Saturday

December 20, 2014

December 20, 2014

Total # Posts: 680

**Chemistry**

Many metals react with oxygen gas to form the metal oxide. For example calcium reacts: 2Ca(s) + O2(g)--> 2CaO(s) Calculate the mass of calcium prepared from 4,20g of Ca and 2.80g of O2. (a) How many moles of CaO can form from the given mass of Ca? (b) How many moles of CaO ...
*September 28, 2009*

**history**

Which came first? A. Formation of the french revolution war b.execution of king louis xvi c. American bill of rights d.seven years war e. World war 1
*September 9, 2009*

**maths**

Number two should look like this: (-7x+x^2)(-x)+x^2 Also, I gave it another try and this is what I got (only for number 1 and 2): 1. y-6y^2 2. 8x^2+(-x^3) Please check and help out with #3 and #4.. :)
*September 8, 2009*

**maths**

Simplify the expression. 1. 3y-(6y+2)(-y) 2. (-7x+^2)(-x)+x^2 3. 3y/2 divide by 2/7 4. -x/4 divide by 6/x I couldn't do any of these. Please explain.. Thanks!
*September 8, 2009*

**maths**

3. -4x-x^2 4. -4t^2+(-8t) please check those again. and when you say redo number 1, which one do you mean: a. 2|3x-5| when x=(-3) or b. (-4)(-x)(x^2) thanks!! :)
*September 8, 2009*

**maths**

1. Q: 2|3x-5| when x=(-3) A: 24 2. Q: |6-x|+4 when x=5 A: 5 _______________ Simplify the expression. 1. (-4)(-x)(x^2) my answer: 4x^3 2. (24)(-5x)(-x) my answer: 120x^2 3. -x(4-x) my answer: -4x-x 4. -4t(t+2) my answer: -4t^2+(-6t) 5. b^2(4-b^2) my answer: 4b^2-b^4 6. (c+3c^2...
*September 8, 2009*

**algebra I**

I checked, the calculation was wrong. It's $1441.29 Thanks a lot :)!
*September 8, 2009*

**geo check**

a fine rich soil that is carried by the wind is known as: A)bauxite B)loess C)polder D)mistral
*August 24, 2009*

**7thscience**

i need 4 possible outcomes when new info is found about scientific explanation &3 parts of a system?
*August 17, 2009*

**7th science**

what r 4 possible outcomes when new info is found about a scientific explanation?
*August 17, 2009*

**7th grade**

what is the difference between physical science &scientific theory?
*August 17, 2009*

**science**

why do power plugs have 3 sockets even though many appliances have plugs with only 2 pins
*August 3, 2009*

**Project Management**

you are to prepare a network diagram using the Activity on the Arrow technique. You must use as many concurrent activities as you can and you must show the critical path. (A network diagram with no concurrent activities will result in no grade points being earned.) You will be...
*June 19, 2009*

**Project Management**

Offices: Boston, Chicago, Memphis, Charlotte, Atlanta, and Orlando Location of Event: Miami Travel Days: To Miami on Sunday, Returning from Miami on Saturday. Travel Means: Air or Private Auto, whichever is convenient and reasonable. Autos must be shared. Lodging: All ...
*June 16, 2009*

**Project Management**

Crew Size: 2 Components, timing and sequencing - all times are in weeks: Components Time to Deliver Assembly Time Assembly Sequence Canopy 2 1 To fuselage after instruments Spinner 1 1 To engine after propeller Rudder 3 1 To fuselage after stabilizer Undercarriage 5 1 To ...
*June 16, 2009*

**critical thinking**

what is an example of ad mhominem/genetic It takes someone with a really big heart to give to our charity, and you seem like someone who cares the most
*June 11, 2009*

**english**

What is the schwa sound in paper?
*April 27, 2009*

**Math**

At a sale Jean recieved a discount of $10.00 on a coat marked $80.00. What was the rate of the discount?
*April 21, 2009*

**social studies**

Thanks that helped me A LOT!!!! :) Thanks again ~ Courtney
*April 21, 2009*

**social studies**

What is the key aspiration people in Pennsylvania???? I am reseaching Pennsylvania for extra credit....
*April 21, 2009*

**4th grade**

i used the equation: 1/2x+1/4x+3=x then add 1/2x and 1/4x: 3/4x+3=x then subtract 3/4x on both sides:3=1/4x then divide by 1/4x: 12=x -12 coins is the answer :)
*April 8, 2009*

**4th grade**

Bobby has 12 coins. he has 3 dimes, 6 pennies, and 3 quarters
*April 8, 2009*

**science-8th**

thanks....but ive tried that. this is for my friend but its okay we'll figure it out sooner of later! Thank you very much
*April 8, 2009*

**Health**

what role do health care worker play in determing quality care
*April 4, 2009*

**physics**

First you have to calculate the time it takes for the block to hit the ground. y(t)=vit+(1/2)gt^2 y(t)=1+(1/2)(-9.80)t^2 Solve for t: t=0.45s With distance and time you can calculate velocity: d/t= 2.00/0.45= 4.44m/s Use this velocity in calculating the initial velocity of the...
*March 24, 2009*

**Literature / Short story I**

1.C 2.C 3.A 4.C 5.A 6.D 7.D 8.C 9.A 10.C 11.B 12.B 13.C 14.D 15.B 16.B 17.D 18.D 19.A 20.B JUST TOOK THE TEST MADE A 100
*March 13, 2009*

**History**

What is the cultural affect of trade and warfare?
*March 3, 2009*

**english**

I used a quote in my essay for school. I have to do a work cited page. What information do I need to cite it properly. I did a bunch of google searches put they really didn't help.
*February 18, 2009*

**english**

True meaning lyes behind this quote because.. is the world lyes spelled right?
*February 18, 2009*

**Trig**

tan(to the second power) s sin(to second power)=tan(to second power + cos(second power) s - 1...I need the steps on how to get it to equal...problem looks like tan2 s sin2 s=tan2 s + cos2 s - 1...thanks if you can figure it out
*February 17, 2009*

**english**

Thank You very helpful the both of you!! Good work
*February 16, 2009*

**english**

Can you start a sentence off with the word because?
*February 16, 2009*

**7th grade science**

i need pictures of cardiac,smooth and skeletal muscles
*February 1, 2009*

**7th grade**

What is a word that starts with the letter U?
*January 26, 2009*

**music**

Where did Hector Berlioz study music?
*December 17, 2008*

**12th grade chemistry!!**

huh??
*December 7, 2008*

**12th grade chemistry!!**

Where on the periodic table would you find elements that ionize to form cations and anions?????
*December 7, 2008*

**psychology**

The longest period of time during prenatal development is the -Period of the fetus - Third Trimester - Period of the embryo - Germinal Stage - Period of the zygote I believe the answer is period of the fetus.
*November 24, 2008*

**psychology**

How many phonemes are in the word football? -two -eight -five -six -four I think the answer is four but everyone that I talk to has a different answer. It's driving me crazy no one knows who's right!!
*November 24, 2008*

**novel**

After the death of Curly in The Call of the Wild, Buck concludes that no fair play exists in his world and that he will never go down in a fight. The theme illustrated here is apparently derived from London's interpretation of
*November 18, 2008*

**the short story, part 2**

After the death of Curly in The Call of the Wild, Buck concludes that no fair play exists in his world and that he will never go down in a fight. The theme illustrated here is apparently derived from London's interpretation of
*November 13, 2008*

**the short story, part 2**

In "Young Goodman Brown," the allegorical meaning of Faith's pink ribbons is
*November 13, 2008*

**predicates and subjects**

hi
*November 12, 2008*

**math**

Calculus Question: Find the derivative of this function: g(x)=ln(ln(x+1))+e^(x^(3/2)+(x/3)) Teacher didn't show how to do a problem like this and my book doesn't show anything like it either. Any help with this will be greatly appreciated.
*November 7, 2008*

**English**

I need to think of some expressions or idioms involving Mexico, along the lines of "spice it up" "south of the border" or anything else anyone can think of. Gracias!!
*October 29, 2008*

**english**

I need to think of some expressions or idioms involving Mexico, along the lines of "spice it up" "south of the border" or anything else anyone can think of. Gracias!!
*October 29, 2008*

**Collge Algebra**

i do know that it is the b + or - the square root of b squared -4ac over 2a but I still can't get the correct answer
*October 21, 2008*

**Collge Algebra**

The 8-2x under the square root -x =0 someone help
*October 21, 2008*

**College Algebra**

4x^2=8x-5 Please someone help
*October 21, 2008*

**math**

4x^2=8x-5
*October 21, 2008*

**social studies**

i think it was Tacitus. The historian Tacitus was born in the year 56 or 57 probably in Rome. He was in Rome during the great fire. During his lifetime he wrote a number of histories chronicling the reigns of the early emperors.
*October 17, 2008*

**Math**

here's what i get F+S+C=91 S=14+F C=6+F SO... F+(14+F)+(6+F)=91 3F+20=91 3F=71 F=23.667YEARS
*October 16, 2008*

**math**

i get 7.2X10^21 cups.
*October 16, 2008*

**math**

i posted this one a ways down, i apologize for double posting, but thought this might be a better way to ask. question:if you write the numbers from 1-999 on a piece of paper, (1234567891011121314151617181920...998999) what will the 2006th digit from the left be? so my thought...
*October 16, 2008*

**Biology 2**

1st, i am not an expert in physics by any means. just a dad. but here is what i found on a google search. 1 calorie is defined as the amount of energy needed to raise the temperature of 1 gram of water by 1C, so... It takes 50 calories to raise your 50 grams by 1C, but you ...
*October 16, 2008*

**Math - algebra**

Hi, i'm not a math expert, just another dad trying to help my kid. i found this and thought it might help. oops, guess i can't paste a website address here. if you google quadratic equation calculator it should come up i think using the quadratic equation here might ...
*October 16, 2008*

**probability**

thank you again for all the help
*October 16, 2008*

**probability**

Mr. Pursley, thank you for taking the time to answer my question. i very much appreciate the help. just to clarify, then the answer would be (.3636*.3)+(.6363*.6)=0.49 is this right?
*October 16, 2008*

**probability**

i'm sorry, i don't understand this response. does it mean the first answer 3/11 is incorrect?
*October 16, 2008*

**probability**

7 white socks anf four black socks are in a bag. if two socks are drawn at random, what is the probability that both socks are the same color? thank you so much for the help
*October 16, 2008*

**math**

here's my question. if you write the numbers from 1-999 on a piece of paper, (1234567891011121314151617181920...998999) what will the 2006th digit from the left be?
*October 16, 2008*

**grammar**

identify simple complete and compound subject and predicate
*October 14, 2008*

**social studies**

describe why delegates did not choose either plan for electing the president of the united states
*October 4, 2008*

**History**

Thanks. =)
*September 7, 2008*

**History**

I had to read a couple of creation myth stories for my history class, and now I have to write an essay on them. I understand mostly why they are important, but I'm failing to understand the role that nature plays in them. Can someone please tell me what that role is, or ...
*September 7, 2008*

**8th grade**

if 20 of 100 squares on a grid are shades blue, what percent of the squares are blue
*August 25, 2008*

**Biology**

most polar molecules and ions cannot enter cells. why? many food particles are polar how do they get into the cell?
*August 4, 2008*

**BIOLOGY**

which following of the aspects of the cell cycle would be most disrupted by cytochalasin B SPINDLE FORMATION CLEVAGE FURROW CELL ELONGATION DNA SYNTHESIS SPINDLE ATTACHMENT
*August 3, 2008*

**biology**

G1 is represented by which numbers I AND V II AND IV III IV V
*August 3, 2008*

**biology**

a particular cell has half as much dna as some of the other cells in a mitotically active tissue. the in the question is most likely in anaphase G1 prophase metaphase G2
*August 3, 2008*

**biology**

in which group of eukaryotic organisms does the nuclear envelope remain intact during mitosis
*August 3, 2008*

**Alegebra 2**

Factor x^3+2x^2-36x-72
*May 19, 2008*

**government**

Why did the South choose to return to a Confederacy despite the failures of this governmental form in the late 18th Century?
*May 14, 2008*

**Physics**

170 students in a lecture hall can scream at 115 dB. Thus, we should expect that: A. an average student can do 0.68 dB by him or herself. B.340 average students can do 125 dB. C.340 average students can do 230 dB. D.1700 average students can do 125 dB. E.85 average students ...
*May 8, 2008*

**English**

1. C Correct 2. B Correct 3. D C STUDY GUID 98-100 4. A Correct 5. C Correct 6. C Correct 7. D Correct 8. C Correct 9. C Correct 10. D Correct 11. A Correct 12. C B STUDY GUID 94-96 13. D Correct 14. D Correct 15. B Correct 16. A Correct 17. B Correct 18. A Correct 19. C B ...
*April 18, 2008*

**Science**

What first appeared in the Carboniferous Period i cant find it anywhere
*April 17, 2008*

**Trig**

Simplify: csc A - sin A - Cot A Cot A Csc A 1/sin - sin A - 1/tan 1/tan 1/sin -sinA?
*April 16, 2008*

**Physics**

A skier starts at rest on the top of Mt Circular, a strange, smooth, icy hill shaped like a hemisphere. The hill has a constant radius of R. Neglecting friction (it is icy!), show that the skier will leave the surface of the hill and become air-borne at a vertical distance of ...
*April 14, 2008*

**math**

what is 30000+6004=
*March 25, 2008*

**Physics**

A small electric immersion heater is used to boil 191.0 g of water for a cup of instant coffee. The heater is labeled 355.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 12.0°C to the boiling ...
*March 21, 2008*

**Physics**

Nevermind I got it =]
*March 20, 2008*

**Physics**

Which of the following is an example of something not allowed by the second law of thermodynamics? Indicate true or false. 1.All refrigerators can be made perfect 2.A spoon in a hot drink spontaneously stirring the drink 3.All the molecules suddenly moving to one place in a ...
*March 20, 2008*

**Interpersonal Communication in Criminal Justice**

just to let you know the escobedo v. illinios case "The Supreme Court overturned Escobedo's conviction and recognized a suspect's right to an attorney during police interrogation." and it wasnt so much about the marianda rights it was more about the due ...
*March 13, 2008*

**Physical Science**

The nucleus of an atom contains six neutrons and esix protons. The nucleus of a second atom contains six neutrons and five protons. Are they atoms of different elements or isotopes of the same element?
*March 11, 2008*

**physics**

A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting 2.3 m/s what am i doing wrong?
*March 7, 2008*

**pre-calculus**

find the cube roots of -216 answer in polar form and complex
*March 6, 2008*

**Physics**

A moving 4.80 kg block collides with a horizontal spring whose spring constant is 243 N/m. The block compresses the spring a maximum distance of 5.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.390. What is ...
*March 5, 2008*

**physics**

oh sorry its If the crate starts from rest, how fast will it be moving after the man has pulled it a distance of 2.70 m?
*March 2, 2008*

**physics**

A man pulls a crate of mass 53.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 28.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate starts from rest, ...
*March 2, 2008*

**Physics**

actually it's 1 false 2 true 3 false 4 false 5 true 6 true
*February 28, 2008*

**Physics**

there's three parts, i keep getting these wrong please help. A set of crash tests consists of running a test car moving at a speed of 11.8 m/s (26.4 mi/hr) into a solid wall. Strapped securely in an advanced seat belt system, a 59.0 kg (130 lbs) dummy is found to move a ...
*February 28, 2008*

**Acids and alkalis**

I Need To No Atleast 3 Uses Of Acids And Alkalis!!!! Can You Please Help!!!
*February 24, 2008*

**Calculus**

is that how you prove it?
*February 21, 2008*

**Calculus**

prove: if z is a complex number and 1/z=the conjugate of z over the absolute value of z squared.
*February 21, 2008*

**Calculus**

prove: if z is a complex number and 1/z=the conjugate of z over the absolute value of z squared.
*February 21, 2008*

**Calculus**

prove: if z is a complex number 1/2= the conjugate of z of the absolute value of z squared.
*February 21, 2008*

**physics**

A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a block (M = 2.30 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. and Find the angle (in degrees) through which the block rises, if the strings are 0....
*February 21, 2008*

**calculus**

thanks
*February 20, 2008*

**calculus**

im sorry they were two different questions you have to find the modulus and the argument ex.15-4i modulus-4 but i dont know what the argument is
*February 20, 2008*

**calculus**

find the modulus and the argument of the following complex numbers: 15-4i and a-ai where a is greater than 0
*February 20, 2008*

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