Science & Mathematics - 13 July 2007

My birthday is on the thirteenth of August 1987. How often does it fall on Friday the thirteenth and when will the next occurence be?

2007-07-13 06:33:52 · 12 answers · asked by Anonymous in Mathematics

2007-07-13 06:33:02 · 4 answers · asked by Lefty 2 in Biology

sqrt(u+3)=sqrt(u+3)

2007-07-13 06:31:48 · 6 answers · asked by the math 2 in Mathematics

Complete the following statement. x2 + 13x + 42 = (x + 6)( )

2007-07-13 06:31:28 · 5 answers · asked by Somebody 2 in Mathematics

what use is the meteorlogical office. They spend millions on sattelites and other equipment and very rarely get the forcast right.Apparantly during the war they rang Truro then Bristol then Oxford. They found out what the weather and wind direction was and knew within a few hours what the weather was going to be on the East coast. Weather forcasting today
is no more accurate than then.Why do we spend all this money?

2007-07-13 06:29:50 · 3 answers · asked by mickymo1 3 in Weather

The product of two consecutive positive even integers is 288. Set up an equation and solve to find the integers.

2007-07-13 06:21:11 · 9 answers · asked by Somebody 2 in Mathematics

2007-07-13 06:18:19 · 6 answers · asked by khattimithi19 1 in Mathematics

to read article
go to http://www.biochemj.org/bj/391/0285/bj3910285.htm#REF12

2007-07-13 06:16:04 · 2 answers · asked by galas 1 in Chemistry

2007-07-13 06:14:47 · 5 answers · asked by justwondering 2 in Medicine

I think Mars just a hotter non-oxygen verson of Earth because it does rain up there and they was finding some fossils of some type of bug up there. Do you think if it wasn't so hot and if it had more oxygen up there we can go there, build stuff, and live there?? And if we couldn't, why not what else is wrong with it??

P.S.: What type of bug fossil did they find like what type of bug(s) was it??

2007-07-13 06:09:33 · 13 answers · asked by Animal-luva4242 3 in Astronomy & Space

We have to wear space suits when we go to Mars, why isn't everything else on Mars floating around?

2007-07-13 06:07:41 · 21 answers · asked by Anonymous in Astronomy & Space

Find the slope and the y-intercept.
y = 3x


Find the slope and the y-intercept.
y = 5x + 8



Find the slope.
–9x + 8y = 22


and one more....

Find the slope and y-intercept.
–8x – 9y = 45

Thank you for any help

2007-07-13 06:07:28 · 8 answers · asked by sherri c 1 in Mathematics

I heard that Pluto wasn't a planet no more and they found ton others. What are their names??

2007-07-13 06:05:32 · 5 answers · asked by Animal-luva4242 3 in Astronomy & Space

Refer to the periodic table for atomic weights.
Please help me with this question on showing me how to work it out and find it. Please and thank you for anyone who decides to help.

2007-07-13 06:04:30 · 2 answers · asked by Kristina H 1 in Chemistry

Why is Mars the only planet?? Why can't we see the other planets from Earth??

2007-07-13 06:03:49 · 42 answers · asked by Animal-luva4242 3 in Astronomy & Space

It is asking to calculate the molar concentration of the solution.
Whoever does this will please do it step by step becasue i have the correct anwer I just don't know how to work it out.
Please, Please Help!!!

2007-07-13 06:02:18 · 4 answers · asked by Kristina H 1 in Chemistry

Does anyone know who invented digital electronics or the history of it? or who was the first in applying discrete value codes in electronics?

2007-07-13 06:00:55 · 6 answers · asked by Ludovico 2 in Engineering

i hv got this space settlement compttion...th place shud hv al th conditions present on earth...so lyk wat shape shud i choose? rmmber tht thre shudnt be a major diffrnce in gravity levels as the people livin inside will start feelin dizzy,sick n may evn fall in2 coma! PLSSS HELP!!!

2007-07-13 05:56:34 · 9 answers · asked by karan saharya 2 in Astronomy & Space

sum of (1 / pi)^n? sum of 1/n? sum of (-1)^n / square root of n? from when n goes from 1 to infinity

2007-07-13 05:56:02 · 4 answers · asked by Anonymous in Mathematics

Any date?

2007-07-13 05:52:30 · 9 answers · asked by Anonymous in Astronomy & Space

A 1.5 m long glass tube, closed at one end, is weighted and lowered to the bottom of a fresh-water lake. When the tube is recovered, an indicator mark shows that water rose to within 0.38 m of the closed end. Determine the depth of the lake. Assume constant temperature.

2007-07-13 05:49:29 · 3 answers · asked by makk 3 in Physics

2007-07-13 05:43:06 · 7 answers · asked by Anonymous in Astronomy & Space

2007-07-13 05:41:43 · 8 answers · asked by HELP!!!! 1 in Geography

express periodic impulse delta T = sigma of (delta (t-nT) for n from - to + infinity in terms of exponential Fourier series Cn using exponential Fourier series.

2007-07-13 05:41:18 · 1 answers · asked by 037 G 6 in Physics

express periodic impulse delta T = sigma of (delta (t-nT) for n from - to + infinity in terms of exponential Fourier series Cn using exponential Fourier series.

2007-07-13 05:40:32 · 1 answers · asked by 037 G 6 in Engineering

2007-07-13 05:37:25 · 7 answers · asked by nitu d 1 in Astronomy & Space

2007-07-13 05:34:57 · 7 answers · asked by Anonymous in Paranormal Phenomena

Ive always wondered because these two stimulants are very similiar. Any chemists out there that might know? They are also both addictive.

2007-07-13 05:33:01 · 6 answers · asked by joeschmo 3 in Chemistry

i was reading a book and it said if theres a thunderstorm when you here thunder start counting 1..2...3....... and when you here it again stop countng and whatever number you land on thats how many miles away the thunderstorm is is that true?

2007-07-13 05:29:17 · 20 answers · asked by vanilla 2 in Weather

2007-07-13 05:26:31 · 5 answers · asked by Abbe S 1 in Biology