Science & Mathematics - 30 October 2007

Here is the problem:

Find three consecutive even numbers whose sum is 468.

I know it probably seems simple, but I don't really understand.
Help?

Please & Thank you all!

2007-10-30 13:38:22 · 4 answers · asked by tonetti@sbcglobal.net 2 in Mathematics

is this right?

2x-y=3
-2x -2x
-y= -2x+3
-1(-y=-2y+3)
y= 2x - 3

the perpendicular line that would interesect that line at that point would be:
y = -1/2x +6

intersection (4.25, 5.5)
distance = √ 5.3125

is this right?

2007-10-30 13:38:03 · 4 answers · asked by : ) 2 in Mathematics

Find all the values of n that solve the following equation
φ(n) = n/6

by using the formula
φ(n) = n(1 - (1/p_1))(1-(1/p_2))...(1-(1/p_r))

2007-10-30 13:37:46 · 1 answers · asked by 3545 2 in Mathematics

this problem says that i have a concentration of 9.00x10^18 molecules/cm^3 of NO. this isn't the correct unit for molarity right? how do i convert it to the correct moles/liters unit?

for the top, do i use avogadro's number? and for the bottom, convert to m^3? but i don't see how i can do that with the number.

thanks for your help!

2007-10-30 13:35:47 · 2 answers · asked by molly connolly 2 in Chemistry

ok so we had to do factors for all numbers from 1-100 and ive done all but 17 and im really tired of math so could someone do these for me?:
53
59
60
61
65
66
67
68
71
73
74
76
79
83
89
91
93
97


or tell me a link to a site that has them. thanks

2007-10-30 13:35:41 · 2 answers · asked by Morgan 3 in Mathematics

1. √4x+1+3=0

2. √2y+7+4=y

2007-10-30 13:35:24 · 3 answers · asked by tricey7578 2 in Mathematics

2007-10-30 13:34:01 · 1 answers · asked by carolyn 1 in Chemistry

Take the derivative of this, and show all steps:

f(x) = x sqrt(4 - x^2)

Thanks :)

2007-10-30 13:34:01 · 5 answers · asked by Anonymous in Mathematics

Urea (H2NCONH2) is used extensively as a nitrogen source in fertilizers.

2NH3 (g) + CO2 (g) --> H2NCONH2 (s) + H2O (g)

Ammonia gas at 223 C and 90. atm flows into a reactor at a rate of 500 L/min. Carbon dioxide at 223 C and 45 atm flows into the reactor at a rate of 600L/min. What mass of urea is produced per minute by this reaction assuming 100% yield?

2007-10-30 13:30:37 · 4 answers · asked by Anonymous in Chemistry

2007-10-30 13:29:31 · 2 answers · asked by harry b 1 in Physics

with a hydroxide concentration of 3.7 x 10 ^-8(ten to the negative eighth). I got a pH of 7.4, but my friend said it was 6.6. Which one of us is right? And if it is 6.6, how did you get that?
Thanks

2007-10-30 13:29:12 · 1 answers · asked by lil bill 7 2 in Chemistry

s e e
+ y o u
= s o o n

2007-10-30 13:29:08 · 7 answers · asked by raj 1 in Mathematics

a mole is 6.02X10^23 by the way. here's the problem
there are 15,000 miles of road. for every 8ft. you need to put in a pole. How many moles of poles need to be ordered?

2007-10-30 13:28:53 · 2 answers · asked by Carmen 3 in Chemistry

i cant think of a question that has to do with spray paint
i like paint so thats why i want a project that has sumtin to do with paint
im in 7th grade
so i need something thats average difficulty
not too easy or simple and not too difficult

can u think of a question that has to do with paint??


format; Does the __________________ affect the ______________??

2007-10-30 13:27:42 · 3 answers · asked by rmk_12795 2 in Other - Science

We live on a small island in the Bahamas so obviously we've been following the storm closely and I am puzzled why after such a long time of the storm moving toward Cuba in a WNW direction that the anticipated path still shows the path as NNE? Are there some forces at work here that would push this in that direction at this point? I guess I'm saying how do they know where it is going?

2007-10-30 13:27:03 · 3 answers · asked by landlubber39 1 in Weather

How do I calculate the pH of a solution containing .80 M lactic acid (HC3H5O3) and .20 M sodium lactate (NaC3H5O3) where lactic acid has a Ka value of 1.4 x 10^-4(ten to the negative four)?
Thank you!

2007-10-30 13:26:57 · 1 answers · asked by lil bill 7 2 in Chemistry

2007-10-30 13:26:50 · 1 answers · asked by Kristijan R 1 in Physics

2007-10-30 13:25:55 · 4 answers · asked by TerryVG 1 in Mathematics

3.27 (27repeats)

2007-10-30 13:23:48 · 3 answers · asked by connnanza 2 in Mathematics

I NEED THIS ANSWERED IN FULL DETAIL, PLEASE HELP ME!
A movie theater sold a fourth as many adult tickets as childrens tickets. The total made from ticker sales was 2178.75$. If adult tickets cost 7.25$ and chilren tickets 4.75$. Answer the following questions:
a)How many adult tickets were sold
b) How many childrens tickers were sold?

2007-10-30 13:22:05 · 7 answers · asked by Anonymous in Mathematics

I NEE THIS ANSWERED IN FULL DETAIL, PLEASE HELP ME!
A movie theater sold a fourth as many adult tickets as childrens tickets. The total made from ticker sales was 2178.75$. If adult tickets cost 7.25$ and chilren tickets 4.75$. Answer the following questions:
a)How many adult tickets were sold
b) How many childrens tickers were sold?

2007-10-30 13:20:27 · 4 answers · asked by Anonymous in Mathematics

Is there a value of c for f(x)=x^3+2x^2+cx for which there is exactly ONE horizontal tangent?

2007-10-30 13:18:36 · 1 answers · asked by Anonymous in Mathematics

HI

2007-10-30 13:17:09 · 5 answers · asked by Anonymous in Geography

which means the same as: 4.76 * 10>5

the 5 is suppose 2 be an exponen

so its actually .76 times 10 to the 5th power


47,600 4760000 47600000 476000





thnks!

2007-10-30 13:15:56 · 5 answers · asked by Anonymous in Mathematics

2007-10-30 13:15:52 · 1 answers · asked by Irene K 1 in Earth Sciences & Geology

2007-10-30 13:11:43 · 3 answers · asked by Anonymous in Mathematics

need some help

>the middle digit of a three digit number is 3 more that twice the extreme digits which are numerically equal. if the number is divided by 3 the number formed is 11 more than 8 times the sum of the digits. Find the number

2007-10-30 13:11:16 · 5 answers · asked by Anonymous in Mathematics

2007-10-30 13:11:08 · 3 answers · asked by ♥FABULOUS♥ 2 in Medicine

i want to be able to calculate a good estimate, like 3 digits behind comma. without tools., just private memory calculations.

2007-10-30 13:08:22 · 3 answers · asked by me c 2 in Mathematics

2007-10-30 13:07:10 · 6 answers · asked by theclickREDGE 1 in Mathematics