Saturday
October 25, 2014

Posts by amir


Total # Posts: 99

probability
0.33
July 13, 2014

Maths
1<p<12 Therefore a=1 b=12
October 8, 2013

physics
A 83 kg person escapes from a burning building by jumping from a window 21 m above a catching net. The acceleration of gravity is 9.81 m/s 2 . Assuming that air resistance is simply a constant 92 N force on the person during the fall, determine the person’s velocity just ...
December 18, 2012

Science
lol cool!! im in connections too in 7th grade
December 6, 2012

mATH
wat is 80÷3=?
June 10, 2012

math grade 11
in a reflection the image of the line y-2x=3 is the line 2y-x=9.find the axis of reflection.
April 28, 2012

Chemistry
thanks for the help. im still a bit confused.,, [23.5g x 6.02] + [? x 2.09 x (Tfinal- 0)] + [550.g x 4.184 x (Tfinal- 28.0)] = 0 is this right so far? How would you be able to get the mass of melted ice?
April 27, 2012

Chemistry
An ice cube at 0.00 degree celsius with a mass of 23.5 g is placed into 550.0 g of water, initially at 28.0 degree celsius, in an insulated container. Assuming that no heat is lost to the surroundings, what is the temperature of the entire water sample after all the ice has ...
April 27, 2012

Chemistry
balance this equation NaOH + H2SO4 = NaSO4 + H2O
March 15, 2012

calculus
Find the intervals on which the f(x)= cos^2x is concave up and concave down.
March 4, 2012

Math
2y^2 -8y -3 = 0 please solve
January 31, 2012

Math
2y^2 -8y -3 = 0 please solve
January 31, 2012

Math
2y^2 -8y -3 = 0 please solve
January 31, 2012

Math
2y^2 -8y -3 = 0 please solve
January 31, 2012

Math
2y^2 -8y -3 = 0 please solve
January 31, 2012

Math
please help
January 23, 2012

Math
prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA
January 23, 2012

MATH
THE LINE Y=X+4 INTERSECTS THE CURVE 2X^2 + 3XY - Y^2 + 1 = 0
January 23, 2012

MATH
THE LINE Y=X+4 INTERSECTS THE CURVE 2X^2 + 3XY - Y^2 + 1 = 0
January 23, 2012

matj
prove that (cotx+tanx)(cotx-tanx) = 1/(sin^2 x) - 1/(cos^x)
January 23, 2012

math
thanks
January 23, 2012

math
3+siny = 3cos^2 y for 0<Y<360
January 23, 2012

Math
how do i know if the tangent is positive in the third quadrant?
January 23, 2012

Math
solve 4 sin x = cos x for 0<X<360
January 23, 2012

Math
thanks man
January 23, 2012

Math
g(x) = 3x+5 / x-1 find the inverse function
January 23, 2012

Chemistry
You need to prepare 2 M solutions, with 10 g of solute. What volume of solution will you prepare for ammonium nitrate, NH4NO3?
December 26, 2011

IGCSE Chemistry
Thanks
December 25, 2011

IGCSE Chemistry
Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively. a) Which elements does a hydrocarbon contain? b) Calculate the empirical formula of A and of B. c) Calculate the molecular formula of A and B. I solved a) and b) the solutions are a...
December 25, 2011

Chemistry
i think it only has two bond angles that are 120 and 180 only
October 28, 2011

Math
A man and his wife share a sum of money in the ratio 3:2. If the sum of money is doubled, then in what ratio should they divide it so that the man still receives the same amount?
July 30, 2011

Chemistry
K2= +1 Cr=+6 o=-2
March 10, 2011

chemistry
1.2x10^-6
November 1, 2010

physics
at time t=0 the driver starts to brae determine how long the bus takes to stop
October 30, 2010

physics
A 2 kg box slides down a 25 degree ramp with an acceleration of 2 meters per second. Determine the coefficient of kinetic friction between the box and the ramp?
October 20, 2010

Chemistry
Please explain the process of diffusion.
August 24, 2010

AP Physics
See how to solve from a pro who is undergoing IGCSE courses which are better than US High School courses mgh=1/2mv^2 1/2mv^2=mgh mv^2=2mgh V^2=2mgh/m V= square root of 2gh
August 1, 2010

Trig
8 csc theta - 2=10 + 2 csc theta I can't do it. :S
May 16, 2010

College Admission
I am currently outside USA. Now in Asia we follow the Cambridge igcse curriculum. If I move to USA can I still get into an Ivy League college?
March 27, 2010

SAT
This is definitely not homework. I just want to know what would be the best book for preparing my self for the SAT.
March 12, 2010

Physics
Say what energy changes are taking place: a)clockwork toy b)boy kicking soccer ball c)boiling kettle on a gas ring d)person walking upstairs What are the wasted energy in a) b) c) and d)?
February 19, 2010

Physics
Metal expands more than glass when both are heated. How can this fact be used to help open a metal screw top on a glass bottle which appears to be stuck?
February 18, 2010

Algebra
x^2+y^2=86 and xy=(-16), Find the value of (x-y)^2 Please help i am a bit tense today so i can't figure it out.
February 14, 2010

Math
thanks a lot. I really apreciate your help.
February 12, 2010

Math
Please help me solve this equation -5t+2=-2t*2
February 12, 2010

Chemistry
Sulfur Trioxide can be dissolved to form sulphuric acid. But it is avoided since the reaction is violent. Explain why?
January 30, 2010

Physics
What is the difference between magnetic field of a bar magnet anf the magnetic field around a current-carrying coil? Please answer with a good explanation.
January 18, 2010

Math
5/6
January 18, 2010

math
The answer is A)11. In my country we do this in grade 7. You just need to use unitary method.
January 15, 2010

Physics
If you cut a magnet in half does each half become a magnet. Give a clear explanation to your answer.
January 15, 2010

Physics
My question is how does metal corrosion affect a reed switch? This question is from my textbook. We are following cambridge igcse science.
January 15, 2010

Math
The shipping department must send out 50 cases of quarters. Five stores will receive ten cases each. How many cases are left?
March 3, 2009

Math
ok thanks
January 5, 2009

Math
[x+5]> 1 -
January 5, 2009

Math
Solve the inequality: Absolute Value of X+5 is greater than or equal to 1. I'd appreciate someone telling me how to solve it and get the answer. Thank you
January 5, 2009

Math
Solve the inequality: absolute value of x+is greater than or = to1. What form do you put it in? I missed class, and would appreciate someone telling me how to do this problem. Thanks!
January 5, 2009

Science
What roles do these systems play in supporting cellular respiration? -digestive system -repiritory system -circulatory system
December 17, 2008

Distance Problems
A bus and a car leave the same place and travel in opposite directions. If the bus is traveling at 50 mph and the car is traveling at 55 mph, in how many hpurs will they be 210 miles apart. Again please help me with the boxes, Im in advanced math and I'm not good with the ...
November 4, 2008

Distance Problems
A bus and a car leave the same place and travel in opposite directions. If the bus is traveling at 50 mph and the car is traveling at 55 mph, in how many hpurs will they be 210 miles apart. Again please help me with the boxes, Im in advanced math and I'm not good with the ...
November 4, 2008

Distance Problems
John took a drive to town at an average rate of 40mph. In te evening he drove back at 30mph. If he spent a total of 7 hours traveling, what is the distance traveled by John? Please set up the boxes and help solve.
November 4, 2008

Distance Problems
James and tom are in 2 cities which are 186 miles apart and travel towards eachother. James' average rate was 32 mph, and Tom's average ratewas 36mph. If James started at 9:00am and Tom's startes at 9:30 what time did they meet? I need help settign up the boxes. SO...
November 4, 2008

Math
At 11:00am a car (1) leaves city "A" at a constant rate of 60 mi/hr toward city "B". AT the same time a second car (2) leaves city "A" at the constant rate of 50 mi/hr. The distance between cities A and B is 220miles and a highway used by the two ...
November 3, 2008

Math
2 cyclists start at the same tiem from opposite ends of a course that is 45 miles long. One cyclist is riding at 14 mph and the second is riding at 16mph. How long after they begin will they meet?
November 3, 2008

8th grade science
thanks again mr.bob i appreciate it
November 2, 2008

8th grade science
why is diffusion important to living things? (organisms) u get full credit no worries! =]
November 2, 2008

8th grade science
thanks! and I took your advice on my short story (deeper ever deeper) and I got a 100 I really appreciate what you did and I strongly look up to your critisism. ty
November 2, 2008

8th grade science
I need some websites for the answers to these questions: What is diffusion? What causes diffusion? Why is diffusion important to living organisms? Thanks, AMir
November 2, 2008

english check ms.sue
Ooh that must feel horrible flunking a coarse. Yeah.... wouldn't liek to plagerize...
November 2, 2008

Please read my short story deeper Ever deeper
It is close to the middle. U'll see it its the one with millions of comments and replies lol.
October 29, 2008

Please read my short story deeper Ever deeper
thanks for tellign me I guess I got to fix it. I really needed that but it wouldn't be that good when you can tell what the girl is thinking. That is why I wanted to surprise the reader by having the girl reject him. Please tell me what I should right. It's due tomarrow
October 29, 2008

Please read my short story deeper Ever deeper
Pleeeeeeeeeeeeaaaaaaaasssssssse read my short story, it's down here, and I need to have it read by ppl. - - - - - V
October 29, 2008

My short Story called deeper ever deeper
ty, Jake is a teen, but I guess your right about that no crying part. He's snesitive i guess? =] I'm kiddign thanks for the help
October 29, 2008

My short Story called deeper ever deeper
ty
October 29, 2008

My short Story called deeper ever deeper
“Emily, I was wondering if you’d like, I don’t know, like to have dinner with me maybe anytime this week?” Jake was sweating. He was actually doing it. He was looking deep into her eyes, and going deeper, ever deeper. But it was the wrong thing to do. “...
October 29, 2008

My short Story called deeper ever deeper
“I can do it,” Jake thought. “All I have to do is look deep into her eyes, and tell her.” Like that would be easy. He started walking towards her and as soon as he reached her, he kept going on to his next class. At his next class, all Jake could think ...
October 29, 2008

My short Story called deeper ever deeper
Please read this and tell me what you think. It's due tomarrow. Any constructive critisism is appreciated greatly. “Wow, she’s hot!” Jake Petri thought as he his gaze left his paper and trailed off to Emily Runner from across the classroom. If only he could ...
October 29, 2008

3rd grade
267 +307 ----- 574
October 29, 2008

Math age problem
louise is 4 years younger than jennifer now. In 10 years, louise will be twice the age that jennifer is now. Please help me set this up. It's an age problem.
October 29, 2008

math
louise is 4 years younger than jennifer now. In 10 years, louise will be twice the age that jennifer is now. Please help me set this up.
October 29, 2008

Question (Literature)
There is one quote but i forgot who said this: "no science can replace a myth, and no myth can ever replace science." Basically I think what it means is that literature and science are complete opposites. Hope that helps.
October 28, 2008

Spanish
tysm ur a genius
October 28, 2008

Spanish
how do you say: That is teh coolest thing I have ever heard in my life! in spanish. Tysm
October 28, 2008

Dr. bob please help-chemistry
Use the ruler to measure the circumference of the marble as accuratley as you can, then divide the circumference by 3.14159, or pi. That should give you your answer.
October 27, 2008

math
Oh sweet rhombus, called diamond so, beautiful and glamerous, you put up quite a show, in geometry you are a pain, but on your finger you are bright, so this is a poem about rhombus, I recited it tonight. This is something that I just made up at the top of my head... You might...
October 27, 2008

psychology
The production of new brain cells is neuro-transmitters, and mylen. I hope this helps!
October 27, 2008

5th grade
well what you could do is find a lcd or least common denominator between these numbers. In this case I believe its 560. 560/10=56, 560/8=70,569/7=80 Now you get 7/10= 392/560 5/8=350/560 3/7=240/560 I hope this is what your looking for... =]
October 27, 2008

math
This is my work: D-1 5 -----= -- Cross multiply you get: 2D-2 4 10D-10=4D-4 -4D -4D 6D-10=-4 +10+10 6D=6 ----- 6 6 D=1?
October 27, 2008

OOPS again math
Oh now I get it. in the last step 3D=39 ----- 3 3 so D=13 tysm! your a genius.
October 27, 2008

math
The numerator of a fractionis 5 less than twice the denominator. If the numerator is decreased by 1 and the denominator is increased by 3, the value of the new fraction is 5/4. Find the original fraction.
October 27, 2008

math
thanks thats what i got just making sure =]
October 27, 2008

math
is it 60 im confused i missed class today so, i really didn't get the whole of the lesson. =)
October 27, 2008

math
find two consecutive even integers such that 5 more than the first is divided by 2 less than the second, the result is 13/12.
October 27, 2008

algebra
a+6a=7a 7a+(-9) =30 add -9 to both sides 7a=21 divide 7 by both sides a=3
September 11, 2008

science
thank you!!
September 11, 2008

science
is the density of a metal (like aluminum) the same no matter what the size of aluminum?
September 11, 2008

algebra
4n-2n = 2n 2n=18 divide both sides by 2 to isolate the n n=9
September 11, 2008

Math
assuming you can use the numbers more than once.... 24/2 = 12 12*12 = 144 144/2 = 72 72-24 = 48 48-24=24
September 11, 2008

math
-7 1/8 + 4 3/4 -7 1/8 + 4 6/8 -6 9/8 + 4 6/8 now subtract -2 3/8 - bud is correct.
September 11, 2008

chemistry
Hi. I'm not sure if my strategy for this problem is correct: How many grams of CaCO3 will dissolve in 3.0x10^-2 mL of 0.050M Ca(NO3)2? I think I'm supposed to convert molarity of Ca(NO3)2 into moles, but then i don't know how to get from mols of that to mols of ...
May 17, 2008

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