so it has an infinite number of digits. So is it absolutely certain that every sequence of digits occurs somewhere in pi?

Is there a string of one hundred straight 5's somewhere?
Without computing pi to trillions of digits, can it be proven that it contains this sequence of digits?

2007-10-04 20:08:06 · 6 answers · asked by Jeffrey K 7

Can someone show me how I would solve this?

2007-10-04 19:54:33 · 8 answers · asked by Anonymous

Do you think that one day someone will find a polynomial type formula that predicts the nth prime number? Or is there no pattern to them.

2007-10-04 19:43:08 · 3 answers · asked by Bender[OO] 3

A train leaves the station traveling due east at a rate of 45 miles per hour.
A second train leavesa diffferent station an hour later traveling due west on the same track, going 60 miles per hour

If the stations are 255 miles apart, how many miles from the halfway point between the stations will the trains collide?

A) 0 B) 5 C) 7.5 D)12.5 E) 25

PLease help! I dont know where to start.... thank you!!!

2007-10-04 18:55:26 · 2 answers · asked by Anonymous

center= (-1,1)

2007-10-04 18:53:56 · 4 answers · asked by Anonymous

find (f*g)(x) and identify it's domain

f(x)= sqrt (x+8) ; g(x)=1-x^2

2007-10-04 18:51:19 · 3 answers · asked by rose 3

1.9h + 2< -79 (inequality)

2. 4y + 228 = 352 (equation)

3.12y = 132 (equation)

4.Given the formula K = LMN, what is the formula for M?

5.4m + 9 + 5m - 12 = 42. (equation)

2007-10-04 18:23:09 · 4 answers · asked by BravesFanForLife 3

solve:

3x + 2y = -11
-3x - 2y = 10

i tried to solve one equation then plug it in the other but its just not happening??

please show work. im so confused???

2007-10-04 18:09:03 · 6 answers · asked by Anonymous

i know this is like 7th grade knowledge but i forgot . tried looking online but they gave me 100 different things i didnt need to know.

if you can give me just one example so i can remember that would be great
thanks

2007-10-04 17:45:05 · 4 answers · asked by Spys On Pedestrians 4

(a) {{∅}} ∈ {∅, {∅}}? TRUE
{{∅}} ⊆ {∅, {∅}}? TRUE

(b) {{∅}} ∈ {∅, {{∅}}}? TRUE
{{∅}} ⊆ {∅, {{∅}}}? TRUE

(c) {{∅}} ∈ {∅, {∅, {∅}}}? FALSE
{{∅}} ⊆ {∅, {∅, {∅}}}? FALSE


Just wanted to check my answers with anyone.
Thanks for any help or corrections.

2007-10-04 17:42:31 · 3 answers · asked by Anonymous

Let
A = {3, 4}
B = {3, 4} ∪ ∅
C = {3, 4} ∪ {∅}
D = {x (x − 3)(x − 4) = 0}
E = {∅, 3, 4}
F = {4, 4, 3}
G = {4, ∅, ∅, 3}
Which of these sets are equal?


** My Answer**:
Set B is equal to set C.
And set C is equal to set E.
And therefore set B is also equal to set E.

Any mistakes in that? Additions?

2007-10-04 17:39:53 · 1 answers · asked by Anonymous

If you startt at the top of the pyramid and slide all the way down the middle of one of the four sides,how many feet will you move.
*I applied the pythagorean theormem to the pramid. Then I applied it to the square.Do I add both answers to find out how many feet will I move?

2007-10-04 17:39:07 · 2 answers · asked by glamour girl 1

y=-x^3+8x^2-21x+18

Steps as to how you get them would be nice...

2007-10-04 17:28:28 · 3 answers · asked by Anonymous

show works .

2007-10-04 17:23:16 · 14 answers · asked by ? 2

how would you find the inverse of :

y=2log(base3)(x-4)

thanks in advance.

2007-10-04 16:23:19 · 4 answers · asked by M.O.B 3

2007-10-04 15:31:45 · 2 answers · asked by nikki2ricki 2

for example 1x250=250 ------- 2x125=250

2007-10-04 15:29:33 · 6 answers · asked by Effie 2

Alright, you are tecnically NOT doing my homework if I understand it. kso:

"Nicolai said that 6 billion can represent the volume of a cube. How many units long is the cube, how do you know?"

I'm not stupid, but don't use your big big words, because no one understand them.
pls and thx!

2007-10-04 15:29:27 · 13 answers · asked by Lorncat 3

How many elements are in :
U(9)?
U(25)?
U(p^2), for a prime?
U(p^k), for a prime and k a positive integer?

as much explanation as possible would be great!!

2007-10-04 15:19:25 · 2 answers · asked by Anonymous

ok if the surface area of a cube 24 squared. FIND the volume of the cube plz give me the working out

2007-10-04 14:51:54 · 11 answers · asked by hamada 2