Thursday

September 18, 2014

September 18, 2014

Total # Posts: 91

**Statistics**

In a random sample of 50 undergraduate students at a college, it was found that 44 students regularly access social networking websites from their college library. What is the margin of error for the true proportion of all undergraduates who access social networking sites from...
*May 19, 2014*

**math**

the surface of the top layer of a circular sand pit is about 160 square feet. estimate the radius of the sand pit, to the nearest foot
*May 6, 2014*

**Geography**

Identify three perceptual factors that affect Egypt regionalization
*April 8, 2014*

**calc**

Find the area of the indicated region. Enclosed by y = −x and y = x4
*December 15, 2013*

**business calc**

evaluate the integral from 4 to 3. x/2x^2-6dx
*December 15, 2013*

**Science**

It means that shells of deceased animals and grains and weathered rocks came from the inland with the wind, rain, etc
*December 4, 2013*

**Science**

A sandy beach is essentially where pulverized, weathered rock along with some fragments of shelled creatures and other biota have collected, tossed up by the waves and as sediment from inland areas.
*December 4, 2013*

**Chemistry**

SHOW WORK A 44g sample of CO2 has a volume of 22.4 L at STP. The sample is heated to 71 degrees Celsius and compressed to a volume of 18.0 L. What is the resulting pressure?
*December 4, 2013*

**Chemistry**

SHOW WORK A cylinder contains 98g of air at 295K. The pressure in the cylinder is 174psi. If 32g of air are allowed to escape and the cylinder is heated to 335K, what is the new pressure?
*December 4, 2013*

**Chemistry**

SHOW WORK A cylinder contains 36.5g of argon gas at a pressure of 8.20atm. The valve is opened and gas is allowed to escape until the pressure is reduced to 4.75atm at constant temperature. How many grams of argon escaped?
*December 4, 2013*

**Chemistry**

SHOW WORK A cylinder contains 22g of air. If 77g of air are pumped into the cylinder at constant temperature, how does the pressure in the cylinder change?
*December 4, 2013*

**Chemistry**

SHOW WORK A cylinder containing 48g of nitrogen gas at room temperature is placed on a scale. The valve is opened and 12g of gas are allowed to escape. Assuming that the temperature of the cylinder remains constant, how does the pressure change?
*December 4, 2013*

**chemistry**

SHOW WORK How many moles of helium occupy 26.4 L at a pressure of 103.0 kPa, and 10 degrees Celsius? A.) 0.03 mole B.) 0.86 mole C.) 1.16 mole D.) 32.72 mole
*December 4, 2013*

**Physics**

A freestyle skier hits the take off ramp with an initial velocity of 17.5 m/s with a purely vertical take off (90 degrees). What is the peak height that the skier will reach? Can you fully explain to me how to get this answer? I did the formula d=Vi*deltT+(1/2)(a)(t^2). To get...
*February 27, 2013*

**Algebra**

-x+5y=13 x-y=15 Solve by using process of elimination.
*January 17, 2013*

**math**

8n^2+14n-15=0
*January 16, 2013*

**math**

3 written ratios for 4 apples for $1
*January 3, 2013*

**Choir**

Thank you, this will help me during the concert!
*November 5, 2012*

**Choir**

How high should my note be in the highest point of the song O Come all ye faithful.
*November 5, 2012*

**reading**

What type of figurative language is this sentence:He was as clumsy as a bull in a China shop.
*November 5, 2012*

**Algebra 1 **

What is an equivalent fraction to: 1/4(20z+10)+1/2z-2 1/4. I don't understand this.
*October 30, 2012*

**Algebra 1**

What is an equivalent fraction to: 0.5(12z-7)-3.5z+3.5 I NEED HELP!!!
*October 30, 2012*

**elementary**

That chocolate is from me. Why can't YOU do this?
*October 30, 2012*

**Chemistry**

Calculate the concentration of an acetic acid solution prepared by mixing 13.5mL of 10.0M acetic acid with 250.0mL of .15M NaCl solution.
*October 10, 2012*

**Physics**

The diagram for this problem is a pulley. On the left end Box 1 is sitting on a table and Box 2 is attached sitting on top of Box 1 and is attached to the string for the pulley. The right side has the string attached to Box 3 which is lifted off the table. A massless rope ...
*June 21, 2012*

**Physics**

Yea I got it! Thanks a lot!
*June 20, 2012*

**Physics**

Oh sorry I completely forgot to add that part in. It's a right triangle and mass A is on the incline (hypotenuse) portion and is attached to a pulley and on the other end is mass B hanging down the side that would be the height of the triangle (opposite of the angle). Is ...
*June 20, 2012*

**Physics**

If someone could help me get started or help me with the first few steps I could probably finish. With Mass A = .500 kg And Mass B = .125 kg Find the angle so that the system will be in equilibrium.
*June 20, 2012*

**7th grade history**

who was the frist dutch priest in eurpoe
*April 11, 2012*

**CALCULUS**

Find d/dx of the antiderivative from x^4 to 5 of the (9-t^2)^1/2
*March 8, 2012*

**calculus**

A trough is 10 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x10 from x=−1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty the trough by pumping the ...
*February 27, 2012*

**Calculus**

A trough is 5 meters long, 1 meters wide, and 4 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 4 meters, and base, on top, of length 1 meters). The trough is full of water (density 1000 kg/m3 ). Find ...
*February 27, 2012*

**Calculus**

A trough is 5 meters long, 1 meters wide, and 4 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 4 meters, and base, on top, of length 1 meters). The trough is full of water (density 1000 kg/m3 ). Find ...
*February 27, 2012*

**hss**

need help to do a project on louise pasture
*January 30, 2012*

**Math**

I need a formula to solve the question.... If anyone has a clue I would love it
*November 27, 2011*

**Math**

Karen has an 86% average after 4 grades, what grade does she need to get in order to bringer average up to an 88%?
*November 27, 2011*

**Physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.6 m waterfall. The spy’s speed is 15 m/s and the officials’ speed is ...
*November 21, 2011*

**calculus**

find the equation of the tangent line at f(x)=tanx - 2 at point (pie/8,3)
*October 18, 2011*

**chemistry**

A cube of gold has a side length .050m. The mass of the cube is 2.40kg. What is the density of gold in g/cm cubed?
*October 13, 2011*

**math**

You are 64 inches tall and your shadow is 72 inches long. A tree casts a shadow of 144 inches. How tall is the tree?
*June 29, 2011*

**maths**

1 1/6!!
*June 29, 2011*

**pre-calc**

what are the asymtopes of 2x/x-3
*May 22, 2011*

**trig identities**

is that the answer?
*April 26, 2011*

**trig identities**

cos94 degrees cos18 degrees+ sin94 degrees sin18 degrees. write the expression as the sine, cosine, or tangent of an angle.
*April 26, 2011*

**pre calc**

cos2x=cosx in interval of [0,2pie]
*April 26, 2011*

**Algebra **

Ok thanks!
*April 5, 2011*

**Algebra **

Is this simplified? 6a2 + 4a2b - 4ab - 3b *The 2's are exponents
*April 5, 2011*

**english 3**

Which one of the following statements is not true about the president Ratcliffe portrayed in The General History?
*February 9, 2011*

**social studies**

i need a list og lanformations in weirton wv or near weirton wv
*January 23, 2011*

**Algebra**

Each ordered pair is a solution of a direct variation. Write the equation of direct variation. (2,10) (8,2) (7,21) (2,-16) Please Help!
*December 2, 2010*

**Math**

1st- 110 2nd- 55 3rd- 110 4th- 55 5th- 60 Pretty sure that's correct
*December 2, 2010*

**Math Help please!!**

5-26= -21 Negative fractions and whole numbers. If the second number is greater than the first, subtract the first from the second and add a negative sign.
*December 2, 2010*

**Math**

Well then . . . You are subtracting fractions from whole numbers. You take your whole number and put it over 1. Then Find a commom denomenator between the two bottom numbers. For example, 5-2/6. 5/1-2/6. The common denomenator is 6. So inorder to get from 1 to 6, you have to ...
*December 2, 2010*

**Math**

5-26= -21 Negative fractions and whole numbers. If the second number is greater than the first, subtract the first from the second and add a negative sign.
*December 2, 2010*

**Chemistry**

They already have their maximum number of valence electrons in the outer shells, so they are stable without having to react to gaining or losing electrons
*November 17, 2010*

**Chemistry**

Why are the alkali and alkaline earth metals more reactive than other elements on the periodic table?
*November 17, 2010*

**pre calculus**

f(x)= a+tan(bx) fina a and b f(0)= 5 f(pi/8)=1/sq root of 3 +5
*November 14, 2010*

**Science (Chemisty)**

Scientists in 1962 became very excited when they were able to create xenon tetrafluoride. Why was this an unusual feat? Why was fluorine a good choice to try to react with xenon?
*October 25, 2010*

**Science (Chemisty)**

The melting point of sodium is 97.8`C. Would you expect the melting point of iodine to be higher or lower?
*October 25, 2010*

**Science**

Yeah a little?? Thanks!
*October 25, 2010*

**Science**

Magnesium burns quickly in flashbulbs when an electric current passes through it, providing a bright light for exposing film. Why do you suppose the inside of the bulb containing the magnesium is filled with a "noble" gas instead of air??
*October 25, 2010*

**Science (Chemistry Periodic Table of Elements)**

A tube of "Brilliant Yellow" acrylic paint contains titanium dioxide. What transition metal is in this compound? What important nonmetal elements is in this compound?
*October 25, 2010*

**physics**

When a horizontal force of 4.5 newtons acts on a block on a resistance-free surface, it produces an acceleration of 2.5 m/s squared. Suppose a second 4.0 kg block is dropped onto the first. What is the magnitude of the acceleration of the combination if the same force ...
*October 25, 2010*

**algebra**

Will and frank can do a certain job together in 60 minutes. Will can do 3x as much of the job as frank can. in any given amount of time how many minutes would it take will to do the job alone..??
*October 18, 2010*

**8th grade math**

1- (4+2)/3-1 2- (4+1)-3*1 3- (4+2)-3*1 4- (4+3)-1-2 5- (4+3)-2*1 6- (4*3)/2*1 7- (4/2)*3+1 8- (2+3)+4-1 9- (2+3)+4*1 10-(4*3)-2*1 11-(4*2)+3*1 12- (4+2)+3+1 13- (4*3)+2-1 14- (4*3)+2*1\ 15- (4*3)+2+1 16- (4+3)+1*2 17- (4+1)*3+2 18- (4+2)*1*3 19- (4+2)*3+1 20- (NO ANSWER) 21- (...
*September 20, 2010*

**algebra 2**

3t(t+2)-(3t+5t) for t=19 3t(t+2)-(8t) 3(19)*(19+2)-(8*19) 57*21-152 1197-152=1045
*September 20, 2010*

**chemistry**

A gas has a density of 5.56 g/l. What volume in mL would a 4.17 g of this gas occupy?
*September 9, 2010*

**Global Studies**

By Asian, I mean east Asian (Chinese, Mongolian, Nepalese, etc.) The hat wasn't quite like that; it was a bit larger, so that it went almost to his ears.
*September 1, 2010*

**Global Studies**

For my project, I had to stand in a public place for an hour and then reflect upon the diversity that I saw in my community. One person I saw was of Asian background, and clad in loose, beige trousers, and a matching shirt which was also loose-fitting. He wore flat sandals (...
*September 1, 2010*

**algebra**

Bob and his dad visited the hardware store on Saturday. They observed the following transactions:Mr Harris bought 4 for $0.50, Mrs Clarke bought 21 for $1.00, Mr Montaro bought 1,124 for $2.00 and Ms Park bought 450 for $1.50. What were they buying?
*August 30, 2010*

**Math**

The half-life of strontium-90 is 28 years. How long will it take a 60 mg sample to decay to a mass of 15 mg?
*May 19, 2010*

**Math**

What is 54.9*10 to the 6th power in scientific notaion
*May 4, 2010*

**Physical Science**

An object travels 6m in the first second of travel, 6m again durning the second second of travel, and 6m again druning the third second. It acceleration in meters per second per second(M/S2) is
*October 25, 2009*

**7th grade- Social Studies**

i need help with a question
*October 13, 2009*

**math...number sequence**

1 2 3 4 5 6 _______________________________________4 15 32 55 84 119 find the 20th term for to this table.
*June 29, 2009*

**algebra 1 page 167 did you hear about...**

I'm doing the same page now and I got the exact same thing!!!!!
*February 22, 2009*

**equation 6th grade**

30x=248
*November 19, 2008*

**Science**

Grass, Birch, Balsam Fir, Fox, Wolve, Moose, Snowshoe hare, Ticks, Mosquitos .. what are the producers, primary consumers, seconday consumers and the tertiary consumers?
*October 26, 2008*

**science**

what is a theory?
*September 11, 2007*

**celebraties**

How old is Linsey Lohan I typed Lindsay Lohan biography into the Google.com search box. This is the first site and has her birthdate on the first screen. http://www.netglimse.com/celebs/pages/lindsay_lohan/
*July 16, 2007*

**art**

I have to make a magazine for school and it said a tagline.What is a tagline?????? Here is a terrific explanation, along with wonderful examples of taglines: http://en.wikipedia.org/wiki/Tagline ok but i cant understand that tell me in easier words If the tagline is for your ...
*July 15, 2007*

**math**

If a man drove 3.5 miles to a gas station and on the way home drove 2 times that +.7 miles,how many miles did he drive?? 3.5 + 2 times 3.5 + .7 = what Do the math. 17.5 omg ur so smart...
*June 7, 2007*

**math**

What does it mean by one set of numbers being a subset of the other? If 3, 4,5,6 is a set of numbers, then 4,5 is a subset.
*May 1, 2007*

**PLEASE READ LANCE**

imean you know how sedanetery and metamorphic rocks care i mean how many rocks like coal and limestone are there
*April 7, 2007*

**speeches**

What should i do right after i mess up on a speech???/? Thank you for using the Jiskha Homework Help Forum. If you have a problem during a speech, just continue. Without an example of what you mean, it is extremely difficult to advise you. If the speech is over and you feel ...
*April 7, 2007*

**science**

about how many diffrent rocks are there Directly from the site I gave you: "The three classes of rocks: the igneous, the sedimentary and the metamorphic — are subdivided into many groups. There are, however, no hard and fast boundaries between allied rocks. By ...
*April 7, 2007*

**PLEASE HELP SOLVE RIDDLE**

Two men occupy different cells in a local jail. When the sheriff comes to take them to court, he notices that they bear a strong resemblance to each other. He approaches the older of the two men and asks him if he and the other fellow are related. He is given this answer: &...
*March 23, 2007*

**math**

what is.7 of 39.4????? 39.4*.7=27.58 Having trouble solving equations with two variables..both unknown
*March 20, 2007*

**Soical Studies**

Name all the south-East states Thank you for using the Jiskha Homework Help Forum. Look in any Atlas of the U.S. and you will find the southeast states: 1. http://geology.er.usgs.gov/states/southeast.html 2. (Broken Link Removed) 3. http://www.studystack.com/studytable-12568 (...
*March 20, 2007*

**Science**

What is coal & how does it form? http://www.athro.com/geo/trp/gub/coal.html
*March 20, 2007*

**Social Studies**

Easiest way to build a model of an Iroquois village using natural materials? I suggest you use balsa wood for the longhouses. Perhaps twigs could be the trees -- and, of course, you can use real dirt the the ground. This site has pictures and descriptions of an Iroquois ...
*October 25, 2006*

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