Science & Mathematics - 12 February 2007

2007-02-12 15:12:43 · 3 answers · asked by jmartinme 2 in Medicine

I used substitution and got -1/2cos(x^-2), but when I checked it on mathimatica's site it gave me 1/2 cos(x^-2), any ideas why I got a negative and it didn't?

2007-02-12 15:11:55 · 3 answers · asked by Anonymous in Mathematics

Drag racing is an acceleration contest over a distance of a quarter of a mile. For a given total weight, the speed of a car at the end of the race is a function of the car's power. For a total weight of 3500 pounds, the speed s (in miles per hour) can be modeled by s = 14.8 3 (or 3rd power) to the square root of p where p is the power (in horsepower). Graph the model. then determine the power of a car that reaches a speed of 100 miles per hour.


please show work because i have NO CLUE

2007-02-12 15:10:10 · 1 answers · asked by harry p 1 in Physics

a^2(2a+6b-7)+a(2a^2-6ab+a)

The answer is 4a^3-6a^2

HELP..How did this occur?

2007-02-12 15:10:02 · 11 answers · asked by Anonymous in Mathematics

40 students have no brothers and sisters
100 students have 1 brothers and sisters
125 students have 2 brothers and sisters
33 students have 3 brotherss and sisters
10 students have 4 brother and sisters
NO students have 5 brothers and sisters
5 students have 6 brothers and sisters

Find the average number of brothers and sisters. How do you do that?

2007-02-12 15:09:33 · 8 answers · asked by      7 in Mathematics

im studying about perception and conscious when taking foreign substances

2007-02-12 15:08:22 · 1 answers · asked by Anonymous in Chemistry

solve for x:

6(x – 2) + 1 = 10x – 3 – 5x

2007-02-12 15:07:56 · 11 answers · asked by Brackish 1 in Mathematics

I am looking for answers to help understand the relationships between statistical inference, theory of probability, and sampling to write a comprehensive essay.

2007-02-12 15:07:31 · 1 answers · asked by yochster 1 in Mathematics

2007-02-12 15:06:00 · 2 answers · asked by Gabe S 1 in Botany

If yes, please explain how it can be possible.

2007-02-12 15:03:52 · 3 answers · asked by nachu 1 in Physics

Find the inverse, meaning F^-1...for the equation (1/x). I get to the point where I switch the variables meaning y=(1/x) to x=(1/y), but I get lost after that. Any help is thanked

2007-02-12 15:03:29 · 6 answers · asked by Willie M 1 in Mathematics

A roof rises 9.75 ft over a horizontal distance of 17.24 ft. What is the slope of the roof to the nearest hundredth?
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Given f(x) = 5x2 – 3x + 1, find f(–2).
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The length of a rectangle is 1 in. more than twice its width. If the perimeter of the rectangle is 26 in., find the width of the rectangle.
thanks

2007-02-12 15:02:34 · 6 answers · asked by dee free 2 in Mathematics

In a deck of the standard 52 playing cards , one card is randomly picked . What are the odds that the card is a diamond or a 5 .
PLease help me . I have a C and its 11 pm and I'm tired.

2007-02-12 15:02:18 · 4 answers · asked by Anonymous in Mathematics

I did a science fair project on this. My results were A. The judge thought I was a quack. Any comments?

2007-02-12 15:01:15 · 4 answers · asked by ktskins 3 in Biology

i am asking the most natural way of keeping the eggs fresh. no resorting to refrigeration, no cryogenics, no side bowl full of water...just as nature intended it to be.

2007-02-12 15:01:04 · 3 answers · asked by robbins 2 in Biology

Determine the volume in milliliters of sodium hydroxide, NaOH, which will be needed to react with 35.0 ml of .075 M of sulfuric acid, H2SO4, by the following equation. The concentration of the NaOH solution is 0.35M.

I need to see how this problem is done. I don't understadn it at all.

2007-02-12 15:00:44 · 1 answers · asked by shane200388 1 in Chemistry

Solve the following equations

2007-02-12 14:59:08 · 23 answers · asked by Anonymous in Mathematics

what is the relationship of the sides of the right triangle to its hypotenuse.basically its research on the pythagorean theorem created by pythagoras.

2007-02-12 14:56:53 · 10 answers · asked by PP 1 in Mathematics

"q" is a rational number and "a" is a real number but not a rational number: Prove that q+a is irrational

2007-02-12 14:56:50 · 2 answers · asked by brwnsugar2spice 1 in Mathematics

3(x – 2) – 2x = x – 6
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4x + 8> 3x + 16
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5x – 4y = 20
thanks

2007-02-12 14:56:38 · 3 answers · asked by dee free 2 in Mathematics

2007-02-12 14:53:40 · 4 answers · asked by Christina W 1 in Weather

How do you solve these heat/temperature questions?

1. How many kilograms of water at 100.0°C can be converted to steam by the addition of 1.13 x 10^7 joules of thermal energy? (L =2.26 x 10^6 J/kg)

Do I use two equations, Q=mcΔT and Q=mL? What I do know is this is a vaporization, that's all.

2. Calculate the energy needed to change 25 g of ice at -15.0°C to steam at 130.0°C. The specific heat of ice is 2.06 x 10^3 J/kg C° and of steam is 2.02 x 10^3 J/kg C°.

I simply have NO idea how to approach this one.

Thank you!

2007-02-12 14:53:39 · 2 answers · asked by Anonymous in Physics

oxygen is flammable....

2007-02-12 14:53:27 · 3 answers · asked by trisha 2 in Chemistry

2007-02-12 14:53:19 · 3 answers · asked by cooldude 1 in Earth Sciences & Geology

so i need someone to explain to me, in a nutshell, the exact use of a Chi-square when doing genetic problems.

=)

2007-02-12 14:53:05 · 1 answers · asked by justwondering 4 in Biology

PLEASE SHOW THE STEPS. ^2 means squared

#1 Factor

72-22x +x^2


#2 Factor

x^2 + x - 6


#3 Factor

x^2 - 5x -24


#4 Factor

3x^2 + 11x + 10


# 5 Factor

4x^2 + 7x -2


#6 Factor

16y^2 = 25

# 7 Factoring

x^2 - 5x + 6 = 0


# 8 Factor

2x^2 - 9x - 5 = 0


# 9 Factor


3x^2 + 5x - 2 = 0



Thanks Bunches!!! Best answer to first person to get them right and do them all. THANKS!

2007-02-12 14:49:57 · 6 answers · asked by Fruits_Basket_Lover 2 in Mathematics

I have a review question and I know the answer because it is in the answer book. What I need to know is how the 13 power of 2 comes in.
5x(3x+2y-2)-2x(x-5y+3)

This is what I did:
5x(3x) -2x(x) 5x(+2y )-2x(-5y )5x(-2)-2x(+3)
15x -2x -10xy -10xy -10x -6x
13x -20xy -16x

But somehow the 13x is 13x^2
I don't understand that?

2007-02-12 14:49:31 · 5 answers · asked by Anonymous in Mathematics

a person burns her finger on a hot stove. She inmediately puts her finger in cold water.
Did the stimulus go only to the spinal cord, to her cerebrum or both?

2007-02-12 14:48:56 · 6 answers · asked by ABC 4 in Medicine

I need to know how to enter 6.02 x 10 (to the power of 23) on a calculator - I have limited science/math knowledge - please help! Thanks.

2007-02-12 14:48:46 · 4 answers · asked by Emma 1 in Chemistry

If the decimals .35,1.6,.4 and .25 are all changed to fractions,and the sum of the first two fractions is divided by the sum of the last two fractions,what is the resulting amount?

2007-02-12 14:48:01 · 4 answers · asked by Darren H 1 in Mathematics