Science & Mathematics - 28 August 2007

Can you show the steps? thanks a lot
Alix Witvoet

2007-08-28 06:10:58 · 3 answers · asked by Fake Account 1 in Mathematics

given a graph (that I am not sure how to put on here) find the expression f(x)=Ca^x

two points (0,2), (2,2/9)

I tried to solve it by
pluging in 2=Ca^x
I know that x=0 at Y=2
2=C1 (a^0 is 1 correct?)
2=C

plug in 2 for a in 2/9=2a^2
solve for a and get 2/3??
divide by 2
(2/9)/(2)=a^2
times the reciprocal of 2 (1/2)(2/9) gives you (2/18). sqrt that and I got 1/3

so f(x)=2(1/3)^x

not sure if it is right, but did I go about the problem correctly or is there another way to solve this?

2007-08-28 06:09:40 · 3 answers · asked by m_carl 1 in Mathematics

2007-08-28 06:08:40 · 10 answers · asked by Anonymous in Mathematics

What will the reaction be?

If sulphuric acid is used instead of hydrochloric acid, what would be the salt formed?

2007-08-28 06:08:27 · 4 answers · asked by Booyah! 3 in Chemistry

true or false

2007-08-28 06:05:48 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-28 06:04:17 · 8 answers · asked by Anonymous in Astronomy & Space

How one can see the live satellite's picture of any place.like dheli,munger,satyanagar etc.

2007-08-28 06:03:57 · 7 answers · asked by VARATI 1 in Astronomy & Space

2007-08-28 06:01:59 · 12 answers · asked by Anonymous in Astronomy & Space

Why not 1 neutron attached to 2 protons?
Or 1 proton attached to 2 neutrons?

Why does it always have to be 2 neutrons and 2 protons attached to each other???

2007-08-28 06:00:14 · 4 answers · asked by Anonymous in Physics

can anyone state the type of thermometer and its history (who invented it... the one that can list out the most will get 10 points..!! thanks..



***by the way, don't ask me to google coz i already did...

2007-08-28 05:56:37 · 4 answers · asked by kit 3 in Physics

i.e. the human nose.
aside the fact that you would die trying

2007-08-28 05:50:41 · 8 answers · asked by Fabian 2 in Astronomy & Space

mass spectrometer

2007-08-28 05:47:58 · 7 answers · asked by Anonymous in Chemistry

Is the magnitude comparator a 2 input or 4 input one?

2007-08-28 05:47:14 · 1 answers · asked by jytopy 4 in Engineering

There must be a precise answer.......

2007-08-28 05:44:25 · 20 answers · asked by Anonymous in Physics

I had a weird dream, and in my dream i saw that Mercury was once earth it had life on it. I saw that the sun worked as a portal, the sun was getting closer and closer to Mercury and sucked it in and destroyed everything that lived, then earth came and grew life. And i saw that we are getting closer to the sun and maybe it might happen the same way it did Mercury. And then Mars will become the new earth. Thats why NASA is so interested in Mars and doing so much studies so they can be the first to live on Mars. But it wont work that way, because we are the aliens to the aliens on Mars lol. So does anyone think its possible that Mercury was once earth and had life on it?.

2007-08-28 05:42:42 · 8 answers · asked by Andrew L 1 in Astronomy & Space

The function f is defined for the domain -3 f(x) = 9 (x - 1/3)^2 - 11

(i) Find the range of f.

(ii) State the coordinates and nature of the turning point of
(a) the curve y = f(x)
(b) the curve y = If(x)I

2007-08-28 05:41:08 · 3 answers · asked by plolol 2 in Mathematics

Let a_n, n =1,2,3... be a sequence of positive real numbers and let k >0. Let s_n = a_1 + a_2....+ a_n be the sequence of partial sums of a_n. Show that the series

1) Sum (a_n)/(a_n + k) and 2) Sum (a_n)/(s_n) converges if, and only if, s_n converges.

Thank you for any help.

2007-08-28 05:37:29 · 3 answers · asked by Melissa 1 in Mathematics

a) If there are numbers between 1 and 49, and 6 are to be drawn at random, what are the possible number of outcomes?
b) Imagine if I write 1,2,3,4,5 and 6 on a note book, and 1 - 49 written on small pieces (i.e. 49 small pieces of paper of paper) kept in a box, what is the probability that the 6 numbers i draw from the box are:
i) the same 6 number
ii) 5 matching numbers
iii) 4 matching numbers
iv) 3 matching numbers
v) 2 matching numbers
vi) 1 matching numbers
vii) no matching numbers

C) does the number of possible outcomes have an effect on the probability of matching numbers?

P.S. numbers once drawn cannot be repeated and I know it is not a permutation question. so 49P6 is not the right answer for the first question.

please give formulae aswell

2007-08-28 05:37:14 · 5 answers · asked by shafique_khan83 2 in Mathematics

... how does that work. When you open your homes back door and front door and you get a powerful breeze streaming through the house.

Same thing happened in the car earlier. I was parked up and opend both drivers and passengers windows which resulted in a pleasant breeze

2007-08-28 05:32:38 · 14 answers · asked by Anonymous in Physics

If the quasars are at the outer edge of the expanding universe, what is beyond them? I say it's just empty space, my husband says there is literally nothing - that space is created by the universe expanding. (It's one of the few things we fight about).

2007-08-28 05:30:05 · 9 answers · asked by Anonymous in Astronomy & Space

the speed of a particle doubles and then doubles again because a net external force acts on it. Does the net force do more work during the first or the second doubling? explain

2007-08-28 05:26:52 · 4 answers · asked by i-sena 1 in Physics

How many pairs of ear ossicles are there?

2007-08-28 05:26:44 · 3 answers · asked by Anonymous in Biology

mathematics

2007-08-28 05:21:29 · 6 answers · asked by srohi_786 1 in Mathematics

i don't think there are any random experiments... they jus happen randomly cause the experiments are not repeated under the "same" conditions...

2007-08-28 05:18:06 · 5 answers · asked by Kai 1 in Physics

If the perimeter of a rectangle is 26 ft and the width is 9 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.]

2007-08-28 05:17:37 · 9 answers · asked by Anonymous in Mathematics

A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?
A) 1%
B) 1.5%
C) 2%
D) 2.5%

2007-08-28 05:16:43 · 4 answers · asked by Anonymous in Mathematics

Please help. I am stuck and my text does not give an example for these. How do I solve this problem? Please include how to solve. Only solving the problem will not really help. thank you thank you!!

The average profit per unit for Product A is $5.51, Product B is $9.08, and Product C is $13.89. If the percentages of each sold are 29, 30, and 41 respectively, what is the weighted mean profit per unit?

2007-08-28 05:15:42 · 5 answers · asked by jane d 1 in Mathematics

Evaluate. 5 • 4 ÷ 2 – 4^2

2007-08-28 05:12:25 · 11 answers · asked by Anonymous in Mathematics

2007-08-28 05:09:11 · 13 answers · asked by CINDY D 1 in Astronomy & Space

Consider the graph of y = ex.
(a) Find the equation of the graph that results from reflecting about the line y = 5.
I tried to plug in 5 for x but that is not correct so for example, e^-5 was not correct.

I'm lost as to what the question is asking me.

2007-08-28 05:06:49 · 4 answers · asked by m_carl 1 in Mathematics