# Posts by Student

Total # Posts: 859

**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 wasn't 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...

*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 that's 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 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 the top of the glass is 3 feet below the top of the 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*

**Grammar**

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*

**Chemistry**

An element, M, reacts with oxygen to give an oxide of formula M3O4. A sample of M of 257 mg is placed in a 500.0 mL vessel containing oxygen at 0.991 atm and 23.0°C. After cooling the vessel back to the original temperature, the pressure was 0.813 atm. Calculate the molar ...

*February 2, 2008*

**biology**

How does the pressure reading of water vapor differ from that of a gas like oxygen or nitrogen? is it because its fractional while oxygen and nitrogen is functional?

*January 28, 2008*

**Chemistry**

Calculate the entropy change of the universe (in J/K) when 43.4 g of ethanol vapor is condensed in a laboratory at 20.4 oC. Report your answer in scientific notation to three significant figures. If something is condensed, does that mean the system gaines heat, or the ...

*January 27, 2008*

**Biology**

I know this is a difficult question, and its an answer that is not likely on google, but I'm just wondering what a T-bar ribbon is, in terms of synapses and biology (not the type of sandal). The answer doesn't have to be detailed, I just simply would like to know what ...

*January 22, 2008*

**English**

please help what is the best way to introduce to yours classmate?

*January 17, 2008*

**HELP WRITING A COLLEGE ESSAY!**

Hi! For one of my college essays I have to write a 300 word essay on how "the world is better with the computer chip". I just needed some help making an outline.. I know in the intro I should probably state the revolutionary things it has done (need help finding ...

*December 21, 2007*