Amelie
Most popular questions and responses by Amelie
Physics
A hanging wire made out of titanium with diameter 0.080 cm is initially 2.3 m long. When a 78 kg mass is hung from it, the wire stretches an amount 2.89 cm. A mole of titanium has a mass of 47.9 grams, and its density is 4.51 g/cm3. Based on these
asked on February 25, 2011 
Math
the radius of a circular car tire is 12.5 inches. Find the circumference. use 3.14 for PI. A 39.25 in B 46.4 in C 62.53 in D 78.5 in
asked on February 27, 2019 
Math
Name the geometric solid suggested by a file cabinet. A sphere B rectangular prism C pyramid D cylinder
asked on February 27, 2019 
Physics
One mole of tungsten has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter, so the centertocenter distance between atoms is 2.51×1010 m. You have a long thin bar of tungsten, 2.2 m long, with a square crosssection 0.16 cm on a
asked on February 25, 2011 
Math
A gift box is 12 inches long, 8 inches wide, and 2 inches high. how much wrapping paper is needed to wrap the gift box? A 272 in^2 B 192 in^2 C 384 in ^2 D 184 in^2
asked on February 27, 2019 
Math: Triand Test
Evelyn cut a wedge of cheese into the shape of a triangular prism like the one shown below. The shaded part represents one of the bases of the prism. 4 5 and 6 A formula for the volume of a triangular prism is V = Bh . Which equation can be used to ﬁnd B
asked on February 25, 2019 
Math
Find the length of a side square with an area of 169 in^2 A 338 in B 106 in C 26 in D 13 in
asked on February 27, 2019 
Intro to Probability
two construction contracts are to be randomly assigned to one or more of 3 firms I,II,III. A firm may receive more than one contract. if each contract has a potential profit of 90,000 dollars. find the expected potential profit for firm I. then find the
asked on February 23, 2008 
math
The city council has decided to add a 0.3% tax on motel and hotel rooms. If a traveler spends the night in a motel room that costs $55 before taxes, how much will the city receive in taxes from him? I am studying for a exam, would you also know a good
asked on October 18, 2010 
Math: Triand Test
A cylindrical pan has the dimensions shown below. A formula for the volume of a cylinder is V = Bh . Which equation best represents B , the area of the base of this pan in square inches?
asked on February 25, 2019 
PHYSICS PLS GUYSS
What does the slope of a Kinetic Energy V.S Gravitational Potential Energy graph represent? I found 1 but I don't know what it represents I know that PE+KE=constant
asked on April 5, 2016 
Math:Triand Test
The base of a juice glass is in the shape of a circle with a diameter of 5 centimeters. Which of the following is closest to the circumference of the base of the juice glass? (Use 3.14 for π.) A. 15.7 cm B. 19.6 cm C. 31.4 cm D. 78.5 cm
asked on February 25, 2019 
Math: Triand Test
5 The base of a juice glass is in the shape of a circle with a diameter of 5 centimeters. Which of the following is closest to the circumference of the base of the juice glass? (Use 3.14 for π.) A 15.7cm B 19.6 cm C 31.4 cm D 78.5 cm
asked on February 25, 2019 
Math
4. A pool in the shape of a rectangular prism has a width of 8 1/2 feet (ft), a length of 12 ft, and a depth of 8 ft. What is the volume of the pool? A 102 ft B 532 ft C 816 ft D 1,728 ft
asked on February 25, 2019 
Intro to probability,
My main problem is deciding with discrete distribution to use: BERNOULLI, BINOMIAL, DISCRETE UNIFORM, GEOMETRIC NEGATIVE BINOMIAL, OR POISSON. Every time I choose one, it's the wrong one. Is there some way I can easily find out which one to use. Because
asked on March 7, 2008 
math
If Leah is 6 years older than Sue, and John is 5 years older than Leah, and the total of their ages is 41. Then how old is Sue? How do you know what and, is, and older mean in mathematical terms?
asked on October 18, 2010 
Intro to probability
A certain pizza restaurant offers three different sizes of pizza and eight different toppings. How many distinct pizzas having two different toppings can be made? ====================================== I think part of the answer to the question is (8)\
asked on February 17, 2008 
Biochemistry
Consider the following kinetic parameter for a given enzyme: Km=4.7x105 M Vmax= 22 nmol/min/mg [i]=5x101 mM [s]=2x104 M Ki=3x104 M Calculate the rate of product formation in the presence of a competitive inhibitor. I know that I have to solve for Vo. I
asked on November 10, 2007 
Physics helllppp
8] Find the minimum stopping distance for a car moving at 108km/h if the coefficient of static friction between the tires and road is a) 0.9
asked on March 21, 2016 
Physics
In the approximation that the Earth is a sphere of uniform density, it can be shown that the gravitational force it exerts on a mass m inside the Earth at a distance r from the center is mg(r/R), where R is the radius of the Earth. (Note that at the the
asked on March 9, 2011 
Probability
MY MAIN PROBLEM IS FIGURING OUT WHAT DISCRETE DISTRIBUTION TO USE, BERNOULLI, BINOMIAL, DISCRETE UNIFORM, GEOMETRIC NEGATIVE BINOMIAL, OR POISSON. Every time I choose one, it's the incorrect one. Is there some way I can easily find out which one to use.
asked on March 6, 2008 
Intro to probability
Two balanced coins are tossed. What are the expected value and the variance of the number of heads observed? ================================== I'm confused on how to start. I don't know how many times im suppose to toss coin, and how to set up my table
asked on February 23, 2008 
Physics
Find the minimum stopping distance for a car moving at 108km/h if the coefficient of static friction between the tires and road is 0.9 I really don't understand pls helppp
asked on March 21, 2016 
intro to probability
In a study of particulate pollution in air samples over a smokestack, X1 represents the amount of pollant per sample when a cleaning device is not operating, and X2 represents the amount per sample when the cleaning device is operating. Assume that (X1,
asked on April 20, 2008 
Intro to Probability, please check my work.
A fair coin is flipped three times. You win $5 every time the outcome is heads. Let the random variable X represent the total number of dollars you win. (a) List the sample space. (b) Determine the probability function of X. ====================== Answer:
asked on February 17, 2008 
Intro to Probability
Widgets are produced at a certain factory by each of three machines A, B and C. These machines produce 1000, 600 and 400 widgets per day, respectively. The probability that a given widget is defective is 4% for one produced by Machine A, 3% if produced by
asked on February 17, 2008 
Intro to Probability
In a certain election, the incumbent Republican will run against the Democratic nominee. There are three Democratic candidates, D1, D2 and D3, whose chances of gaining the Democratic nomination are .50, .35 and .15, respectively. Here are the chances that
asked on February 17, 2008 
Physics
I need some help on doing the process of the following problem: A body falls freely from rest and half of his fall is done in the last second. Calculate the total time of the fall. I know that the time on the first path is t1. Also that I can equalize
asked on September 8, 2016 
physics
You observe someone pulling a block of mass 48 kg across a lowfriction surface. While they pull a distance of 3.0 m in the direction of motion, the speed of the block changes from 4.9 m/s to 7.7 m/s. Calculate the magnitude of the force exerted by the
asked on April 14, 2011 
Physics
You observe someone pulling a block of mass 48 kg across a lowfriction surface. While they pull a distance of 3.0 m in the direction of motion, the speed of the block changes from 4.9 m/s to 7.7 m/s. Calculate the magnitude of the force exerted by the
asked on April 14, 2011 
chemistry
Consider the following kinetic parameter for a given enzyme: Km=4.7x105 M Vmax= 22 nmol/min/mg [i]=5x101 mM [s]=2x104 M Ki=3x104 M Calculate the rate of product formation in the presence of a competitive inhibitor. I know that I have to solve for Vo. I
asked on November 11, 2007 
Algebra
On my quiz for (3x+2)^2, I wrote the answer as 21x=4. My teacher gave me a minus one, which meant it was half wrong. What is wrong about my answer? Thanks
asked on September 22, 2009 
Probability
1.) An octave contains twelve different musical notes (in Western music). How many different eight note melodies can be constructed from these twelve notes if: (a) no note can be used more than once? (b) any note can be used as often as you please?
asked on February 17, 2008 
College Physics
n the approximation that the Earth is a sphere of uniform density, it can be shown that the gravitational force it exerts on a mass m inside the Earth at a distance r from the center is mg(r/R), where R is the radius of the Earth. (Note that at the the
asked on March 8, 2011 
Algebra
I'm trying to solve the problem: 6ybracket 3y(y+7)bracket. I got an answer of 4y7 multiple times. However, my book said the answer is 4y+7. I do not see how the 7 can be positive. I distributed the negative, so therefore, the seven should be negative.
asked on September 22, 2009 
Algebra
I need to rationalize the denominator of 2/3 square root of five, (three being the index). My book suggests you should multiply this by 3 square root of 5^2 over 3 square root of 5^2. I thought the numbers that you rationalize the original with should be
asked on September 13, 2009 
intro to probability
For the sheetmetal stamping machine in a certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours. The prepair time X2, has a mean time to repair of 5 hours and a variance of 4 hours. a) If X1
asked on April 20, 2008 
Math: Factoring
I'm having a hard time factoring polynomials, especially 3rd degree. x^3+2x^2+4x8 x^35x^2+20x+12 I don't know how to begin. I thought long division, but what would I divide by?
asked on December 2, 2007 
Algebra
I am trying to simplify 24a^2/b^4 (the entire expression has a radical sign around it). I got 4a times the radical of 6a/b^4. However, my teacher said this isn't correct on my quiz. Why, and what is the right answer? Thanks!!!
asked on September 22, 2009 
Algebra
I had to factor 5x^310x^2+43x6. I got 5x(x^2+2x)+3(x2). My teacher said this was half right. What did I do wrong then? Thank you!!
asked on September 22, 2009 
Algebra
I am unsure how to factor x^38. Could you please explain?
asked on September 22, 2009 
math
Jim is able to sell a handcarved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him?
asked on October 18, 2010 
DNA
What nucleotide sequences do not code for proteins?
asked on September 29, 2010 
political science
How do local governments get their revenue in U.S.? and what are the sources?
asked on August 19, 2010 
Intro to Probability, check some of my work please
1.) An octave contains twelve different musical notes (in Western music). How many different eight note melodies can be constructed from these twelve notes if: (a) no note can be used more than once? (b) any note can be used as often as you please?
asked on February 17, 2008 
Math: determinants
If det(A)=7 A=  a b c   d e f   g h i  Find det(2A^1), det((2A)^1). Find  a g d   b h e   c i f 
asked on December 2, 2007 
Math
I am not asking for an answer, I´m just requiring some help to understand the following problem: How are graphs of the functions obtained from the graph of f? a. y= f(x) b. y= 2f (x) 1 c. y= f(x3) +2
asked on August 29, 2016 
Intro to Probability
MY MAIN PROBLEM IS FIGURING OUT WHAT DISCRETE DISTRIBUTION TO USE, BERNOULLI, BINOMIAL, DISCRETE UNIFORM, GEOMETRIC NEGATIVE BINOMIAL, OR POISSON. Every time I choose one, it's the incorrect one. Is there some way I can easily find out which one to use.
asked on March 5, 2008 
Intro to Probability
MY MAIN PROBLEM IS FIGURING OUT WHAT DISCRETE DISTRIBUTION TO USE, BERNOULLI, BINOMIAL, DISCRETE UNIFORM, GEOMETRIC NEGATIVE BINOMIAL, OR POISSON. Every time I choose one, it's the incorrect one. Is there some way I can easily find out which one to use.
asked on March 5, 2008 
Intro to probability
An octave contains twelve different musical notes (in Western music). How many different eight note melodies can be constructed from these twelve notes if: (a) no note can be used more than once? (b) any note can be used as often as you please?
asked on February 17, 2008

Math
B
posted on February 27, 2019 
Math
D
posted on February 27, 2019 
Math
I got D.
posted on February 27, 2019 
Math:Triand Test
thanks
posted on February 25, 2019 
Math: Triand Test
so that would be 15.7
posted on February 25, 2019 
Math
so that would be 816
posted on February 25, 2019 
Physics
Forget it I already obtained the answer. Is 3.41 seconds, right?
posted on September 8, 2016 
Physics
Also, I know the rest energies would cancel out.
posted on April 14, 2011 
precalc
Oh, I forgot to add the negative sign with 3/7.
posted on March 8, 2011 
precalc
1. Get the inverse of each side in cos(θ)=((3)/(7)). Cos^1 (3/7) = theta. 2. From trig identities, we know sin2θ = 2sinθcosθ Substitute that in for sin2θ and just solve since you figured out θ in part 1 and you were given what cosθ equals, which
posted on March 8, 2011 
chemistry
Dalton's Law states that the total pressure of a system is equal to the partial pressure of all the mixed gases. The equation looks like this. Ptotal = P1 + P2 + P3 + ... Assume that the temperature and volume is constant. When going to high altitudes, the
posted on April 11, 2010 
Algebra
x^3+448x?
posted on September 22, 2009 
Algebra
Yes, it is supposed to be a three, not a fourty three.
posted on September 22, 2009 
Algebra
I'm sorry I mistyped my answer. I said it was 21x+4. What is wrong with THIS answer? Thanks.
posted on September 22, 2009 
Intro to probability
thanks damon for your help
posted on February 23, 2008 
Intro to Probability
thanks damon
posted on February 23, 2008 
Intro to Probability
thank you drwls for your help I greatly appreciate it.
posted on February 23, 2008 
Probability
thank you damon
posted on February 17, 2008 
Intro to Probability, please check my work.
thank you drwls
posted on February 17, 2008 
Probability
posted twice, sorry
posted on February 17, 2008 
Intro to probability
oh, now wasn't that simple, thank you reiny
posted on February 17, 2008