Mathematics - 22 September 2007

2007-09-22 14:12:36 · 9 answers · asked by need help now pleaze 1

Can you figure out this tricky math problem? (10 points to the first right answer! You must show logic behind answer.)

Lockers in a row are numbered 1, 2, 3, ..., 1000. At first all the lockers are closed. A person walks by, and opens every other locker, starting with locker #2. Thus lockers 2, 4, 6, ..., 998, 1000 are open. Another person walks by and changes the "state" (i.e.,closes a locker if it is open, opens a locker if it is closed) of every third locker starting with #3: 3, 6, 9... Then another person changes the state of every 4th locker. The process conintues until no more lockers can be altered. Which lockers will be closed?

2007-09-22 14:11:38 · 2 answers · asked by Eric and Alex K. 1

The sum of 25 consecutive odd number is 1275.
Find the largest and smaller of these numbers.

2007-09-22 14:10:33 · 3 answers · asked by Anonymous

i^65

2007-09-22 13:49:20 · 2 answers · asked by Anonymous

lim
x->2.5

25 - 4x^2 / 2x + 5

2007-09-22 13:45:33 · 4 answers · asked by jake p 2

n is an integer. The reste of n divided by 8 is 5.
whats is the rest of the division of n+1 divided by 8?
what is n?
whats is the reste of the divison of n+4 divided by 8

2007-09-22 13:38:35 · 4 answers · asked by Chantal S 1

2007-09-22 13:27:26 · 5 answers · asked by Anonymous

Given the parabola x² = (1/2)y, for what values of m does the line y=m(x+1)
(a) have 2 points of intersection?
(b) have one point of intersection?
(c) have no points of intersection?

I think once I understand the first one I may be able to understand the others, but I have no idea how to do the first one. Help please!!

2007-09-22 13:26:48 · 1 answers · asked by mj_ 2

Abstract algebra

2007-09-22 13:22:15 · 3 answers · asked by Anonymous

problem:
find absolute madimum and minimum values, if they exist, over the indicated interval
the equation is
f(x) 3/4x^4 + 1/3x^3 -3x; [-1,3]

I got no max, and min of .90033

is that right?

2007-09-22 13:21:03 · 4 answers · asked by jake p 2

if you do someone's elses math homework will it get you suspended or expelled?

2007-09-22 13:15:04 · 5 answers · asked by Tiffany T 1

2007-09-22 13:06:07 · 3 answers · asked by Anonymous

pls give me da detail steps

2007-09-22 13:05:09 · 2 answers · asked by aham brahmasmi 2

Solve this and show work

dy/dx = (2x^2+1)/(xe^y) , x>0

2007-09-22 13:01:40 · 3 answers · asked by Lois C 1

2007-09-22 12:45:17 · 7 answers · asked by jr 2

Here is problem in original form.

Find the point(s) where the tangent line to f(x)=((x^2)-1)(x+7) is perpendicular to the line y=(1/2)x+7

Here is what I have done:

y=(1/2)x+7 so m=1/2 and perpendicular slope is -2

I do not know where to go on because I am very, very tired...I have slept only 7 hours in the past 48 hours, so please help.

2007-09-22 12:34:23 · 3 answers · asked by pyrojelli 2

15x= 350 + x^2

2007-09-22 12:28:44 · 7 answers · asked by Anonymous

2007-09-22 12:22:59 · 4 answers · asked by baseballman1243 1

Let G be a group with the following property: whenever a, b, and c belong to G and ab = ca, then b = c. How can you prove that G is Abelian??? (hint: cross cancellation implies commutatively).

2007-09-22 12:22:50 · 5 answers · asked by Anonymous

Please can somebody help me with this, thankyou very much =]

2007-09-22 12:19:01 · 3 answers · asked by Anonymous

3+√x+2=1

a.62
b.64
c{}
is this answer c.

√x+5=9

a.2
b.4
c.16
4?

do this have roots.?
2√5x-4 -3=-11

2007-09-22 12:05:18 · 1 answers · asked by yoshi_gurl08 1

I need help solving this inequality:

2x-5/4 < 3x -4

Thanks for the help!!!!

2007-09-22 12:02:41 · 3 answers · asked by Mia16 3

http://i1.tinypic.com/4xopcnd.jpg

i got:
x2 - 6x = x + 8
x2 = 7x + 8
x2 + 7x + 8 = 0

then i got confused
(by x2 i mean x squared)

2007-09-22 11:59:16 · 6 answers · asked by . 3

2007-09-22 11:35:07 · 1 answers · asked by rene r 1

√25
------ the whole problem is under the square root
128




2√20+ 8√45 - √80

(how would i combine and simplify this.)

and
(3√y)^2

2007-09-22 11:17:31 · 1 answers · asked by yoshi_gurl08 1

2007-09-22 11:08:11 · 4 answers · asked by Anonymous

A certain ball has the property that each time it falls from a height 'h' onto a hard, level surface, it rebounds to a height 'rh', where 0 < r < 1. Suppose that the ball is dropped from an initial height of 'H' meters.

a) Assuming that the ball continues to bounce indefinitely, find the total distance that it travels. (Use the fact that the ball falls 1/2gt^2 meters in 't' seconds)

b) calculate the total time that the ball travels.

c) suppose that each time the ball strikes the surface with velocity 'v' it rebounds with velocity '-kv', where 0 < k < 1. How long will it take for the ball to come to rest?

explanation/steps plz..thanks :)

2007-09-22 11:00:38 · 1 answers · asked by Anonymous

Does T in the equations means time?

2007-09-22 10:50:24 · 7 answers · asked by Anonymous

2007-09-22 10:50:20 · 5 answers · asked by Anonymous

solve by elimination please

2007-09-22 10:44:13 · 7 answers · asked by Anonymous