Science & Mathematics - 31 January 2007

Colored copies cost 10 cents per copy and white copies cost 5 cents per copy. Sandy made 400 copies, some of which were colored and the rest white. Her total bill was $22.50. How many colored copies and how many white copies did she make.

Please tell me how you solved it and the equation.

2007-01-31 17:24:35 · 5 answers · asked by surina g 1 in Mathematics

Once you get so far north in like northern alaska or above there into canada, why will trees not grow?

2007-01-31 17:23:02 · 2 answers · asked by Lori 2 in Earth Sciences & Geology

what kind geological exploration is being done in the brooks range and what exactly are they trying to find?

2007-01-31 17:21:55 · 1 answers · asked by Lori 2 in Earth Sciences & Geology

x2/2 is for [x], how about 1/x?

2007-01-31 17:21:15 · 2 answers · asked by moonprince_04 1 in Mathematics

2007-01-31 17:16:51 · 3 answers · asked by Anonymous in Other - Science

I just can't find the answer, can anyone help me as soon as possible?

2007-01-31 17:15:06 · 6 answers · asked by Karla__Nouel 1 in Zoology

Is it possible incorporate a magnet into a ciircuit and, without any moving parts, use that magnet to generate electricity ?

2007-01-31 17:14:47 · 3 answers · asked by yoffi_98 1 in Engineering

why our mind taking time to think some fast and some slow?

2007-01-31 17:12:41 · 6 answers · asked by jeet 1 in Astronomy & Space

a. 2bh
b. 1/2 bh
c. s^2
d. s^3

2007-01-31 17:10:25 · 4 answers · asked by last3member2002 1 in Mathematics

ok here are some problems that I'm completely stuck on..can someone help ...if you know atleast one that would be great I just need help on these.. Thanks

x= the variable not multiplication for those who asked on my other question.

Here I have to use properties of logs to condense the logs to a single term:

1/2 log base 10 x + 3 log base 10 (x+1)


Here I have to expand the following expressions using logs:

√3x-5
-------- (All of that goes under the square root sign)
7


4x √10-3x

(Only the 10-3x are under the square root sign)


Here I have to solve the exponential equation using log properties:

2 log base 5 3x = 4



log base 3 x + log base 3 {(x^2) - 8 } = log base 3 8x

2007-01-31 17:06:04 · 2 answers · asked by Ivanna 2 in Mathematics

I know the answer but not how to write it in ratio or proportion please HELP

2007-01-31 17:04:55 · 14 answers · asked by wornne g 1 in Mathematics

2007-01-31 17:04:20 · 7 answers · asked by ? 6 in Geography

Sometimes during startup cycle of the burner sequance controller Trips only after a flame is formed at that time doubt goes on flame sensor, but I dont know how to test this flame sensor, whether it is Good or not.

2007-01-31 17:01:35 · 1 answers · asked by Anonymous in Engineering

NEED HELP..use ratio of proportion

2007-01-31 17:01:33 · 11 answers · asked by wornne g 1 in Mathematics

2007-01-31 16:59:42 · 2 answers · asked by Anonymous in Mathematics

I need to purge a tank of air and need to know if the nitrogen will sink to the bottom of any remaining air.

2007-01-31 16:59:01 · 7 answers · asked by grantm880 1 in Chemistry

help this is important, I am trying to help my son. I finished school 40 years ago.

2007-01-31 16:58:45 · 7 answers · asked by wornne g 1 in Mathematics

Why does it generally decrease as you go from left to right across a row on the periodic table??

2007-01-31 16:57:45 · 3 answers · asked by Tracey Lee ♥ 2 in Chemistry

2007-01-31 16:57:41 · 2 answers · asked by moonprince_04 1 in Mathematics

2007-01-31 16:57:14 · 4 answers · asked by scyther g 1 in Biology

according to instruction on a bag of fertilizer 5lb cover 100 sq ft. how many sq ft 25 lbs will cover? use proportion or ratiov

2007-01-31 16:56:11 · 5 answers · asked by wornne g 1 in Mathematics

2007-01-31 16:51:39 · 3 answers · asked by chilli bean 1 in Physics

a)The Sun’s core would start to cool down and the rate of fusion would decrease.
b)The Sun’s core would reach a new equilibrium at a lower temperature.
c)The Sun’s core would reach a new equilibrium at a higher temperature.
d)The Sun’s core would start to heat up and the rate of fusion would increase even more.

2007-01-31 16:51:31 · 3 answers · asked by matt g 1 in Astronomy & Space

is it mutants, or any thing else better than humans what does science suggest.

2007-01-31 16:47:40 · 14 answers · asked by xxsanxx 5 in Biology

A norman window has the shape of a rectangle surmounted by a semicircle. if the perimeter of the window is 30ft, express the area A of the window as a function of the width x of the window.

2007-01-31 16:46:21 · 5 answers · asked by Anonymous in Mathematics

2007-01-31 16:45:05 · 7 answers · asked by Janelle M 1 in Physics

2007-01-31 16:45:04 · 1 answers · asked by Kerrick M 1 in Biology

2007-01-31 16:44:38 · 5 answers · asked by rlnoob 1 in Weather

So please only answer this if you actually know the answer. I was just wondering from what kind of rock are most diamonds produced?

2007-01-31 16:43:54 · 4 answers · asked by Lori 2 in Earth Sciences & Geology

How I can know the position of my latitude and longitude without GPS system? Is there any way to know all this manually?

2007-01-31 16:43:30 · 5 answers · asked by Anonymous 2 in Geography