Science & Mathematics - 2 December 2007

2007-12-02 14:50:26 · 1 answers · asked by xpiinkladiiex 2 in Mathematics

Let f(x),g(x) be any rational functions of x (over the rational numbers).Show that f(r) = g(r) => f(-r) = g(-r). [Note that we assume that if f(x) or g(x) is p(x)/q(x) then q(r) =/=0; so, for example, q(x) = x^2 - d is not allowed. Hint: observe that since r is irrational if a,b,c,d are rational then a + br = c + dr => a=c and b=d]

2007-12-02 14:48:45 · 1 answers · asked by neo85888 1 in Mathematics

2007-12-02 14:46:24 · 6 answers · asked by mala v 2 in Botany

6. A biologist exposed a mosquito population to a moderate concetration of DDT, a powerful pesticide; approximately 2% of these mosquitos survived. These surving mosquitos were allowed to interdreed ane produce offspring. When the offspring were exposed to DDT, approximately 94% survived. Which of the following is the best conclusion you could draw from these observations alone?
a. DDT resistance is a benefical trait for mosquitos in the natural environment.
b. Exposure to DDT indused a mutation to DDT resistance which was inherited by the offspring.
c. A mutation for DDT resistance is a recessive gene and is expressed in homozygous individuals.
d. Exposure to DDT allows only those mosquitos to survive which already have genetic information for DDT resistance.
e. b&d are equally likely.

2007-12-02 14:45:27 · 4 answers · asked by Anonymous in Biology

Let f(x)=x^6+16x^3. Find the local minimum and maximum points and values of the function f(x).

This problem was on my third calculus test and I got half of it correct, but I believe in actuality that I got the entire problem right.

I came up with two critical values of (x=0, x=-2)

Local Minimum at x=-2, with a value of -64
Local Maximum at x=0, with a value of 0

Could someone please double check this problem for me to make sure that it is in fact incorrect.

Thank You

2007-12-02 14:45:25 · 7 answers · asked by james_walker004 2 in Mathematics

2007-12-02 14:41:28 · 4 answers · asked by snooptilly 1 in Zoology

If a shipwrecked crew drinks sea water, they will probably die. Why? (I need the scientific answer)

2007-12-02 14:41:16 · 1 answers · asked by Anonymous in Biology

2007-12-02 14:38:08 · 8 answers · asked by sad 1 in Mathematics

And what's a male ladybug (ladybird?) called?

2007-12-02 14:35:27 · 13 answers · asked by Leon 1 in Zoology

2007-12-02 14:34:49 · 1 answers · asked by Fred 5 in Botany

I heard that there is a "trick" or a phrase that you can use to memorize the electromagnetic spectrum.. Anyone know what it is?

2007-12-02 14:32:32 · 5 answers · asked by retrieverbark 2 in Physics

helppppp homework due 2morrow

2007-12-02 14:31:00 · 2 answers · asked by Anonymous in Zoology

how do carbonate minerals form typically?

2007-12-02 14:30:14 · 1 answers · asked by I dont know 1 in Earth Sciences & Geology

how clay and hydroxide mineral groups are formed?
where are the most sulfide minerals located and why?(volcanic or hydrothermal system)

2007-12-02 14:28:52 · 1 answers · asked by I dont know 1 in Earth Sciences & Geology

2007-12-02 14:26:31 · 1 answers · asked by Anonymous in Mathematics

2007-12-02 14:26:09 · 1 answers · asked by esmeralda g 1 in Mathematics

unit convertion problem

2007-12-02 14:26:08 · 2 answers · asked by ocire7 1 in Mathematics

2007-12-02 14:26:07 · 1 answers · asked by Anonymous in Mathematics

how pegmatites form and why unique minerals are found within them?

2007-12-02 14:25:53 · 1 answers · asked by I dont know 1 in Earth Sciences & Geology

2007-12-02 14:22:06 · 9 answers · asked by Anonymous in Mathematics

how do u solve for A and B

2007-12-02 14:19:08 · 2 answers · asked by Malvern100 1 in Mathematics

2007-12-02 14:18:37 · 1 answers · asked by Bob B 1 in Mathematics

Esther drove to work in the morning at an average speed of 45 miles per hour. She returned home driving that same route in the evening and averaged 30 miles per hour. If Esther spent a total of one hour commuting to and from work, how many miles did Esther drive to work in the morning?

2007-12-02 14:17:23 · 3 answers · asked by theshortaznswimmer 2 in Mathematics

2007-12-02 14:16:18 · 3 answers · asked by Anonymous in Mathematics

In the xy-coordinate plane, the graph of x=y^2-4 (y-squared minus 4)
intersects line L at (0,p) and (5,t). What is the greatest possible value of the slope of L?

2007-12-02 14:16:13 · 1 answers · asked by theshortaznswimmer 2 in Mathematics

2007-12-02 14:14:10 · 1 answers · asked by victorsinferno45 1 in Biology

find the volume of a freezer with length 3 feet, width 2 feet, and height 4 feet.

a. 24 ft^3 b. 9 ft^3 c. 9 ft^2 D. none of these

2007-12-02 14:12:21 · 11 answers · asked by sweety 2 in Mathematics

I found this sight http://www.ibiblio.org/lunar/school/index.html and I was seriously bummed when I found out that the sight had not been updated in over 11 years. I was wondering if anyone knew of a currant project like this one (if so pleas post a link to there website). If no one knows of such a group who would be interested in helping me to start one? It would basically be an online think tank, we would work on practical designs for launching systems, space craft, space stations, lunar and Martian colonies and whatever else we decide to work on (it doesn’t have to be space related). eventually we may even submit our ideas to the government or one or more corporations in an attempt to get funding for them (thou that’s quite a ways off if it happens at all)

Let me make a few things clear right now. First this would not be a fanfic or sci-fi group (so no transporters or warp drive), my hope is that even if nothing we design ever gets built maybe it will inspire something that will be built and lead to a better future. Second, let me say that you do not need a degree to join the think tank (I’ve never been to a day of collage and I’m the one starting the group).

2007-12-02 14:11:50 · 2 answers · asked by luphawk 2 in Astronomy & Space

2007-12-02 14:11:04 · 3 answers · asked by Anonymous in Engineering

squares from each corner and folding up the sides. If the volume of the tray is to be 160 cubic inches and x is to be an integer,what size squares should be cut from each corner?

2007-12-02 14:10:26 · 3 answers · asked by veggiesubextrapickels 1 in Mathematics