Science & Mathematics - 31 October 2007

This is supposed to be 5th grade?

Anna's farm picked a total of 310 pumpkins. Anna separated the pumpkins into small and large. She sold the small pumpkins for $3 each and the large ones for $9 each. She sold all of the pumpkins for total sales of $1,950. How many small and large pumpkins did Anna originally pick?

2007-10-31 18:05:48 · 5 answers · asked by gauchogirl 5 in Mathematics

2007-10-31 18:05:18 · 7 answers · asked by Anonymous in Astronomy & Space

You have a container full of ice blocks in the fire, and before the ice blocks melt completely, you get the container out of the fire. Would you grab the recipient with your hands? Yes/No, why? I need well-founded physics-related answers.

I would do it.

2007-10-31 18:03:07 · 1 answers · asked by ddeity_inc 3 in Physics

2007-10-31 18:01:25 · 8 answers · asked by Wallid K 1 in Mathematics

2007-10-31 17:55:04 · 3 answers · asked by gr8ventura 1 in Mathematics

What biomes are best suited for raising crops and grazing livestock? Use the four principles of sustainability to come up with four guidelines for growing food and grazing livestock in these biomes on a more sustainable basis. Four principles: reliance on solar energy, biodiversity, nutrient recycling, population control.

2007-10-31 17:54:28 · 2 answers · asked by livelaughlove 2 in Earth Sciences & Geology

2007-10-31 17:51:22 · 4 answers · asked by ~!~lissa~!~ 1 in Medicine

solve for t.

i reeeally don't understand this factoring stuff -_-

2007-10-31 17:47:53 · 5 answers · asked by biatch 2 in Mathematics

2007-10-31 17:44:06 · 2 answers · asked by hellllloooooooo 1 in Earth Sciences & Geology

Here's what is happening where I am living. There was a 5.6 earthquake. However, the day before and that day, the sky was dark when all weather forecasts said it was gonna be sunny. Today, the sky was dark also and there was another earthquake. It was a small one though. Is this a coincidence, or is there something scientific?

2007-10-31 17:43:41 · 3 answers · asked by spidersam408 4 in Earth Sciences & Geology

provide structural support for the mitochondria

decrease the surface area so substances can’t diffuse in

increase the surface area to allow more space for ATP synthesis

house enzymes needed for digestion

2007-10-31 17:39:25 · 4 answers · asked by xunsunghero 2 in Biology

help me to find the right answer--
for the quadratic equattion--
x(race to the power 2)+7x+12
find me one of the roots of this equation from the choices
(A)7 (B)4 (c)-3 (D)3

2007-10-31 17:38:19 · 4 answers · asked by Moni P 3 in Mathematics

2007-10-31 17:32:48 · 4 answers · asked by mk 2 in Physics

Pulsar also manufactures a series of 19-in color television sets. The quantity x of these sets demanded each week is related to the wholesale unit price p by the following function.
p = -0.059x + 250 (0 x 12000)
The weekly total cost incurred by Pulsar for producing x sets is represented by the following function.
C(x) = (0.000008)x3 - 0.01x2 + 470x + 73000
(a) Find the revenue function R.
R(x) =
Find the profit function P.
P(x) =

(b) Find the marginal cost function C'.
C '(x) =
Find the marginal revenue function R'.
R '(x) =
Find the marginal profit function P'.
P '(x) =

(c) Compute the following values. (Round your answers to 2 decimal places.)
C '(2900) =
R '(2900) =
P '(2900) =

2007-10-31 17:31:49 · 1 answers · asked by Anonymous in Mathematics

I been reading an article about an asteroid, Apophis, that may pass, just barely hitting Earth in the year 2029, then possibly entering a gravitational "keyhole," shifting its orbit far enough to make it strike Earth in the year 2036.

My question is what exactly is a gravitational "keyhole"? I've tried to google it, wikipedi it, my research was unsucessful. The only answer I've found that it is some sort of imaginary hoop in space.

2007-10-31 17:27:51 · 4 answers · asked by Mrs. Victorious 5 in Astronomy & Space

it was somewhrere in usa! The big fire california? how did it start

2007-10-31 17:27:45 · 2 answers · asked by Anonymous in Geography

cells
tissues
systems
organs

2007-10-31 17:26:16 · 5 answers · asked by xunsunghero 2 in Biology

Suppose you are given the two liquids and told that one is a compound and the other is a mixture. How might you determine which was which? Describe one method you could use.

2007-10-31 17:26:03 · 3 answers · asked by dandelion 1 in Earth Sciences & Geology

can you help me find the points on the surface x^2 * y^2 * z = 1 that are closest to the origin?

2007-10-31 17:25:26 · 2 answers · asked by Anonymous in Mathematics

conducted an experiment with:
independent variable - presence of a sign (nominal value)
dependent variable - instances of illegal parking (nominal value)

we had readings over 3 weeks (pre-test week without stimuli, treament week with stimuli, post-test without stimuli) at 2 carparks (one control, one treatment)

which statistical test should I use?
if chi-square, which numbers should I compare (week? carpark? illegal? legal?)

2007-10-31 17:24:19 · 3 answers · asked by Anonymous in Mathematics

Especially those who just graduated medical school. Doesn't the medical degree grant them the title "doctor"?

2007-10-31 17:22:12 · 7 answers · asked by Anonymous in Medicine

ok im basically stuck in al laspects of algebra because i dont no how to factor. if i no what form it is and i no the steps involed i cna do it. obviously , but sometimes the forms i cant tell the difference. for instance. 5x^2+5x-30= 5(x-2)(x+3) according to the book. isnt this equation in the quadratic formula form. and that form states u multiple a x c and that answer adds to get b. IE 5 x 30 = 120 and add to get 5. but isnce the answer is -2, 3 . i dont get it. can someone please help me understand this.

2007-10-31 17:20:54 · 3 answers · asked by Anonymous in Mathematics

Give a big-O estimate of the product of the first n odd positive integers.

2007-10-31 17:16:03 · 1 answers · asked by Jean-Francois 5 in Mathematics

2007-10-31 17:15:50 · 3 answers · asked by Anonymous in Engineering

I know the answers... please help me work them out. Thanks!

The steel I-beam in the drawing has a weight of 8.00 kN and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? There is a triangle drawn with 70 degree angles on both the left and right sides.

2007-10-31 17:15:45 · 1 answers · asked by PinkyTrauma 2 in Physics

Once again... I have answers just need help figuring out how to work them out. This is almost a daily occurance for me.. so if you like physics questions I'm your girl!

. A bowling ball (m = 7.2 kg, r = 0.11 m) and a billiard ball (m = 0.38 kg, r = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

2007-10-31 17:14:06 · 1 answers · asked by PinkyTrauma 2 in Physics

Ksp = 1.8e-7

2007-10-31 17:11:32 · 1 answers · asked by Nicole G 2 in Chemistry

Which is more dominant and recessive? Hypothetically, if one parent came from a family of 100% blue eyes, and the other came from a family of 100% green eyes, which is the kid more likely to have?

2007-10-31 17:10:37 · 7 answers · asked by Sara For Life 3 in Biology

Once again, I know the answers just don't know how they were gotten. So please help if you can!

At what angle should a curve of radius 150 m be banked, so cars can travel safely at 25 m/s without relying on friction?

2007-10-31 17:07:46 · 1 answers · asked by PinkyTrauma 2 in Physics

I need help working these out. I have all the answers but it doesn't help when I don't know how they got them.

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to twice her weight as she goes through the dip. If r = 20.0 m, how fast is the roller coaster traveling at the bottom of the dip?

2007-10-31 17:05:53 · 1 answers · asked by PinkyTrauma 2 in Physics