Saturday

December 20, 2014

December 20, 2014

Total # Posts: 2,051

**chemistry**

Assume that you have 2.10 of the deadly gas hydrogen cyanide, . What is the volume of the gas at STP?
*November 2, 2011*

**General Chemistry**

c3h8+5o2 3co2+4h2o How many kg of propane only is in a 20lb tank?
*October 30, 2011*

**Chemistry**

I got that delta H=-24.4 and delta G=-24.3... But keep getting the equilibrium constant (K) wrong... Can someone please help...
*October 30, 2011*

**Chemistry**

a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
*October 30, 2011*

**math**

give the answer to two decimal places: 89 / 43 =
*October 30, 2011*

**outline writing**

I need help writing an outline for what I have written here. I would like to do my assignment of Microbes, more to the point on how microbes help us. When most people think of microbes they think for bad bacteria or the ugly side of what microbes does. I have been researching ...
*October 30, 2011*

**Microbiology**

I need help writing an outline for what I have written here. I would like to do my assignment of Microbes, more to the point on how microbes help us. When most people think of microbes they think for bad bacteria or the ugly side of what microbes does. I have been researching ...
*October 30, 2011*

**Can u help me Ms. Sue...Stats**

okay thank u
*October 25, 2011*

**Can u help me Ms. Sue...Stats**

oh...its okay...do u know who can help me? no one seems to be helping me :(
*October 25, 2011*

**Can u help me Ms. Sue...Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011*

**Can u plz help me PsyDag?? Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011*

**Is this right?? Stats....**

great i wasn't so sure about the last 2 thank you :)
*October 25, 2011*

**Is this right?? Stats....**

Classify the following as discrete or continuous random variables. (A) The time it takes to run a marathon (B) The number of fractions between 1 and 2 (C) A pair of dice is rolled, and the sum to appear on the dice is recorded (D) The length of a broad jump I got: (A) ...
*October 25, 2011*

**Is this right?? Stats....**

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.12??
*October 25, 2011*

**PLZ help!! Stats....**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011*

**Stats**

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.11??
*October 24, 2011*

**Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 24, 2011*

**Stats**

Classify the following as discrete or continuous random variables. (A) The time it takes to run a marathon (B) The number of fractions between 1 and 2 (C) A pair of dice is rolled, and the sum to appear on the dice is recorded (D) The length of a broad jump I got: (A) ...
*October 24, 2011*

**Stats**

A bag of colored blocks contains the following assortment of colors: red (18), blue (14), orange (20), purple (14), green (10), and yellow (4). Construct the probability distribution for x. I'm so lost....
*October 24, 2011*

**PLZ HELP....STATS**

You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
*October 23, 2011*

**NEED HELP PLZ!!! STATS**

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...
*October 23, 2011*

**Stats**

USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Is this a ...
*October 23, 2011*

**Stats**

You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
*October 23, 2011*

**Stats**

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...
*October 23, 2011*

**Stats**

Oh....I understand a little better now...thank you!
*October 20, 2011*

**Stats**

The linear correlation coefficient is a numerical value that ranges from -1.00 to +1.00. Describe in a sentence or two the meaning of each of these correlation coefficients: a) -1.00 b) +1.00
*October 20, 2011*

**Statistics**

So they are all probability distributions?
*October 20, 2011*

**Statistics**

USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Is this a ...
*October 20, 2011*

**Statistics**

The following data lists the average monthly snowfall for January in 15 cities around the US: 29 26 6 46 17 34 15 45 19 43 37 6 9 33 37 Find the mean, variance, and standard deviation.
*October 17, 2011*

**Plz help me Sue!!**

oh....so i get x = 53??
*October 16, 2011*

**Plz help me Sue!!**

Did i do that correctly??
*October 16, 2011*

**Plz help me Sue!!**

81 = (x + 352)/5 81 = 352x/5 81 = 70.4x x = 1.15??
*October 16, 2011*

**Plz help me Sue!!**

Starting with the data values 70 and 100, add three data values to the sample so that the mean is 81, the median is 91, and the mode is 91. How do i do this??
*October 16, 2011*

**Statistics**

Starting with the data values 70 and 100, add three data values to the sample so that the mean is 81, the median is 91, and the mode is 91. How do i do this??
*October 16, 2011*

**Stats....plz help....**

can u plz help me with the other problem i posted? i need help so bad! thank u!!
*October 16, 2011*

**Stats....plz help....**

ok thank u!!
*October 16, 2011*

**Stats....plz help....**

5.04? but how did u come up with multiplying it by 9? because it's the highest number?
*October 16, 2011*

**Stats....plz help....**

001136688999??
*October 16, 2011*

**Stats....plz help....**

Rank the following data in increasing order and find the position and value of the 56th percentile. Please show all of your work. 0 1 6 8 9 9 8 6 3 1 0 9 How do i find the position and value of the 56th percentile??
*October 16, 2011*

**Math-confused...plz help**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of...
*October 16, 2011*

**Please tell me if i did this correct**

Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25 This is what I got: Mean = 59.19 Variance = 1.43 Standard Deviation = 2.05
*October 16, 2011*

**Stats**

still confused....
*October 15, 2011*

**Stats**

Start with x=75 and add four x values to make a smaple of five data such that the standard deviation of these data equals 0.
*October 15, 2011*

**Stats**

so the SD = 30??
*October 15, 2011*

**Stats**

V = 30^2 = 900??
*October 15, 2011*

**Stats**

A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 30
*October 15, 2011*

**Stats**

001136688999?? How do I find the position and value of the 56th percentile?
*October 15, 2011*

**Stats**

Rank the following data in increasing order and find the position and value of the 56th percentile. Please show all of your work. 0 1 6 8 9 9 8 6 3 1 0 9
*October 15, 2011*

**Stats**

yay!! thank u!!
*October 15, 2011*

**Stats**

Z = 64-51/5.0 = 13/5.0 = 2.6 Z = 47-51/5.0 = -4/5.0 = -0.8 Is this correct?
*October 15, 2011*

**Stats**

A Math test has a mean of 51 and standard deviation of 5.0. Find the corresponding z scores for: I. a test score of 64 II. a test score of 47
*October 15, 2011*

**Stats**

okay so the first would be 0.75 correct? the second one would be 3 = -16.46 -3 = -16.46 is this correct?
*October 15, 2011*

**Stats**

1. Z = (s-205)/11 = 205/11 = 18.63??? This one confuses me 2. I have no idea how to do this.... Please help!!
*October 15, 2011*

**Stats**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of...
*October 15, 2011*

**Stats.....plz help me.....**

Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25
*October 14, 2011*

**Math**

How are z scores and the "empirical rule" related?
*October 13, 2011*

**Math Help**

looks correct to me
*October 13, 2011*

**Stats**

Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25
*October 13, 2011*

**Can someone help me please?**

Statistics confuses me....thank you for your help :)
*October 13, 2011*

**Can someone help me please?**

A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20
*October 13, 2011*

**algebra**

3/4 times 11/9 times 90 times 21/90
*October 12, 2011*

**Help plz!! Math....**

hmmmm....this is so confusing for me....
*October 12, 2011*

**Help plz!! Math....**

I apologize...thank you....so is it A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0
*October 12, 2011*

**misin ideas**

regular aerobicise an individual more endurance tha show cause and effect
*October 11, 2011*

**Chemistry **

When a 5.50g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee cup calorimeter, the temperature of rises from 21.6 degrees C to 37.8 degrees C. Calculate Change of heat for the reaction in kJ (also in kJ/mol NaOH) for the solution process. Assume the ...
*October 10, 2011*

**algebra**

Find the length of the golden rectangle whose width is 14.72
*October 9, 2011*

**Fibonacci numbers**

I have been working on this question all day and can not figure out what to do. The question says according to the Quadratic Formula, the solutions of x^2-x-1=0 I know the positive solution is the golden rule ratio and the negative solution is the conjugate of 0(with a slash ...
*October 9, 2011*

**algebra - reply to answer**

why is this a poor model for hitting a baseball? y = -0.002x^2 + 0.879x + 3.981 I know it gets hit at approx. 4 feet high. The -a gives the right shape like a hill. There's a -4.48 and 443.95 zero, which can be hit for distance. The max is (219.75, 100) so that seems ...
*October 9, 2011*

**algebra Please Help**

New question: A baseball was 2.74 feet above ground when it was hit. It reached a max. height of 116.3ft when it was approx 215.3 ft away from where he hit the ball. The ball lands after travelling a ground distance of approx 433.1 ft. Find an equation of form y = A(x-h)^2 + k...
*October 9, 2011*

**algebra**

why is this a poor model for hitting a baseball? y = -0.002x^2 + 0.879x + 3.981 I know it gets hit at approx. 4 feet high. The -a gives the right shape like a hill. There's a -4.48 and 443.95 zero, which can be hit for distance. The max is (219.75, 100) so that seems ...
*October 9, 2011*

**algebra**

Suppose the ball was 2.74 feet above ground when it was hit. It reached a max. height of 116.3ft when it was approx 215.3 ft away from where he hit the ball. The ball lands after travelling a ground distance of approx 433.1 ft. -- find an equation in form of y=C(x-z1)(x-z2) ...
*October 8, 2011*

**Microeconomics**

Baseballs cost $5 and baseball gloves cost $20. Assume you have $100 total to spend on these items. Construct a table similar to the one on page 158. What is the point, based on the Equimarginal Rule, that has equal marginal benefit (or the closest) for the two purchases?
*October 8, 2011*

**Biology**

Can DNA control how many teeth we will have?
*October 6, 2011*

**Fibonacci Numbers**

Thank you Jennifer! I just figured out where I went wrong in wording the problem. a= 2x8=16 b=2x15=30 c=9+25=34 16^2+30^2=34^2 256+900=1156 1156=1156 Thank you for helping to guide me in the right direction. One more problem to go by Friday...I just may be calling on you!
*October 3, 2011*

**Fibonacci Numbers**

I think it is the fibonacci numbers and the wording of the word problem. I thought I had to add 4 and 2 together to get the 6 and then square it. I am just confused. Thanks
*October 3, 2011*

**Fibonacci Numbers**

This is not a test question, but I did not know what the appropriate topic for my question is. If I used the terms 2, 3, 4, 8 consecutive terms of the Fibonacci sequence. "a" is the first and fourth terms and "b" is twice the product of the second and third...
*October 3, 2011*

**biology**

Hi there! I have this question for my bio/genetics homework, and I can't seem to figure it out. It reads, "A true-breeding red snapdragon is crossed to a true-breeding white snapdragon. The F1 progeny are all red. When the F1 is selfed, the following F2 progeny are ...
*October 3, 2011*

**Fibonacci numbers**

I have three problems to answer dealing with Fibonacci numbers. I understand the first two, but would like for reassurrance that they are correct and lost on the last one and could use some help. Thank you. 1. Fibonacci numbers can not be used more than once. Find sums for ...
*October 2, 2011*

**statistics**

For a distribution in which the mean is 100 and the standard deviation is 12, find the following: the percentile of a score of 106.
*September 30, 2011*

**PHYSICS! HELP PLEASE**

start the shopper at (0,0) After pushing the cart 43 m south, he's now at (0, -43) After turning west and pushing the cart 15 m, he's now at (-15, -43) Now he has to turn 90 degrees again. . . he will then be going either north or south. . . south will result in the ...
*September 27, 2011*

**economics**

Looks right to me!
*September 26, 2011*

**Science**

A 73 kg student traveling in acar with a constant velocity has a kinetic energy of 1.3 x 10^4 J. What is the speedometer reading of the car in km/h?
*September 21, 2011*

**business law**

what is the gist of proximate cause? why do courts struggle with its concept?
*September 18, 2011*

**algebra**

p^2+p+4=0
*September 16, 2011*

**physics**

a ball is thrown up with an initial velocity 20m/s. using g=10m/s2, a) what's the maximum height it can reach. b) what is the magnitude and direction of the ball's velocity 1 second after it is thrown. c) what is the magnitude and direction of the ball's velocity 3...
*September 12, 2011*

**nursing evidence**

_ _ _ _ _ _ _ _ _ 1. Information used to conduct our lives _ _ _ _ _ _ _ _ _ 2. To solve a problem by collecting the necessary pieces of information and putting them together _ _ _ _ _ AND _ _ _ _ _ 3. Try several approaches until one works _ _ _ _ _ _ _ _ _ 4. Do what feels ...
*September 12, 2011*

**Chemistry**

It still doesnt make aense because the answer comes out to 240 liters.
*September 11, 2011*

**Chemistry**

I still do not understand.
*September 11, 2011*

**Chemistry**

Calculate the amount of 6 M nitric acid you need to add to fully react with .5 grams of copper and add a 20 percent excess.
*September 11, 2011*

**Trigonometry**

In a right triangle ABC, C = 90°, B = 38° 35' and a = 6.434 mi. Solve for all the missing parts using the given information. (Round each answer to three decimal places for sides and to two decimal places for angle.)
*September 9, 2011*

**Chemistry**

Never mind, I figured it out
*September 8, 2011*

**Chemistry**

A 41 g piece of ice at 0.0 degree Celsius is added to a sample of water at 8.6 degree Celsius. All of the ice melts and the temperature of the water decreases to 0.0 degree Celsius. How many grams of water were in the sample?
*September 8, 2011*

**chemistry**

thought it asked for school, why does it matter anyways
*September 6, 2011*

**Cypress**

Suggest any limitations to the use of recrystallization as a purification method for a solid.
*September 6, 2011*

**physics**

I'm suppose to draw velocity time and acceleration time graph for a rocket that is launched vertically into the air and falls back down to its initial height. We are to assume that x axis is up. So would I draw an curved figure like a downward parabola or a straight ...
*September 5, 2011*

**Chemistry**

The label on a 1-pint bottle of mineral water lists the following components. If the density is the same as pure water and you drink 3 bottles of water in one day, how many milligrams of each component will you obtain? calcium 28 ppm
*September 5, 2011*

**Chemistry**

In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are 2.80 inches in diameter and have a mass of 2.00g of silicon. How thick (mm) is each wafer if silicon has a density of 2.33g/cm^3? (The volume of a cylinder is V=(pi)r^{2}h.)
*September 5, 2011*

**chemistry**

nevermind, I just figured it out
*September 4, 2011*

**chemistry**

Suppose you have two 100-{\rm mL} graduated cylinders. In each cylinder there is 58.5mL of water. You also have two cubes: One is lead, and the other is aluminum. Each cube measures 2.0cm on each side. After you carefully lower each cube into the water of its own cylinder, ...
*September 4, 2011*

**Chemistry**

In the explosion of a hydrogen filled balloon, 0.50 g of hydrogen reacted with 4.0 g of oxygen to form how many grams of water vapor? (water vapor is the only product)
*September 4, 2011*

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