Thursday
June 30, 2016

Posts by Chen

Total # Posts: 60

Chemistry
A solution is 0.10M in aqueous NH3. Calculate (a) the number of moles and (b) the number of grams of NH4Cl that must be added to 500mL of this solution to prepare a buffer solution with pH=9.15. You may neglect the volume change due to addition of solid NH4Cl. Kb=1.8x10^-5. (...
February 17, 2016

science
A body of mass m=2.6 kg is standing on a ramp inclined in an angle of α=14.9 degrees. The static friction coefficient between the ramp and the body is μ=0.29. The ramp, which is inclined to the left, is in a train, which accelerates to the right. What is the minimal ...
December 26, 2015

Math (Statistics)
jean has an IQ that corresponds to 81% percentile rank. if there are 21 girls in the group, how many of them have an higher IQ than Jean? thanks...:)
December 14, 2015

math
solve each equation.write each equation in simplest form 7x/8=21 a.24 b.18.375 c.1.857 d.19
December 2, 2015

Math
The passenger bus starts out and travels at 65 kilometers per hour. three hours later, a car starts out from the same place and overtakes the bus in 8 hours and 40 minutes. what is the rate of the car?
October 14, 2015

Math
solve by substitution x+y=5 x+y=3
October 14, 2015

Math
1. if the largest of three consecutive even integers is multiplied by 5, the product is 6 less than three times the sum of the first two integer. fin the integers.
October 14, 2015

Math
1. find the two consecutive number such that five-eights of the smaller number equals three-fifths of the larger number. 2. separate 221 into two parts such that their quotient is 8/9. thanks...
October 14, 2015

Chemistry
You pass a road sign saying "New York 112 km." If you drive at a constant speed of 65 mi/h, how long should it take you to reach New York? If your car gets 28 miles to the gallon, how many liters of gasoline are necessary to travel 112 km?
July 18, 2015

Chemistry
Thank you very much.God bless
July 14, 2015

Chemistry
If your car gets 28 miles to the gallon, how many liters of gasoline are necessary to travel 112km? I need the answers so badly. Thank you very much.
July 14, 2015

Algebra
Thanks alot .
June 9, 2015

Algebra
Please simplify. 1.) (c^-3)^2d^4/d^-2= 2.)(e^4)^-3f^-5/f^-2= 3.)(8^-7/8)^-2= thank you. :)
June 9, 2015

Algebra
Thank you thank you. (*^_^*)
June 9, 2015

Algebra
express using positive exponents. simplify each. please (-5c^-3)^4=? thank you
June 9, 2015

physics
1. While strolling along on unknown planet, an astronaut decides to throw a hammer and a feather upwards at 5.0 m/s. They both return to the point of release in 3.0 s. What is the acceleration due to gravity on Planet X. 2. Marii jumps straight upward at 15.0 m/s. How high is ...
January 12, 2015

math
Thanks... :)
December 1, 2014

math
The line segment joining ( -3,-4) and (6,11) is to be divided in to three (3) equal parts. Find the coordinates of the point of the part closest to (-3,-4). Please help me..
December 1, 2014

English/grammar
thanks :)
November 14, 2014

English/grammar
please find the error: 1. To whom is this wallet that was found in the room yesterday? 2. A man with five children have a large family to support. thanks... :)
November 14, 2014

math
Thank you very much. :)
November 10, 2014

math
ah.. in the unit circle i think!
November 10, 2014

math
following
November 10, 2014

math
please find the ordered pair of the ff: 1.) 30 degrees 2.)60 degrees thanks... :)
November 10, 2014

math
What is the factor of x^2+8x+8. thanks...
September 10, 2014

math
thanks a lot... :)
September 3, 2014

math
Find the x-intercept and y-intercept (zeroes of the function) 1.) P(x)=x^4- 9x^2 2.) P(x)= 2(x-5)(x+2)^2
September 3, 2014

math
thanks.. :)
September 3, 2014

math
find the base of the exponential function whose graph contains the given points. 1.( 4, 1/625) 2.(3/2, 27) 3.(3, 1/343)
September 3, 2014

math
list all the possible integral zeros: P(x)= x^3-2x^2-11x+12
August 13, 2014

math
please anwer these: 1) how can i multiply and divide polynomials containing radicals? 2) how can i solve radical equations? 3) how can i solve qudratic equations by factoring ? 4) how can i solve quadratic equations graphically ? thank you !!!!!
August 13, 2014

math
how many factors does this polynomial has? please.. i really need your answers. asap!
August 6, 2014

math
can you give me two more factors please.... i've already tried numbers 9 to 25.
August 6, 2014

math
please find it's factors 2x^3+5x^2+4x+1 thanks
August 6, 2014

physics
thanks mate...
August 4, 2014

physics
Compare the work that a 22-kW car engine does in 60 seconds if its efficiency changes from 100% to 75%.
August 4, 2014

science
1.) what energy transformation are taking place when a ball is dropped from 1.0 m, bounces and tries to 0.80 m, bounces again and rises to 0.64m? What is the efficiency of the energy transformations of ball during a bounce?
August 4, 2014

physics
A cart of mass m = 1.10 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 2.12¡À0.06 m/s and vf = 0.60¡À0.08 m/s. Calculate the following quantities ...
February 19, 2014

math
fsdffs
February 9, 2014

calculus
At midnight, ship B was 90 km due south of ship A. Ship A sailed east at 15 km/hr and ship B sailed north at 20 km/hr. At what time were they closest together?
February 5, 2014

calculus
At midnight, ship B was 90 km due south of ship A. Ship A sailed east at 15 km/hr and ship B sailed north at 20 km/hr. At what time were they closest together?
February 5, 2014

physics
at what inclination should the object be released from rest if it is to reach a maximum horizontal distance of 2m as shown. coeff of friction is 0.37 for all surfaces of contact.
March 1, 2013

Math
the measure of an angle is 27 less than twice the measure of it complement.Find the measure of each angle what would the equation be
November 15, 2012

Math
A new quarterback has to pick two number that will go on his football shirt. How many pair of number can be make from the digits 3,5,7,and 9? What are all the possible choice?Explain how you arrived at your answer.
October 23, 2012

Chemistry
A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an open polystyrene ...
November 6, 2011

Chemistry
A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an open polystyrene ...
November 6, 2011

algebra
-7|2x+21|-7=42 set notation and solution
October 7, 2011

Caculus
integrate x^(1/2)e^x.dx from 0 to 4, n=12 1) the trapezoidal rule
November 24, 2010

computers
organize the documents into folders based on there topic aor type. :) hope this helped
July 8, 2010

12th grade
this is not possible because 3x and 3 are not like terms. in order to add you must have like terms. :)
July 5, 2010

home economics
home economics are simple things around the house like cleaning, cooking, ect.
June 18, 2010

home economics
cambells
June 6, 2010

Management
I am collecting ideas for the following question. Any help would be appreciated, thanks. Please give an example of good or bad management control based on your own experience.
May 12, 2010

french
It means "will you give me a present for my sisters birthday?" also in response to SraJMcGin, "anniversaire" never refers to the word anniversary on the word birthday
April 13, 2010

government and economic
banker, doctors, corporation presidents, and wall street lawyers (the traditional elite) veruss government officials, research scientists, professors, and the mass media. Which group would benefit most from each of the following developments? - Large-scale nationalization of ...
October 19, 2008

stupid test online
celery!
February 6, 2008

How to send gifts to China in a strange country?
The Thanksgiving Day is coming. Do you have some ideas about it? For western people, it is more important than us Asian. But this kind of custom influences us gradually. So, this Thanksgiving Day I want to send some interesting gifts to my families, friends and others in order...
November 20, 2007

english
In the book "The English Patient".Why did Hana decide to have an abortion during the war? How has that decision affected her, and how much influence has it had on her life at the villa? umm read the book
September 27, 2006

english
In the Book, "the English patient".What can you deduce from the novel about Hana's relationship with her father? Has her father's death, and the manner of it, caused her to retreat from the war and devote herself to the English patient? What influence do her ...
September 27, 2006

english
In the book "The English Patient",The English patient "whispers again, dragging the listening heart of the young nurse beside him to wherever his mind is, into that well of memory he kept plunging into during those months before he died" [p. 4]. Why does ...
September 27, 2006

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