I have come across some people that if you tell them any date, they can do some calculation in their mind and tell you correctly what day of the week it was or will be.

For example, if you ask what day it was on January 30, 2002. They can tell you it was Wednesday. How do they do that? If any of you know, can you please tell me.

Much thanks in advance!

2007-01-30 01:50:35 · 3 answers · asked by thecharmedfive 2 in Mathematics

1 ⤊

how many subgroups?

Let p be primes, how many subgroups of the order p does Sp have? what does np congruence 1 mod p say about (p-1)! and mod p?

ps: Sp is S sub p, and np is n sub p.

2007-01-30 01:50:03 · 1 answers · asked by kula o 2 in Mathematics

5 ⤊

0 ⤊

2 ⤊

3 ⤊

find (f ·g)(x) for f(x)=3x^2 and g(x)=5-x?

a. 3x^2-x+5
b. 75-30x+3x^2
c. 3x^2-15x^2
d. 15x^2-3x^3

2007-01-30 01:41:59 · 5 answers · asked by lana l 1 in Mathematics

0 ⤊

Why is there a count down till zero before launching a satellite or a rocket?

you would have noticed that before launching a satellite there is count down till zero. Can you help me find its answer

thank you

2007-01-30 01:38:37 · 6 answers · asked by Anonymous in Astronomy & Space

1 ⤊

how fast does a space shuttle travel when in orbit.?

can they circle the earth really fast!

2007-01-30 01:38:35 · 7 answers · asked by Anonymous in Astronomy & Space

1 ⤊

what are the differences our goverment and romans government?

2007-01-30 01:38:30 · 2 answers · asked by Anonymous in Astronomy & Space

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Science & Mathematics - 30 January 2007

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how many subgroups?

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find (f ·g)(x) for f(x)=3x^2 and g(x)=5-x?

Why is there a count down till zero before launching a satellite or a rocket?

how fast does a space shuttle travel when in orbit.?

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