Saturday

February 28, 2015

February 28, 2015

Total # Posts: 74

**Chemistry**

If 1.30g of steam at 100.0 ∘C condenses into 40.0g of water, initially at 31.0∘C, in an insulated container, what is the final temperature of the entire water sample? Assume no loss of heat into the surroundings.
*November 4, 2014*

**Chemistry**

Assuming an element's half-life is 3.6 years. How much of 2 grams of the element would remain after 10.8 years?
*October 24, 2014*

**statistics**

In the old days, we could buy 8 inch floppies for our computers on which to store our favorite programs and data. But, the manufacturing ability was not that good back then and 1% of these 8 inch floppies sold had a bad sector or two on them which made them have less memory ...
*July 10, 2014*

**statistics**

30 new babies were born yesterday in the hospital. If the average weight of a new born is 7.5 pounds with a standard deviation of 2.1 pounds, what is the probability of the average weight for these 30 newborns is between 7.2 and 7.6 pounds. Remember, all probabilities are ...
*July 10, 2014*

**statistics**

When using the normal approximation to the binomial, what is the standard deviation used in the standardization formula when approximating a binomial distribution with 226 trials and p=0.25? Please submit your answer with 4 decimal places
*July 10, 2014*

**statistics**

You have a box of 15 widgets whose average weight for each individual widget is 10 pounds with a standard deviation of 4.0 pounds. Based on this information, what is the standard deviation, taken to 4 decimal places, for the sample average of the weight of the widgets in the box?
*July 10, 2014*

**statistics**

When using the normal approximation to the binomial, what is the mean used in the standardization formula when approximating a binomial distribution with 123 trials and p=0.35? Please submit your answer with 2 decimal places
*July 10, 2014*

**statistics**

you have a box of 12 widgets whose average weight for each individual widget is 2.6 pounds with a standard deviation of 3.3 pounds. Based on this information, what is the mean, taken to 1 decimal place, for the sample average of the weight of the widgets in the box
*July 10, 2014*

**math**

A science teacher has a supply of 50% sugar solution and a supply of 80% sugar solution. How much of each solution should the teacher mix together to get 105 ML of 60% sugar solution for an experiment 70 ML of the 50% solution and 35 ML of the 80% solution 35 ML of the 50% ...
*December 24, 2013*

**Algebra 2**

u sub 18 if u sub0= 2/3n+3/4 please help
*October 31, 2013*

**algebra 1 study helps**

if you go to connections academy email me at cjrandom337 at gmail for answers to your whole test OK.
*May 30, 2013*

**physics**

I need help! i don't know how to do this problem. average atmospheric pressure at earth's surface is 1.01 x 10^5 N/m^2. Earth's radius is 6.37 x 10^6m. Show that the total weight of earth's atmosphere is about 5.15 x 10^19 N.
*May 28, 2013*

**Math (Combinatorics)**

A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or ...
*April 4, 2013*

**Spanish**

Mostly a good job, but a few edits are necessary: -la salud not el salud -comidas not comida -try "comiendo alimento (food) saludable puede mantener un cuerpo fuerte y ayudar con perder peso, pero de una manera saludable." -puede ayudar not puede ayuda -I would use ...
*March 14, 2013*

**Math**

Two cards are drawn in succession without replacement from a standard deck of 52 cards. What is the probability that the first card is a heart given that the second card is a diamond? (Round your answer to three decimal places.)
*November 28, 2012*

**geometry**

Idk
*July 9, 2012*

**English**

Is the word desperate an omitted syllable, omitted letter, or an added syllable?I think is is an omitted letter.
*March 26, 2012*

**AP Chemistry**

If .100 M NaCl (aq) is added slowly to a beaker containing both .120 M AgNO3 (aq) and .150 M Pb(NO3)2 (aq) at 25C which will precipitate first, AgCl(s)PbCl2(s)?
*January 5, 2012*

**math**

A horse gallops a distance of 10 kilometers in a time of 30 minutes. What is its average speed?
*October 24, 2011*

**math**

3x567
*October 5, 2011*

**chemistry**

Which of the following is best described as an acid-base reaction? 1. NaCl + AgNO3 !NaNO3 + AgCl 2. Ca + 2H2O ! Ca(OH)2 + H2 3. 2HgO ! 2 Hg + O2 4. KCl + NH4NO3 ! KNO3 + NH4Cl 5. NH3 + H2O ! NH+ 4 + OH−
*September 29, 2011*

**chemistry**

Given the following list from the activity se- ries of metals (from most active to least ac- tive) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to oc- cur? 1. Na(s) +Mn2+(aq) ! Na+(aq) +Mn(s) 2. Co2+(aq) + Al(s) ! Al3+(aq) + Co(s) 3. Cd(s) + Pb2+(aq...
*September 29, 2011*

**Chem**

A volume of equimolar strong acid like HCl is mixed with an equal volume of equimolar strong base like NaOH in a beaker of water. What exists after the reaction?
*September 29, 2011*

**Geography**

Awesome, thanks Ms.Sue!
*September 23, 2011*

**Geography**

The people of Africa vary greatly across the continent. Thousands of different ethnic groups occupy this vast continent. In two or three well-developed paragraphs, suggest two ways in which ethnic groups can differ from one another besides language Thousands of different ...
*September 23, 2011*

**Science**

What would happen to the amounts of solar radiation reflected and absorbed if a large aount of light colored dust was added to the air
*September 17, 2011*

**AP Chemistry**

A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.234 g; buret reading before titration 0.23 mL; buret reading after ...
*September 14, 2011*

**Chem**

If 0.03 moles of sulfuric acid is mixed with water to make 266 mililiter of solution, what is the molarity of H+? Answer in units of M.
*September 11, 2011*

**Chem**

How many milliliters of 1.5 M HCl must be transfered from a reagent bottle to provide 25 g HCl for a reaction? Answer in units of mL.
*September 11, 2011*

**Chem**

What mass of MgSO4 · 7H2O is required to prepare 700 mL of a 0.342MMgSO4 solution? Answer in units of g.
*September 11, 2011*

**AP Chem**

It takes 58 mL of 0.124 M KOH to neutralize 34.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in unites of moles/liter.
*September 11, 2011*

**AP Chem**

21.9 x (463.07/479.07)=21.1685 Must have done something wrong the first time. Is that right?
*August 24, 2011*

**AP Chem**

I got 156.356 grams, but it still says that's wrong.
*August 24, 2011*

**AP Chem**

An ore contains Fe3O4 and no other iron. The iron in a 51-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.9 g. What was the mass of Fe3O4 in the sample of ore?
*August 24, 2011*

**Math**

Can you check these questions for me? 1. Add: (3x^4-x+2)+(9x^5-x^2+x) 9x^5+3x^4-x^2+2 2. Add: (4x^3-2x^2+x+4)+(9-x^5-x^2+4x) -x^5+4x^3-3x^2+13 3. Subtract:(4x^4+3x+x^2)-(x^2-6+3x^3) 4x^4-3x^3+3x+6 4. Subtract: (5x-6)-(3x^3-2x^2) -3x^3+2x^2+5x-6 5. Subtract: (x-3x^4+2x^2)-(x^3+...
*August 18, 2011*

**Biology**

There are many differences between the two major cell types: prokaryotes and eukaryotes. However, the different structures and modes of organization perform basically the same functions. Briefly compare and contrast the different features or functions of prokaryotes and ...
*August 12, 2011*

**Geography**

Oops left this out Which of the following problems is not a result of Egypt's growing population? A. overcrowded cities B. emigration of educated professionals to other countries C. a diminishing food supply D. widespread unemployment I'm just about sure its either A or C
*August 3, 2011*

**Geography**

How were the traditional Southeast Asian farmers affected by European colonization? A. They became wealthy from the rising values of the cash crops they grew and exported to Europe. B. Unable to compare with large landowners, they were forced to leave their land and work on ...
*August 3, 2011*

**Geography**

Following the breakup of the Soviet Union, what are some of the major problems faced by many of the new countries? Many of the new countries didn't know how to become democratic. The people weren't used to having a choice, voting, or political parties. Where they lived...
*August 2, 2011*

**Geography**

Oh sorry, I was just wonderig does it flow right and make sense?
*July 31, 2011*

**Geography**

Discuss the process known as the "Four Modernizations" and how the attitude of the Chinese leaders in this area contrasted in response to the rise of democratic protests. When Mao Zedong died in 1976, a struggle happenned between the Gang of Four and a group led by ...
*July 31, 2011*

**Geography**

How do you think the existence of nearly 3,000 ethnic groups and 800 languages affect life in countries south of the Sahara? The countries south of the Sahara show more diversity and variety of culture than anywhere in the world. This region speaks more than a one third of the...
*July 6, 2011*

**Geography**

How has the Suez Canal been a catalyst for nationalism in Egypt? When the Suez Canal Company was nationalized on July 26, 1956 by Egypt's president, Gamal Abdel Nasser, he became a hero. He remains an iconic figure in the eye of many people in the Arab world. He was one of...
*July 6, 2011*

**Geography**

Thanks again!
*June 28, 2011*

**Geography**

How do the monsoons and the mountains influence the climate in South Asia? Include in your answer an analysis of how monsoons can be responsible for survival and hardship in this region. Monsoons greatly influence the climate in South Asia. In the winter, the winds blow from ...
*June 28, 2011*

**Geography**

Thank you very much! I didn't realize just how many grammatical mistakes i had. Here is my new answer with the grammar fixed (as far as I know) and with a new last sentence.
*June 28, 2011*

**Geography**

Do you think that the British influence in India was positive or negative? Explain your answer. I think that the British influence in India was both positive and negative. They helped ge the country on track by doing things such as ending slavery, improving schools, and build ...
*June 28, 2011*

**Geography**

Ok thanks!
*June 25, 2011*

**Geography**

What were the factors that played a significant role in the collapse of Russian control over Eastern Europe? My Answer: A main factor that played a significant role in the collapse of Russian control over Eastern Europe was a widespread hatred of a corrupt system. There was a ...
*June 25, 2011*

**Geography**

Thanks!
*June 24, 2011*

**Geography**

It has been said that Eastern Europe is a political region more than a physical region. Would you agree or disagree with this statement? You must provide a solid argument for your position. Eastern Europe is tied together as a political region since the end of world war 2. ...
*June 24, 2011*

**trigonometry**

Right answer
*January 4, 2011*

**math**

The net is 3 feet high. The distance from where the ball is hit to the net is 24 feet. Assume the ball travels in a straight line. At what height must a tennis ball be hit so that it will just pass over the net and land 21 feet away from the net on the other side?
*December 7, 2010*

**Chemistry**

2257 is the heat of vaporization of water.
*November 8, 2010*

**algebra 1**

15 by 45; 9 by 75
*October 28, 2010*

**Math**

A baseball is thrown up in the air from a height of 3 feet with an initial velocity of 23 feet per second. When does the baseball hit the ground?
*October 4, 2010*

**6th Grade English**

what is meant by graphic features and list 6
*October 3, 2010*

**chemistry**

Oh and leave a variable for the number you want. Solve.
*April 27, 2010*

**chemistry**

Plug the pressures into the P slots and the volumes into the V spots.
*April 27, 2010*

**chem help!!**

A sealed cylinder of gas contains nitrogen gas at 1.00 103 kPa pressure and a temperature of 14°C. The cylinder is left in the sun, and the temperature of the gas increases to 51°C. What is the new pressure in the cylinder?
*April 14, 2010*

**5th grade**

im writing a essay on a day at the park and i could use some help please thank u
*January 7, 2010*

**biology**

How would lgiht reaction be affected if there were no concentration gradient across the thlykoid membrane?
*November 12, 2009*

**Science**

Defining variables?
*September 14, 2009*

**social studies**

Who wrote the missouri compromise?
*March 18, 2009*

**Science**

stars
*January 7, 2009*

**social studies**

What is a mountain or a coastal community??
*August 24, 2008*

**Math**

I'm confused. I can't seem to make the answer out of what you have.
*December 10, 2007*

**Math**

Ok, so say I use the half angle formula in sin. I get: sin((pi/6)/2)= sqrt((1-sqrt3/2)/2). So sin(pi/12)=sqrt(2-sqrt3)/2 I get to here by multiplying the whole equation by (2/2). So from here, (whew) how to I get to pi/24
*December 10, 2007*

**Math**

I was wondering why you were using cosin the problem when the half angle formula for sin is +-sqrt((1-cosx)/2). I can get pi/12, but I can't figure out how to use that answer to get to pi/24
*December 10, 2007*

**Math**

I need the actual value like 1/2 or sqrt3/2.
*December 10, 2007*

**Math**

Find the exact value of sin(pi/24) So like i need like the value like sqrt3/2 but for pi/24... also if you could show me the steps so i could figure the rest out, that would be cool
*December 10, 2007*

**Math**

please...it's due tom. and I have no clue how to do it.
*December 9, 2007*

**Math**

Find the exact value of sin(pi/24) So like i need like the value like sqrt3/2 but for pi/24... also if you could show me the steps so i could figure the rest out, that would be cool
*December 9, 2007*

**Transformations-Algebra**

go across 3 then go up 3
*September 1, 2007*

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