Science & Mathematics - 8 September 2007

7889 base 5 + 7889 base 7+ 7889 base 8 = ?

Yupp, its pretty tricky but it only took me like around 5 minutes. How about you?

2007-09-08 16:55:33 · 8 answers · asked by Linda Nguyen 1 in Mathematics

The intersection of the three perpendicular bisectors of a triangle is called the ___________ of the triangle.

a)Circumcenter

b)Incenter

c)Orthocenter

d)Centroid

2007-09-08 16:51:12 · 7 answers · asked by Anonymous in Mathematics

Group -6
Period -7

2007-09-08 16:49:34 · 2 answers · asked by To-the-Stars 4 in Chemistry

Given: Angle YXW is congruent to angle ZXW, determine which of the following describes segment XW in triangle XYZ.

a)Perpendicular Bisector

b)Median

c)Altitude

d)Angle Bisector

2007-09-08 16:49:03 · 2 answers · asked by Anonymous in Mathematics

Suppose this was the problem..

If a person weighs 165 lbs, how many grams does this person weight? The answer's 74,910 grams, but how do I write this properly, considering sig figs and all that? Rules and when to do what are appreciated.

2007-09-08 16:48:23 · 5 answers · asked by lirael1019 1 in Chemistry

Can anyone help me start it off? I'm pretty sure i know the facts i just dont really know how to write a reserch paper

2007-09-08 16:46:02 · 3 answers · asked by Baseball21 2 in Physics

Who concluded that Acceleration due to gravity was 9.8m/s/s?

Pleasse help!

2007-09-08 16:46:01 · 2 answers · asked by Daniel C 2 in Physics

I took elementary alegbra first it took me four times to pass it and now im in intermidaite alebgra I need some help Im close to graudating and im gonna let alot of people down I just dont get math any advice would be helpful.

2007-09-08 16:45:48 · 2 answers · asked by KING 6 in Mathematics

2007-09-08 16:42:50 · 5 answers · asked by Anonymous in Physics

Assuming 87.5 heartbeats/min, estimate the total number of times the heart of a human beats in an average lifetime of 59.4 yeasrs. Answer in units of heartbeats.

2007-09-08 16:40:31 · 2 answers · asked by Anonymous in Physics

2007-09-08 16:40:19 · 11 answers · asked by Chicago 4 in Mathematics

2007-09-08 16:39:20 · 7 answers · asked by To-the-Stars 4 in Chemistry

A diving bell has an air space of 3.0m^3 when on the deck of a boat. What is th evolume of the air space when the bell has been lowered to a depth of 50m? Take the mean density of sea water to be 1.025g / cm^3 and assume that the temperature is the same as on the surface.


First I took 1.025g/cm^3 and converted it to kg/m^3. Then I multiplied it by acceleration of gravity so that I could turn it into a pressure. After this I multiplied by 50m to get 50,225 N/m^2, which is 50,225 Pa (P2). Given that STP is 1 bar (10^5 Pa) I designated that P1. V1 is given as 3m^3 so I calculated V2 using P1*V1=P2*V2 but I got an answer that was higher than my original volume which can't be correct.

2007-09-08 16:39:13 · 1 answers · asked by ScienceNut 2 in Chemistry

How many uranium atoms are there in 8.7 g of pure uranium? The mass of one uranium atom is 4x10^-26 kg;

2007-09-08 16:37:36 · 4 answers · asked by Anonymous in Physics

If you release the air from the capsule, how many cubic inches of air will you have?

2007-09-08 16:36:12 · 2 answers · asked by r m 2 in Physics

x2 but the the 2 is small like this x³ but instead it a 2 .

2007-09-08 16:35:02 · 3 answers · asked by loving_you_4ever 2 in Mathematics

find the exact value of 4sin^3 60degrees+cos^4 30degrees sin^5 0degrees leave answer in fractional form. Do not use a calculator. problem 2 : decide if true or false a: cos138 degrees=cos-222degrees second part of problem 2 b: cos^2 68 degrees=1divided by csc^2 22degrees and for problem 2 a:,b: identify the name of these angles

2007-09-08 16:32:25 · 5 answers · asked by abbaofchess 1 in Mathematics

I feel sorry for the black widows. They haven't done much to us, and we're killing them in return. I feel the weight of guilt in my stomach. Is there a way to get rid of them without killing or poisoning them?

2007-09-08 16:31:15 · 4 answers · asked by Anonymous in Zoology

When rounding to preserve significant figures, why is it that when the digit removed is 5, the preceding number is increased by 1 if it is odd and remains unchanged if it is even? For example, what is the logic in rounding 17.71 to 17.8, but 17.79 to 17.7? Clearly, that is unreasonable!

2007-09-08 16:30:27 · 8 answers · asked by cartonboy 2 in Mathematics

Show your work,

2007-09-08 16:30:24 · 3 answers · asked by s h 1 in Mathematics

In general, how would you sketch a vector that was n times a given vector? How are the lengths and headings of these two vectors related?

2007-09-08 16:28:37 · 3 answers · asked by ? 1 in Mathematics

I know that you DO, what I'm asking for is a justification. We're always taught that when you have to divide fractions, you just multiply by the reciprocal, but I've never understood why this is so. Thanks for your help.

2007-09-08 16:27:50 · 3 answers · asked by Zowzooma, the Angry Deity 2 in Mathematics

A computer store sells 10 floppy diskettes for 15 dollars and 30 disks for 40 dollars. The dollars varies linarly with the disks. Predict the price for a box of 100 disks.

I got 157 dollars, and y = mx + b, I got 32 as my b, I think something is wrong here =(

Please help >_<

2007-09-08 16:27:06 · 5 answers · asked by Recoil 2 in Mathematics

Are they in double or triple bonds? Or do they just have 1 and 2 pi bonds respectively?

2007-09-08 16:26:14 · 3 answers · asked by Anonymous in Chemistry

Y=1/7x+b

Y=mx+b

2007-09-08 16:25:52 · 6 answers · asked by RedSparkle 1 in Mathematics

2007-09-08 16:23:58 · 9 answers · asked by Chicago 4 in Mathematics

And if you know....how did he discover this?

2007-09-08 16:19:26 · 2 answers · asked by justask23 5 in Physics

i really really need.. who can help me?...

2007-09-08 16:18:07 · 3 answers · asked by gwapong_daga1212 1 in Mathematics

So I had to find four least common multiples done out below:
a) LCM(8,12) = 24
b) LCM(20, 30) = 60
c) LCM(51, 68) = 204
d) LCM(23, 18) = 414

For each of the LCMs computed above, I have to compare the value of LCM(a, b) to the values of a, b, and gcd(a,b) and find a relationship between the two.

So I've basically calculated the gcds and retrieved the following:
a) gcd(8,12) = 4
b) gcd(20,30) = 10
c) gcd(51,68) = 17
d) gcd(23, 18) = 1

The only relationship I've found is that the difference between a and b is the gcd for them in cases a through c. I was wondering, is there another pattern I should be aware of here?

2007-09-08 16:17:43 · 4 answers · asked by Fonzieo 1 in Mathematics

I'm solving for both b and a
started with:
90+b+a=180
so:
b=90-a
so I substitute it in the original solution:
90+(90-a)+a=180
which goes to
(90-a)+a=90
that's where I get stuck

I can't remember how to keep going to solve for 'a' (it's been a couple years since my last math class)
you don't have to solve it out in the answer, but if you could just tell me what to do. I've been stuck on this for over an hour.
Thanks in advance

2007-09-08 16:16:31 · 7 answers · asked by dancerhelen2006 3 in Mathematics