Science & Mathematics - 20 September 2006

is it 15 or 120?? ... math isn't my stronghold

2006-09-20 13:20:42 · 8 answers · asked by david p-p-preut 1 in Mathematics

im in grade 7 so dont gimme hard stuff give it to me nice and easy

2006-09-20 13:20:32 · 2 answers · asked by Omar 1 in Other - Science

suppose that the charges for a cell phone bill are $0.50 for the first minute and $0.25 for each additional minute. assume that a fraction of a minute is rounded up. how do i find a formula for a function "f" that computes the cost of a call that is "x" minutes long, where 0 < x <= 5? but writing it in a piecewise-constant fuction?

an explanation would be greatly appreciated and thanks for the help

2006-09-20 13:18:32 · 4 answers · asked by shih rips 6 in Mathematics

I have so many inventions and ideas I wish I could just sell them off one by one to the highest bidder. That is how I feel at this point in my life. I have run into so much bad luck with the knowledge that I can change the world but have no way of making my inventions come to life. I drag on day to day trying to complete my inventions the best I can. I actually have an invention already in process but its been over a year and I am still trying to pay off the patent. Honestly if there is anyone out there that wants to make some money off my inventions I will be more then happy to work with them. If you want to just fund me for the materials or actually help me put it together or even want to by all rights to my inventions it is your choice.

2006-09-20 13:15:54 · 3 answers · asked by SRK 1 in Engineering

x + 3y = 10

3x - 6y = 15

2006-09-20 13:14:00 · 3 answers · asked by honest abe 4 in Mathematics

y not gamma rays or visible light instead of x-rays? [This refers to powder diffractometer & Miller Indices]

2006-09-20 13:13:53 · 1 answers · asked by lean2x 1 in Engineering

2006-09-20 13:10:44 · 6 answers · asked by guitar_lady81 4 in Geography

In a variable expression, when a negative is changed into a positive because something is added to it, does the "-" sign turn into a "+" sign?

For example in this variable expression

-7a+3a-3c+5c

I know the first step is to add 7a and 3a which equals -4a

and then you add 5c to negative 3c which equals 2c

Is the final answer supposed to look like this: "-4a-2c"

or is it supposed to look like this because the 2c is now a positive?: "-4a+2c"

2006-09-20 13:09:42 · 7 answers · asked by RaphaelDeLaGhetto 2 in Mathematics

Anything about transpiration?

2006-09-20 13:09:33 · 1 answers · asked by Brent H 1 in Earth Sciences & Geology

2006-09-20 13:08:39 · 5 answers · asked by benabean87 2 in Physics

2006-09-20 13:06:47 · 17 answers · asked by Anonymous in Astronomy & Space

4v - 16 = 8v

2006-09-20 13:05:41 · 5 answers · asked by King Math 1 in Mathematics

2006-09-20 13:05:19 · 8 answers · asked by jose h 2 in Mathematics

2006-09-20 13:01:44 · 2 answers · asked by lost&confused 5 in Other - Science

2006-09-20 13:01:21 · 2 answers · asked by Anonymous in Other - Science

A high fountain of water is located at the center of a circular pool as in Figure P1.41. Not wishing to get his feet wet, a student walks around the pool and measures its circumference to be 25.0 m. Next, the student stands at the edge of the pool and uses a protractor to gauge the angle of elevation at the bottom of the fountain to be 55.0°. How high is the fountain?

2006-09-20 13:00:44 · 4 answers · asked by Anonymous in Physics

2006-09-20 13:00:28 · 11 answers · asked by pete_b4u 1 in Astronomy & Space

Also - what is the usual area of a tree?

2006-09-20 12:59:10 · 5 answers · asked by GolfWriterDAB7805 2 in Botany

2006-09-20 12:57:01 · 9 answers · asked by nelly 1 in Physics

AND why is meoisis called reduction division?

2006-09-20 12:56:56 · 2 answers · asked by FairestOfThemAll 2 in Biology

1/4 (z - 4) = -3/4 (z + 2)

I have been stuck on this darn problem for (10) minutes and I really need to move on to my History homework.

Thanks in advance for your help!

2006-09-20 12:56:14 · 8 answers · asked by King Math 1 in Mathematics

11.Suppose you fire a rifle bullet (1630 m/s) in a shooting gallery and hear the gong on the target ring 0.725 s later. Taking the speed of sound to be 330 m/s and assuming the bullet travels straight downrange at a constant speed, how far away is the target?
m



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12. You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.8 mi/h?
mi/h

2006-09-20 12:54:01 · 4 answers · asked by ckielblock18 1 in Physics

2006-09-20 12:53:51 · 9 answers · asked by lakersforlife 3 in Astronomy & Space

2006-09-20 12:53:51 · 5 answers · asked by Brent H 1 in Botany

2006-09-20 12:53:18 · 17 answers · asked by cer 2 in Mathematics

I really need to know why. Please give full answer.

2006-09-20 12:50:51 · 18 answers · asked by Anonymous in Mathematics

2006-09-20 12:49:38 · 10 answers · asked by yyy_ans 1 in Biology

What does catalyst mean?

2006-09-20 12:47:28 · 4 answers · asked by Haidee G 1 in Biology

2006-09-20 12:47:17 · 3 answers · asked by Jacky 1 in Biology

i need to know for a science project. if u know wat are some other examples also. the first person to answer is top answer.

2006-09-20 12:45:51 · 5 answers · asked by roocatty_67 1 in Chemistry