Science & Mathematics - 16 July 2007

Let f:D-->R be continuous at c belonging to D and suppose that f(c)>0. Prove that there exists an $>0 and a neighborhood U of c such that f(x)>$ for all x belonging to U intersection D.

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2007-07-16 01:54:35 · 2 answers · asked by news4van 1 in Mathematics

2007-07-16 01:51:58 · 7 answers · asked by musicalgoddess 1 in Other - Science

Let f: D-->R and define |f|:D-->R by |f|(x)=|f(x)|. Suppose that f is continuous at c belonging to D. Prove that |f| is continuous at c. If |f| is continuous at c, does it follow that f is continuous at c? Justify your answer.

2007-07-16 01:51:57 · 4 answers · asked by news4van 1 in Mathematics

What is the complete factors of 297?

2007-07-16 01:48:10 · 2 answers · asked by rojo_salas 2 in Mathematics

pls help me..

2007-07-16 01:46:21 · 2 answers · asked by Anonymous in Chemistry

2007-07-16 01:45:12 · 3 answers · asked by Nish 2 in Chemistry

IT is light blue in color has in order a red stripe then there is a thicker black strip followed by a thinner black stripe and finally a brown stripe? Is this a resistor I need one for a welder and this is burned out in a circuit board. Where could I get one? I see radio shack has alot of them but no light blue ones? Thanks

2007-07-16 01:41:47 · 7 answers · asked by steady 1 in Engineering

I wanted to know the orbital structure of potassium superoxide.
How is this compound possible?
Do any compounds have a negative or positive charge?

2007-07-16 01:35:44 · 2 answers · asked by in s 1 in Chemistry

The formula

1/R=(1/r1) + (1/r2)

determines the combined resistance R when resistors r1 and r2 are connected in parallel. Use total differentiation to determine the effect of a decreasing r1 to the combined resistance R.(assume that r2 is fixed.)

2007-07-16 01:31:15 · 2 answers · asked by physics maniac 2 in Mathematics

2007-07-16 01:15:39 · 9 answers · asked by zonaith 2 in Astronomy & Space

2007-07-16 01:07:11 · 12 answers · asked by Randy B 1 in Mathematics

What scientific experiment way for the ultimate acceptance of yukawa's theory?

Thanks to all!

2007-07-16 01:05:28 · 1 answers · asked by chelzy y 1 in Physics

Prove that if gcd ( a ,b ) divides c , the eqaution has infinitly many solutions .Can you show this step by step . Thanks !

2007-07-16 01:03:13 · 2 answers · asked by Arithmetica 1 in Mathematics

2007-07-16 00:57:31 · 10 answers · asked by Shuniko 2 in Earth Sciences & Geology

2007-07-16 00:57:25 · 14 answers · asked by Amy H 1 in Earth Sciences & Geology

At what time, between 3:00 & 4:00 will the sum of the angles of the two hands add up to 270°? The angle of each hand is measured from the 12:00 position, clockwise, to their current time position. Give the exact time. Hour:minute:second (seconds provided with one digit after the decimal point) Provide your solution please.

2007-07-16 00:33:21 · 7 answers · asked by Alam Ko Iyan 7 in Mathematics

a Filipino

2007-07-16 00:32:10 · 1 answers · asked by irina 1 in Biology

when steamer is running in sea at a speed,it is cutting wind.This wind velocity can be used to operate a windmill if installed?

2007-07-16 00:27:35 · 6 answers · asked by hari d 1 in Engineering

can any one asnwer plz

2007-07-16 00:26:53 · 8 answers · asked by suryya j 1 in Mathematics

If a fly is placed inside a vehicle and the vehicle starts moving, the fly remains stable as if its also flying at the same phase of the car, but if it is placed outside the car, it flies steadily.

2007-07-16 00:23:26 · 2 answers · asked by monicakryzelle_fortes 4 in Biology