Tuesday
August 4, 2015

Posts by Matthew


Total # Posts: 612

Mathematics
A solution is mixed with a 12% acid solution to form a 16% acid solution. How many liters of the 20% acid solution are used to make 10 liters of the 16% acid solution?
February 24, 2010

physics
The current of a river is 1.9 m/s. A person can swim 0.7 m/s. What is the best angle for the swimmer so that it is swept downstream the shortest distance possible? Distance of river is 120 m.
February 22, 2010

AP Chemistry
A 500 g piece of metal at 60 degrees celsius is placed in 200g of water at 22 degrees celsius contained in a coffee cup calorimeter. The metal and water come to the same temperature at 32.5 degrees cesius. The specific heat of the water is 4.184 j/g(degrees celsius) a) how ...
February 15, 2010

AP Chemistry
i still keep messing up, can someone give me a specific answer i can use as a base?
February 15, 2010

Math
Thank you
February 3, 2010

Math
Two small planes start from the same point and fly in the opposite directions. The first plane is flying 35 mph slower than the second plane. In 2 hrs, the planes are 530 mi apart. Find the rate of the slow plane.
February 3, 2010

SOCIAL STUDIES
THIS IS ABOUT EXPLORERS. WHAT IS A JOURNEY MADE FOR A SPECIAL REASON?
January 28, 2010

Math
The price of an international call from Detroit to Paris, France, using a particular phone company is 75 cents for the first 5 minutes and 10 cents for each additional minute or fraction thereof. What is the cost (in dollars) of a 25 minute call from Detroit to Paris?
January 23, 2010

physics
Jennifer (mass 58.0 kg) is standing at the left end of a 13.0 m long 594.0 kg cart that has frictionless wheels and rolls on a frictionless track. Initially both Jennifer and the cart are at rest. Suddenly, Jennifer starts running along the cart at a speed of 5.70 m/s relative...
January 22, 2010

Language Arts
Is the following a correct sentence: Martha and him ate the sandwich.
January 14, 2010

math
what is 6 3/4 - 7 2/8
January 13, 2010

social studies
compare trading in China, America, Egypt and Greek then and now.
December 10, 2009

social studies
what is the history of trading then and now
December 10, 2009

Physics
A spring has a spring constant of 259N/m. Find the magnitude of the force needed (a) to stretch the spring by 3.54 10-2m from its unstrained length and N (b) to compress the spring by the same amount. N
November 17, 2009

5th grade Language
Read the poem and answer the question 1. There once was a owboy named Ray 2 who never had that much to say 3 except or the times 4. Stampedes topped on a dime 5 when that cowboy named Ray hollered "hey" 1 in which lines do you see repetition? 2 what is the example of...
November 5, 2009

4 grade
do you have a anwser to this question ,68, ,94, ,120 and the rule
October 22, 2009

Physics
I think the 2a is meant to be 2 * a
October 18, 2009

Physics
When you lift a ball with a force of 82N, the ball accelerates upward with an acceleration of a. If you lift with a force of 92N, the balls acceleration is 2a. Find the weight of the ball, and the acceleration a. I tried solving this via substitution algebra, but the answer ...
October 18, 2009

4th Grade Math
Do you have any answers for this question ,68, ,94, ,120, and the rule
October 12, 2009

Social Studies
What idea did the United States Constitution borrow from the Iroquois League?
October 12, 2009

Physics
My thoughts were that tension must be halved in one sense or another, but I cant seem to get the math to work out involved, perhaps Im missing the equations entirely.
October 8, 2009

Physics
This is another problem that I need clarification on since no one seems to be of any help at my school, A pulley system is used to lift a 52- crate.Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume ...
October 8, 2009

Physics
C ( ) | O | | | | | | | | | | O ) (Force via hand) | [52kg] Sorry for such a crude drawing but if you imagine the lines as the rope, the parentheses as curves in the line, and O's as the pulleys. C = Cieling
October 7, 2009

Physics
This is another problem that I need clarification on since no one seems to be of any help at my school, A pulley system is used to lift a 52- crate.Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume ...
October 7, 2009

math
The solution seems to follow this pattern. 2 x 5 = 10 10 -5 = 5 5 x 5 = 25 25- 5 = 20 20 x 5= 100 Basically first number times 5, next minus 5, the next again times 5, the one after minus 5 Etc.
October 7, 2009

Physics
\ 130o / \ / \ / \ / \O/ /|\ C mg C 1 2 C= contact force #1 and #2. Does this fit your logic?
October 7, 2009

Physics
Please help me out, I can't figure out the process for answering this question and my TA is of no help, A 0.11- ball is placed in a shallow wedge with an opening angle of 130 degrees,for each contact point between the wedge and the ball, determine the force exerted on the ...
October 7, 2009

history
What is socialism?
October 3, 2009

Bio
Flowering is not a category in which land plants are classified.
September 22, 2009

mathematic
if f(x)=cos(5x) find f(pie/4)
July 19, 2009

math
if f(x)=cos(5x) find f(ð/4)
July 18, 2009

math
thank you soo much for all ur help
July 18, 2009

math
thank you very much for all ur help
July 18, 2009

math
if f(x)=3tan(x)+2 and, find f(ð/3)
July 18, 2009

mathematics
sinÈ= 1/4 and ð/4<È<ð, find the value of cosÈ
July 18, 2009

mathematics
for all values of X for which of the following is defined, find th value of cot^2(X)- csc^2(X)
July 18, 2009

Physics
wwhat is the kinetic energy of a 1500kg car with a velocity of 72km/r B.... how much work must be done on ths car to bring it to a complete stop
June 20, 2009

math
how do u factor 7x^3+28x^2-35x ? thanx.
June 6, 2009

5th grade math
Round 427,685 to the nearest thousand. A. 400,000 C. 428,000 B. 427,000 D. 430,000 the answer is C Round 0.8394263 to the nearest hundred-thousandth. A. 0.840 C. 0.83942 B. 0.83943 D. 0.839 would the answer be B?
May 14, 2009

English
Could someone help me write a thesis statement for the following topic: "Our school should be free of all weapons including the guns carried by a police officer." So far this is what i have for a thesis statment. "Although having police officers in our schools ...
May 7, 2009

English
It still needs some tweaking. I feel that it's too specific. What do you think?
May 6, 2009

English
Hi, thanks your website was helpful. I don't think armed police officers should be in our schools. This is what i have so far: "Although having police officers in our schools has proven a success rate in the decrease of violence and bullying, armed police is not a ...
May 6, 2009

English
Hi, I am doing an essay on the topic "Our school should be free of all weapons - including the guns carried by a police officer.I am having difficulty coming up with a thesis statement, could you help me. Thanks.
May 6, 2009

6th Grade Math
28%
March 30, 2009

5th grade
what is m+4=1
March 24, 2009

chemistry
In order from highest to lowest. heptane, 2,2-dimethylpentane, hexane, and butane .
January 24, 2009

Chemistry
A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you overcome this problem???
January 24, 2009

Economics
Hi there, I am having trouble with this problem.Can you give me some guidance. In planning the publication of a new engineering economics textbook, the publisher has identified the following fixed and variable costs. Fixed Costs Overhead- $10,000 Editing and Typesetting- $100,...
January 21, 2009

college
I need help with drug treatments for the respiratory system
January 13, 2009

Geography
what is the biggest holiday for followers of Shinto?
January 8, 2009

Math
Can someone help me solve this please A*.3=B A-B=150,000
December 17, 2008

science
Folic acid, iron and calcium
December 17, 2008

project management
for example increase profits or increase employee moral.. these are just examples.
November 24, 2008

project management
Using the MBO approach (management by objectives)come up with a strategy.(make it up) Break them into the 4 levels level 1 top level 2 division level 3 department level 3 employ
November 24, 2008

project management
You find a problem in a project. The project has a defined baseline and task progress has been entered for all tasks for the first report period. The ACWP field show the right cost for the work reported, but the BCWP and BCWS fields are zero. what could be the problem?
November 16, 2008

Communications
thank you for the articles. I'm focusing on external communications in north america. Does the txt messaging article also refer to North america?
November 9, 2008

Communications
Hi there, I am doing a project on Cadbury Chocolate and how to uses (external communication) could you give me ideas of what i should talk about? Or any useful websites or videos? Thanks.
November 9, 2008

Algebra
On a bull.
November 9, 2008

Math check
To complete the square, you divide the number before the x by 2, square it, and add it to the end. The answer is d.
November 9, 2008

Math help
Yes.
November 9, 2008

pre-algebra
-8a+6(a+7)=1 -8a+6a+42=1 -2a=-41 a=20.5
November 9, 2008

algebra2
-3x+y=-2 -2=7x-y
October 26, 2008

mth
34%
October 20, 2008

Math
Mike took a 2"x4" picture to the photo store. He had it made into a 4"x8" print. Which geometric concept best describes the relationship between the two prints? Similarity, Linear, Symmetry or Congruency?
October 20, 2008

math-3rd grade
Explain your thinking. Use the digits 1, 3, 4, 5, 7, and 9 to write two money amounts that you can subtract by trading 1 dollar for 10 dimes. Then solve.
October 15, 2008

science
what are the physcial changes of ethylene glycol at 197 degrees
October 6, 2008

math
[-50/2+3] (20-9)
October 6, 2008

Chemistry
Greetings: I was wondering how to calculate the weight/volume % of vinegar using the formula ---------------w/v Per Cent = g/100 mL or grams per deciliter: WHAT WEIGHT DO I USE NaOH, Acetic ACID? the data include: volume of NaOH needed to neutralize Vingegar : 14.24 mL Volume ...
October 1, 2008

Math
how can i help my son matthew about division and subtract borrow . thanks
September 9, 2008

Math
9 in the thousands and 2 in the ones
August 26, 2008

unscramble
tselaacdns
May 8, 2008

science
Why is plastic an expensive material to use?
May 6, 2008

Physics
Nope.
April 30, 2008

math
Which is an equation of the line with slope 2 and y-intercept 6? A). y=2x-6 B). y=6x+2 C). 2x+6y=1 D). y+2x+6. thanks if you can help
April 16, 2008

Social Studies
I am presently creating a unit about land transportation in the community and how these transportations affect our daily lives eg. taxi, garbage truck, train etc. Do you have any ideas or suggestions for a fun lesson plan.... do you have any websites that could at least give ...
March 28, 2008

Science 4th grade
Why is it important for 4th graders to learn about animals that live in the ocean?
March 25, 2008

Chemistry; to drwls or drbob
i think i have posted this before except i forgot to put the decimal in the temperature. i was hoping you could help me now that it might make more sense. The total pressure in a flask containing air and ethanol at 25.7 C is 878 mm Hg. The pressure of the air in the flask at ...
February 4, 2008

Genetics
what is the chance of a woman having five female children in a row?
January 9, 2008

Chemistry
what is mm^2?
January 8, 2008

Digital Logic
How many flip-flops, in a shift register, would be required to hold an initial count of 16?
December 4, 2007

Digital Logic
The input voltage to a certain op-amp inverting amplifier is 10 mV, and the output is 2 V. What is the closed-loop voltage gain?
December 4, 2007

English Grammar
In the sentence "They are always late to the ball game.", what part of speech is "always" and "late"?
December 3, 2007

CALCULUS!
suppose that 3 <_ f prime of x <_ 5, for all values x. show that 18<_ f(8)-f(2) <_ 30 <_ signs mean less or equal to... im supposed to apply mean value theorem or rolle's theorem... i dont understand neither so i cant do the question! please help!
November 10, 2007

Algebra Word Problem
A rectangle's length is 8 cm more than three times it's width. If the perimeter is 128 cm, find the length and width. What is the equation for this?
November 5, 2007

Algebra
Thanks
November 5, 2007

Algebra
Can you show me how to do this problem please. Thanks. |4-6to the second power ÷ 2 |- |-6|=
November 5, 2007

Algebra Absolute Value
|-2/3(x-6)| = 12
October 27, 2007

algebra
How did you get the answer?
October 27, 2007

algebra
|10-2x|=18
October 27, 2007

History
Why did Jefferson as the Democratic-Republican candidate win the election of 1800? -Clearly stated thesis -Identify and describe 3 factors that influenced the outcome of the election -A conclusion that pulls the ideas together
October 18, 2007

History
is that good? =)
October 18, 2007

History
Thomas Jefferson won the election of 1800 due to his strong Democratic - Republican Party, Major support of the majority of the 16 states, and friendly help from the federalist Alexander Hamilton. Jefferson was able to win his election in 1800 due to the strong Democratic &#...
October 18, 2007

History
is this a good thesis? Thomas Jefferson won the election of 1800 due to his strong Democratic - Republican Party, Major support of the majority of the 16 states, and friendly help from the federalist Alexander Hamilton
October 18, 2007

History
Why did Jefferson as the Democratic-Republican candidate win the election of 1800?
October 18, 2007

Chemistry
A silver bar has mass of 368g. What is the volume, in cm^3, of the bar? the density of silver is 19.5 g/cm^3.?
October 11, 2007

Chemistry
The diamenter of a carbon atom is 77 pm. Express this measurement in um?
October 11, 2007

Chemistry
What are the 3 rule the govern the filling of atomic orbitals by electrons?
October 8, 2007

Chemistry
What the difference between an orbit in the Bohr model and an orbital in the quantum mechanical model of the atom?
October 8, 2007

Algebra
A suit designer has 15-3/5 yards of fabric. each suit uses 2-1/8 yards of fabric. (1) How many suits can be made? (2) How much fabris is left over?
September 30, 2007

PHYSICS
THE TYPICAL RADIO WAVE HAVE A PERIOD OF 1 US EXPRESS THIS PERIOD IN SECONDS
September 12, 2007

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