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October 22, 2014

Posts by Student


Total # Posts: 565

Chemisty
In which cases are higher-energy photons released, with Li+ or Cu2+? How do you know?
March 9, 2010

Chemistry
Nitrogen and hydrogen react to form ammonia. Consider the mixture of N2 and H2 in a closed container. In this container there are 6 diatomic molecules of hydrogen and 6 diatomic molecules of nitrogen. assuming the reaction goes to completion draw a representation of the ...
March 3, 2010

Chem 1LB
just type it in. it works when its negative.
February 21, 2010

Chemistry
thanks Dr. bob.
February 21, 2010

HCA 270 Approaches to Valuation
Do your own homework. The rest of us earned our degrees
February 18, 2010

chemistry
for body diagonal. take face diagonal and square it and take edge diagonal and square it. add those 2 together than take the SQUARE ROOT of it. Answer. so its basically the a^2+b^2=c^2 equation.
February 8, 2010

math
where does 1.06 come from
January 27, 2010

math
Sheryl correctly answered 85% of the questions on her 200-question biology final. Fernando scored a 90% on his 180-question chemistry final. (a) Who answered more questions correctly? (b) Who answered more questions incorrectly?
December 8, 2009

math
The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there are 15 boys in the class, how many total students are in the class?
December 7, 2009

math
Simplify each of the following, if possible. Write your answers in the exponential form ab. (a) 24 • 25 • 28 (b) 34 + 2 • 34 (c) 250 • 250
December 4, 2009

math
Explain whether the set {0, 1, 2} is closed with respect to addition on whole numbers.
December 2, 2009

math
Oh another thing I forgot to add, the problem I have with this question is I don't know where to start, I know I need a graph and equation, but I don't know exactly where to start
November 20, 2009

math
The tides at Cape Capstan, New Brunswick, cause the depth of the water in the harbour to change. The tidal chart indicates that the tides have a high point of approximately 10 m at 2.00 pm and a low point of 1.2 m at 8.15 pm. A sailboat has a draft of 2m. The water needs to be...
November 20, 2009

physics
A spring with a force constant of 300 n/m is compressed 5 cm. What is the work done on the spring?
November 17, 2009

physics
Is it impossible to lose all of the kinetic energy in a collision? Or, does a ball which bounces several times before eventually coming to rest show how kinetic energy can completely disappear?
November 13, 2009

physics
in the cabin of a jetliner that cruises at a sped of 600/km/h, a opillow drops from an overhead rack. since the liner is moving so fast why doesn't the pillow slam into the omoartment when it falls?what is the horizontal speed of the pilow relative to the ground? And ...
October 28, 2009

physics 1
need wieght in lb.s an apple weighs 1N mass in kilograms give weight in lb.s
October 28, 2009

physics
Calculate in newtons weight of 2.5kg melon. and what is it's weight in pounds?
October 28, 2009

AED 200
How is it wrong to converse with other students and ask for help with homework?
October 20, 2009

math
they need common denominators, so: 1) find a common denominator. in this case, the lowest one is 24. 2) make both denominators = 24. 2/3 x 8/8 = 16/24 5/8 x 3/3 = 15/24 3) add them! 16/24 + 15/24 = 31/24 or 1 7/24
October 6, 2009

physics
soo for physics, we did a lab where we launched a cart on a track on the floor and recorded time, distance, etc. to figure out things. one of the questions on the lab is: can you think of a simple follow-up experiment that would allow you to determine how much the cart's ...
October 6, 2009

biology
The length of DNA HELIX occupied by one nucleotide pair is 3.4 angstroms. What is the length in angstroms of this unknown DNA fragment? How do you calculate Angstroms?
September 17, 2009

Biochemistry
Two molecules of DNA are the same size, but differ in base composition. One molecule contains 20 % (A + T) while the other contains 60 % (A + T). Which molecule has the higher T m? Why?(The m is a subscript of T) I'm not sure what T m is..or how to calculate it
September 17, 2009

Environmental Science
Your comments to the editor of your favorite magazine intrigued her enough to call you and request that you write an editorial, for which, you note with a little surprise, you will be well-paid. She provides you with two topics which she feels would be of great interest to ...
August 8, 2009

Math
Can anyone help me with this equation in math. here it is..... 5x x 18.75=93.75 does anyone no how to convert this into the anwser?
June 10, 2009

Algebra
This question was just some random one on a math sheet. There were no directions, and I"m not sure what to do. 5(x-3)=? Thanks!
June 6, 2009

Algebra
Solve by factoring: x^2+2x+4x+8=0 Thank you!
June 6, 2009

Algebra
Factor: 2x^4-4x^3y^2+8x^2y Thanks for the help!
June 6, 2009

HCA 210
In what ways do health care expenses affect an economy? What are the economic advantages to government involvement in health care? What are the economic disadvantages? What are some ways of curbing the negative impact of rising health care costs on an economy?
April 22, 2009

Psychology
Read the text book again, I have taken this course read the text book!!!!!!!!
February 8, 2009

Psychology
fkit, your attitude does not deserve help. Ms. Sue, was pointing out to you that there are not many sources available on the web and the text materials are most likely the most useful source you'll find. After seeking through Google for clarification, I too was not able to...
February 8, 2009

english
Hello, Where can I find more information about Aaron the moor in "Titus Andronicus" by Shakespeare? Prompt: As Tamara's star rises, so does Aaron's influences. How does he use it? What are his stated motives and confessed motives? Why can Aaron not act ...
December 31, 2008

11th grade CHEMISTRY TITRATION LAB!
alright thank you very much i appreciate it! :)
December 14, 2008

11th grade CHEMISTRY TITRATION LAB!
oh ok..i just wasnt sure if the vinegar was acetic acid because the procedure saud determining the concentration of acetic acid in an unkown sample of vinegar. thank you very much though! oh one last question, i understand the purpose of lab and how to conduct the lab but im ...
December 14, 2008

11th grade CHEMISTRY TITRATION LAB!
i have a tritation lab due tomorrow and i am stumped on a couple things. its a titration lab using sodium hydroxide (NaOH)- 250 mL 0.300 M concentration, 10 mL of an unknown substance of vinegar, the avg. of titrated NaOH in the flask with vinegar is 27.7 mL firstly its a ...
December 14, 2008

literature
Number 14 isn't A. I took the test and 14 was B.
December 9, 2008

Grade 11 Physics - Light Unit
We did an experiment of Snell's law of refraction and we shined a light through the centre of semicircular prism on a flat surface to measure the angle of refraction. That was one of our questions I didn't understand necessarily why.
December 6, 2008

Grade 11 Physics - Light Unit
Why must rays be shone in the centre of a flat surface? Describe the difficulty thats results if this is not done.
December 6, 2008

Astronomy -more help!
I checked out the graph, but when I go to 10^3 vertically, how far over am I looking. There are several lines, which one will tell me how much mass a star could have while on the main sequence to support life? thanks!
October 29, 2008

Grade 11 Physics
Oh so that the final result is 2(d-v2t) = a ________ -t2
October 5, 2008

Grade 11 Physics
Rearrange the equation : d=v2t - 1/2at(squared) to solve for a
October 5, 2008

11th grade
The arch of a bridge is a semi ellipse, the span is thirty feet and the top of the arch is ten feet above the major axis. the roadway is horizontal and is two feet above the arch. find the vertical distance from the roadway to the arch at five feet intervals in order to ...
September 28, 2008

Math
James Profit wants to take National Widget Company public. He is interested in the relationship between the size of the initial public offering and the price per share. A sample of 10 companies that recently went public revealed the following information: size($M)price per ...
September 15, 2008

Probability/Statistics
Please help!!! Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100 widgets at a time at the .08 level of significance. The specific standard requires ...
September 15, 2008

Population size Checkpoint
Explain the four factors that produce changes in population size. Which factors are affecting the population size in the video? What do you predict will happen to the nutria population after all the land is depleted of the nutrias’ food resource?
September 8, 2008

Ethnic Diversity
I agree..Axia needs to update,3 years later and it's the same checkpoint for the same week 5...and no new answers
September 2, 2008

ocenography
i have to search for a recent ocenaographic event to write a book report on has to be on the internet what is agood website or where should i go so i can read about it.....
August 28, 2008

Statistics
Need major help on this one. Sooo confused... Binomial distribution to solve the problems. There is a 60 percent probability that a store will sell one of Red bags to any customer who comes into the shop and views the bags. Out of the next 7 people who come into the shop, what...
August 24, 2008

Statistics
Need help! A normal distribution with a mean of 20 and a standard deviation of 2 is evaluated to solve a business problem. What is the probability that the value in the population is between 20 and 30? What is the probability that any value in the population is between 10 and ...
August 21, 2008

Stats
You are a health counselor and certified physical fitness worker for a local health club. You have been assigned to prove the beneficial results of your weight reduction program. You have pulled the files on 18 women, who all began your program six months ago and who are still...
August 13, 2008

Stats
A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon-to-1 p.m. lunch period. The waiting time (operationally defined as the time elapsed from when the customer enters the line until he or she ...
August 13, 2008

Stats
An article (N. Hellmich. "'Supermarket Guru' Has a Simple Mantra,” USA Today, June 19, 2002, p. 70) claimed that the typical super market trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a ...
August 13, 2008

Statistics .05 level
According to a survey conducted in October 2001, consumers were trying to reduce their credit card debt (Extracted from M. Price, “Credit Debts Get Cut Down to Size." Newsday, November 25, 2001, p. F3). Based on a sample of 1000 consumers in October 2001 and in ...
August 12, 2008

Statistics
testing for the differences between means of 2 independent populations where the variances in each population r unknown, u must first perform the F-test for the difference between 2 variances. Which of the following is correct? a)If the null hypothesis of the F-test is ...
August 12, 2008

Stats
If we are testing for the difference between the means of 2 independent populations presumes equal variances with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to a) 39 b) 38 c) 19 d) 18.
August 12, 2008

biology
they are actually five cells, sense and respond to change reproduce energy DNA
August 11, 2008

algebra
yes instead of being 612! needs to be 6!2!
August 11, 2008

algebra
i need explanation how they solved this one the answer is provided: finding the number o fdistinguishable permutations. (15!)/(4!3!612!) = 6, 306,300
August 11, 2008

math
i remember correctly i had this on one of my homeworks . 40-32 = 8 therefore 8% because if you subtract 40 - 8%
August 11, 2008

algebra
i need help in this one for the steps. find the therm that does not contain x in the expansion of ((8x) + ((1)/(2x))^8
August 11, 2008

algebra
i wrote down the incorrect problem sorry the actual problem is ((x) + ((1)/(x)))^40
August 11, 2008

algebra
i am lost in the steps i am working with binomial theorem to expand the expression. Finding the three first terms in the expanison of : ((x^2) -((1)/(2x) ^8)
August 11, 2008

Statistics
Thanks:)
August 11, 2008

Statistics-Part 2 (continued of Part 1)
a) No, and we are 90% sure of it. b) No. The proportion is 54.17%. c) Maybe. 0.60 is a believable value of the population proportion based on the information above. d) Yes, and we are 90% sure of it.
August 11, 2008

Statistics
A confidence interval was used to estimate the proportion of statistics students that are females. A random sample of 72 statistics students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, is the population proportion of females ...
August 11, 2008

Statistics
Thanks:)
August 10, 2008

Statistics
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 ft. It is known that the standard deviation in the cutting length is 0.15 ft. A sample of 70 ut sheets yields a mean ...
August 10, 2008

oceanography
i want to make sure i am answering this correctly. 1) the primary source of energy for ocean currents and waves is: the sun 2)as a wave passes in deep water, water parcels move in: almost closed circular orbits 3)which of the following is not a feature of simple waves? options...
August 8, 2008

Stats
The branch manager of an outlet of a nationwide chain of pet supply stores wants to study characteristics of her customers. In particular, she decides to focus on two variables: the amount of money spent by customers and whether the customers own only one dog, only one cat, or...
July 29, 2008

statistics help
For complete post, please see Statistics help with Statistics help Part 2 and Part 3
July 28, 2008

statistics help Part.3
The branch manager of another outlet (Store 2) wishes to conduct a similar survey in the store. The manager does not have access to the information generated by the manager of Store 1. Answer the following questions: c) What sample size is needed to have 95% confidence of ...
July 28, 2008

statistics help Part.2
- Amount of money spent: X = $21.34, S=$9.22 - 37 customers own only a dog - 26 customers own only a cat - 7 customers own more than one dog and/or cat a) Construct a 95% confidence interval estimate of the population mean amount in the pet supply. b) Construct a 90% ...
July 28, 2008

statistics help
The branch manager of an outlet (Store 1) of a nationwide chain of pet supply stores wants to study characteristics of her customers. In particular, she decides to focus on two variables: the amount of money spent by customers and whether the customers own only one dog, only ...
July 28, 2008

Math
4:6
July 16, 2008

science
what is a nanotube?
July 16, 2008

Chemistry
23
July 15, 2008

Chemistry Titration Lab HELP!
i have a titration lab with sodium hydroxide with an unknown vinegar all i know is we have 0.3 M sodium hydroxide solution (250 mL)and a 50ml burette that when titration was done the avg. of 3 trials was 27.7 mL im not sure what id write for the hypothesis of this lab or what ...
June 11, 2008

Chemistry
thanks for the answer :)
June 5, 2008

Literature-Poetry
Ashley's answers are wrong I used them and got a really really low score. Only 6 answers were right. Last time I use this to double check my answers, if I would of stuck with my original answers I might have passed but I thought I was wrong cause everyone said Ashley's...
May 28, 2008

ALGEBRA
youre my new bestfriend thanks msp!
April 16, 2008

ALGEBRA
my book says 1/5040 could you tell me how to get it
April 16, 2008

ALGEBRA
The colors red, orange, green, blue, indigo, and violet are written on slips of paper and placed in a hat. What is the probability that the slips will be chosen in the order of the colors of a rainbow (the order listed above)
April 16, 2008

I updated my intro paragraph, is it better?
Another question then. I think my teacher said the book titles are italicizesd, not underlined. What should I do?
April 7, 2008

English - Please correct this.
In both Midnight’s Children and The God of Small Things, idiosyncratic capitalizations are used abundantly in order to convey a deeper meaning from certain words in the text. This technique is employed throughout both novels in order to bring attention to the special ...
April 6, 2008

English
Well im comparing two authors in thier similar use of Capitalization in Certain Words at Certain Instances in the Book. What, in your opinion, is the PURPOSE of using caps?
April 6, 2008

English Essay Writing
Roy-Rushdie Outline 1. Introduction · Introductory Statement – In the genre of magical realism, there are two Booker Prize authors that have employed similar writing styles in their acclaimed novels. · Thesis Statement – The similarity of writing styles...
April 6, 2008

Chemistry
One half-cell of a concentration cell consists of a silver wire dipping into a 1.00 M solution of Ag+. The second half-cell consists of a silver electrode in a solution containing an unknown concentration of Ag+. The measured cell potential was determined as 226 mV at 25°C...
February 26, 2008

finance
Can someone please help me with the following question. I am not sure even where to start. A 5-year annuity of 10 $9,000 seminannual payments will begin 9 years from now, with the first payment coming 9.5 years from now. If the discount rate is 11 percent compounded ...
February 24, 2008

calculus
1. a large vertical rectangular plate of glass is to be inserted in the wall of an aquarium underwater so visitors can see into the tank fo fish. the glass is 10 feet high, 25 feet long and the top fo the glass is 3 feet below the top of the water. The pressure exerted by ...
February 12, 2008

Math
Thank you.
February 12, 2008

Math
I need to find the volume of a prism whose base is a hexagon with area 40 square mm and whose height is 30 mm.
February 12, 2008

Math
base is 40 square mm and height is 30 mm
February 12, 2008

calculus
1. a large vertical rectangular plate of glass is to be inserted in the wall of an aquarium underwater so visitors can see into the tank fo fish. the glass is 10 feet high, 25 feet long and the top fo the glass is 3 feet below the top of the water. The pressure exerted by ...
February 12, 2008

calculus
a large vertical rectangular plate of glass is to be inserted in the wall of an aquarium underwater so visitors can see into th tank of fish. the glass is 10 feet high, 25 feet long and hte top of hte glass is 3 feet below the top of hte water. the pressure exerted by water at...
February 12, 2008

chemistry-buffer
Buffer question: If I add 3 mL of 1 M NaOH to a buffered solution, will I still have a valid buffer?
February 4, 2008

Editing
Gordimer chooses to emphasise more so the physical, as opposed to emotional, invasion of the Immortality Act. Could someone please edit that sentence? It bothers me because it sounds awkward, especially the "physical, as opposed to emotional, invasion" part. Is there...
February 3, 2008

Grammer
which sentence is correct? "...an affair took place between her and dr. white" "...an affair took place between she and dr. white"
February 3, 2008

chemistry
I have already posted this and never got a response, please help. here is my data from lab: Buffer1: HPO4- weight 3.412g; original pH Buffer 2: HEPES wt: 1.090g original pH 10.08 buffer1: pH of 0.1M: 7.5; pH of 0.01: 7.72; pH of 0.001M: 7.87 buffer2: PH of 0.1M: 7.5 ph of 0.01...
February 3, 2008

chemistry
for A, correction: it is actually 50 mL of a 0.1 M TRIS. Here is the answer I got for A: A) pH= 2.3 For B, I got pH= 1.2
February 3, 2008

chemistry
I asked this before, but got no response. A) If you make up a solution of 250 mL of 0.1 M TRIS in the acid form, what will be the pH? B) If you add 2 mL of 1 M NaOH to the solution in part A, what will be the pH? Thanks.
February 3, 2008

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