Saturday
December 20, 2014

Posts by courtney


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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