Mathematics - 16 August 2007

I would really appreciate some assistance on this problem. I can't seem to get the correct answer. Thank you so much!

You can obtain a rough estimate of the size o f a molecule with the following simple experiment: Let a droplet of oil spread out on a fairly large but smooth water surface. The resulting "oil slick" that forms on the surface of the water will be approximately one molecule thick.

Given an oil droplet with a mass of 9.03 x 10^-7 kg and a density of 911 kg/m^3 that spreads out to form a circle with a radius of 43.8 cm on the water surface, what is the approximate diameter of an oil molecule? Answer in units of m.

2007-08-16 10:40:50 · 5 answers · asked by sg88 1

2007-08-16 10:34:36 · 8 answers · asked by aseel a 1

y = x^2 - 2x - 15


For the above quadratic equation find:

a.The y-intercept.

b.The x-intercepts if possible.

c.The vertex.

d. The line of symmetry.

2007-08-16 10:34:33 · 6 answers · asked by Anonymous

1. How many solutions are there to the quadratic equation
2x^2+7x+12 = 0?

a. 2
b. 1
c. 0
d. 3

2. When the discriminant equals zero, or b^2- 4ac = 0, expect ___ root(s).

3. Find the discriminant for the following quadratic equation and use it to determine the number of roots or real solutions it has.

x^2 + 3x + 15 = 0

2007-08-16 10:32:27 · 2 answers · asked by Anonymous

2007-08-16 10:28:56 · 7 answers · asked by Anonymous

In math

2007-08-16 10:27:44 · 4 answers · asked by Anonymous

2007-08-16 10:24:43 · 6 answers · asked by Anonymous

Ok so we just learned conversion factors today and it looked easy and it is easy but I dont know what to do on the worksheet tonight
heres a sample problem

256 gal./min X ? = ? gal. / hour

2007-08-16 10:23:07 · 7 answers · asked by Anonymous

First, I've been asked to graph multiple functions, 2 of which I cannot figure out how to graph or enter into a calculator for a general idea:

f(x)= log base 2 (x) ; f(x)= √(a^2)-(x^2) )

So if somebody could explain how to do this, or find a reference I can check out that would be awesome.

Secondly, Is there a relationship between symmetry in a function's graph and the function being even or odd?

Last, if a set of directions say to "Draw a reflection" of..sin(x) (for example), is that the same as regular graphing?

Thanks

2007-08-16 10:16:34 · 1 answers · asked by I Know Nothing 6

Okay here is the problem anyone that can help explain it with the correct answer will get 10 points...Thanks

Here is the problem: Find the size of the angles in decimal degrees for the clock hand moving for the given time period for a twelve-hour clock. Answer should be exact.

a. hour hand in 4 hours
b. minute hand in 15 minutes
c. second hand in 55 seconds
d. hour hand in 45 mintues
e. second hand in 2 hours

2007-08-16 10:11:52 · 3 answers · asked by L J 3

find the radius of a circle given by the equation x^2+y^2-2ax-2ay=0
I get a*sqrt2
but my book says sqrt(2*a)
I think it is wrong. what is your verdict?

2007-08-16 10:10:52 · 4 answers · asked by eazylee369 4

2007-08-16 10:08:28 · 7 answers · asked by ♥xXEscape the Fate Fanatic!Xx♥ 3

The degree measures of two consecutive angles of a rhombus are represented by 5x + 10 and 3x + 50. Find x

the point is i don't understand the word consecutive means. Does it mean the same or not the same.

2007-08-16 10:01:40 · 5 answers · asked by Anonymous

What is the length of spacial diagonal of the brick?

2007-08-16 10:00:12 · 5 answers · asked by Alexander 6

are opposite angles congruent?
parallelogram
rectangle
square
rhombus
square
trapezoid
thanks!

2007-08-16 09:56:55 · 6 answers · asked by Anonymous

Hi. I need some help with 3 geometry problems. Please explain how to do these?

1) The area of a circle is 16 pi. What is it's circumference?

2) What is the area of a circle with diameter 12?

3) What is the area of an equilateral triangle with perimeter 12?

Any help is greatly appreciated. Thank you very much!

2007-08-16 09:52:49 · 4 answers · asked by Randy M 1

2007-08-16 09:46:39 · 5 answers · asked by Lillian M 1

1/2p - 3p = 54 + 4p

^^ directions and answe rplz ^^

first one to gimme will get best answer

2007-08-16 09:45:17 · 10 answers · asked by Kwan L 2

2007-08-16 09:43:36 · 6 answers · asked by mupinupe 1

2007-08-16 09:40:41 · 12 answers · asked by Stephanie Ke 1

2007-08-16 09:37:26 · 5 answers · asked by Robert L 1

i bought a dress and they gave 20 percent off of that. can anyone help me apeaaach

2007-08-16 09:35:05 · 7 answers · asked by Princess_Three 1

2007-08-16 09:28:56 · 4 answers · asked by Lillian M 1

(1)Smith works twice as fast as Legatos and three times as fast as Paruolo. If paruolo can complete a job in 12 hours, what part of the job can Legatos do in 6 hours?

I don't get how to setup the equation


(2) If 3 secretaries can type six manuscripts in 12 days, how many days will it take two secretaries to type three such manuscripts?

someone please explain how to do this one

2007-08-16 09:28:18 · 2 answers · asked by Zebra S 1

2007-08-16 09:17:24 · 5 answers · asked by Lillian M 1

are opposite sides congruent and parallel?
a. parallelogram
b. rectangle
c. rhombus
d. square
e. trapezoid

thanks

2007-08-16 09:11:45 · 5 answers · asked by blahhhhhh 2

2007-08-16 09:09:54 · 4 answers · asked by pepperutka 1

The theme here is statistics. And please give some examples.

2007-08-16 09:00:08 · 2 answers · asked by KC 1

1)The formula used to find the area of a circle is?

2)1 ton = ________ pounds?

3)Find the area of a circle with a radius of 5

A = ?

*use 3.14 for

4)IS The Pythagorean Theorem only applicable for right triangles (triangles with one angle measuring 90 degrees).

5)5 kilometers is a little more than 3 miles?

2007-08-16 08:52:06 · 6 answers · asked by Patrice 1

2007-08-16 08:40:49 · 7 answers · asked by Money Makes Me C(u)m 1