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September 17, 2014

Posts by jonathan


Total # Posts: 299

Math - Pre- Clac
Prove that each of these equations is an identity. A) (1 + sinx + cos x)/(1 + sinx + cosx)=(1 + cosx)/sinx B) (1 + sinx + cosx)/(1 - sinx + cosx)= (1 + sin x)/cosx Please and thankyou!
December 14, 2009

Math
The sum of John's age and twice of his son's age is 56. In 8 years time, the son's age will be half of john's age. Find there present ages. Right now I wrote down an equation x+2y=56 and not quite sure what to do next.
October 31, 2009

Math
if a^2-b^2=10 and a-b=2 what is the vlaue of a+b
July 9, 2009

science
what are some interesting facts about the sun?
May 11, 2009

science
Why should you visit the sun? what is special about it?
May 11, 2009

science
where is the sun located.
May 11, 2009

Government.
The main reason why the Constitution dealt specifically with the crime of treason was that: A. The framers wanted to prevent all treason in order to protect the democracy. B. Treason was not considered a serious crime before the Constitution was written. C. Treason was a crime...
April 21, 2009

genology
well they find a way to get close to the valcanoe
February 14, 2009

genology
well they
February 14, 2009

science
word containing the word rock with ice only
January 5, 2009

Economics
Pls advise.. The max units of good A is 180 The max units of good B is 60 In general terms, what happens to the opportunity cost of good A as the output of good A increases? In general terms, what happens to the opportunity cost of good B as the output of good B increases?
December 16, 2008

MATH
X-4=3x+12 X=? please help
December 9, 2008

rudcing fractions
10 100
October 25, 2008

physics/math
A car moves at 12 m/s and coast up a hill with a uniform acceleration of -1.6 m/s^2..What is its displacment after 6 sec.? What is its displacment after 9 sec.?
October 20, 2008

math
how do i find the raidis of a sphere? sa= 36*22/7 in sq
October 16, 2008

Macroeconomics
I have an assignment question regarding the impact of reducing the government's budget deficit by reducing government purchases. I have to develop a S/D graph with curves to illustrate this impact. I know that when the government makes purchases and runs a deficit, supply ...
October 2, 2008

Math!!!
kk ty bro
September 27, 2008

Math!!!
A=(-7,-18),B=(3,y),C=(x,6) and the slope of the line=3/5 x=? y=?
September 27, 2008

math
using the terms factor,divisor,multiple,product,and divisible by,write as many statements as you can about the number sentence 4x7=28.
September 15, 2008

Math - Factors
using the terms factor,divisor,multiple,product,and divisible by,write as many statements as you can about the number sentence 4x7=28.
September 10, 2008

math
5x+1=6 x=?
September 4, 2008

Math
Do i mulitply the equation my 5,3?
August 23, 2008

Math
One-third the sum of a number N and 5 is 2 more than one-fifth the sum of N and 3. N= ?
August 23, 2008

PreCalc
What is the real solutions of this equation? sqrt(2x+3)-sqrt(x+2)=2
August 16, 2008

Math
thank you!
July 26, 2008

Math
When a rock is put into a tank full of water, water is displaced and is collected by a container. If the base of that container is 12cm x 15cm and the water level is 4.5 cm, what is the volume of the rock?
July 26, 2008

Redox Half Reactions
Half reaction of 2 Al2O3 + 3 C → 4 Al + 3 CO2
May 24, 2008

Aluminium Bauxite (is water needed)
Is water needed in the extraction of aluminium from bauxite in either the Bayer or Hall-Heroult proccesses? Please reply as soon as you can :) hehe
April 20, 2008

Maths
i knew that was wrong, coz my answer should be in the 50's haha..thanks though, great help can i ask how you got sinA and sinB with that information :) no point in me just copying it i would like to know how you got it
April 17, 2008

Maths
well, i got: (-4/5)(12/13) - (4/5)(7/13) therefore (-48/65) - (28/65) therefore: answer = (-76/65)
April 17, 2008

Maths
yeah thats right, can u go on?
April 17, 2008

Maths
if cosA = 4/5; sin <0; cosB = 12/13; 0<B<90, determine sin(A-B) thanks ... :)
April 17, 2008

Science
I desperatly need help, i need to know everything there is to know about the recovery of ALUMINIUM that is recovered from BAUXITE ORE, the process, the cost, everything. Please, if you have any knowledge or know of any GOOD webpages, please post them here. thanks:)
April 17, 2008

science
What is the difference between RNA and DNA that can be used to separate them from one another?
April 9, 2008

Math
Factorise: a)x squared - 5x b)x squared - 81
April 7, 2008

geography
name at least two state capitals that have two or more words in their names
April 2, 2008

Chemistry
What are compunds that are composed of molecules called?
March 12, 2008

Chemistry
The nuclide 12 N 7 is unstable. What type of radioactive decay would be expected??? my guess is either gamma or beta. are either of those correct?
March 4, 2008

Nuc. Chem
Oh okay so for this one would it be: 40 Ar 18???? thanks so much for your help!
March 4, 2008

Nuc. Chem
HELP!!! I have like 20 of these kinds of questions on my homework and no clue how to solve them. Electron capture transforms 40 K 19 into what nuclide?!?! Thank you
March 4, 2008

Trig word problem
A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...
February 24, 2008

trigonometry
In triangle ABC, a=8, b=15, and m<C=40 degrees. Find the area of the triangle to one decimal place.
February 24, 2008

trig WORD PROBLEM
A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point C, how far is it ...
February 24, 2008

trig
In triangle ABC, find <A to the nearest tength of a degree is m<B=95 degrees , b=15.4, a=8.0
February 24, 2008

trig
Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:
February 24, 2008

pre algebra
2x+3y=6 2x=6-3y [subtract 3y to solve for x] x=(6-3y)2 [divide by 2 to get x by itself] 2x+3y=6 3y=6-2x [subtract2x to solve for y] y=(6-2x)/3 [divide by 3 to get y by itself]
February 24, 2008

CHEMISTRY
could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...
February 21, 2008

science
nucleotide monomers a nucleotide is composed of: A Nitrogenous Base (purine or pyrimidine) A Five-Carbon Sugar A Phosphate Group
February 20, 2008

Chem Urgent!
the atomic mass in the periodic table represents the number of grams per one mol of lead. so there are 207.1 g per mol of lead.
February 20, 2008

French
oui, partager [the infinitive of partage] means share.
February 20, 2008

AP CHEM-URGENT PLEASE
could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...
February 20, 2008

Chemistry
HELP! we just started kinetics and i have no clue how to solve this problem. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g...
February 20, 2008

Chemistry
thanks!
February 14, 2008

Chemistry
why does the value of i (van t' hoff factor) change with regards to theoretical vs. experimental? i'm not quite sure what happens but i know it has to do with ions in the solution. could it be attractive forces between ions?
February 14, 2008

CHEMISTRY
thank you so much! the molar mass was a major problem...i didn't realize i was so off. thank you for pointing that out.
February 14, 2008

CHEMISTRY
For a lab, I have to find the experimental values of i (Van T'Hoff factor). so far this is what i have, but it's incorrect. could you please tell me what i'm doing wrong??? thanks. given info: the lab varied the concentration of Mg(NO3)2 the theoretical value of i ...
February 14, 2008

Chem=continued
thank you. i'm confused thought....i tried to use a formula that already had molality in it because i don't have a mass to use, hence the g/GMW kg portion. i need to use 175 mL and make it boil at 245 degrees F.
February 11, 2008

Chem=continued
I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...
February 11, 2008

AP CHEM
I'm currently working on a lab in which I have to make the solution boil at 245 degrees F. The solution will be a mix of ethylene glycol and I have to caluculate the volumes of water and solute needed to make the solution. here's my work so far. X= mL C2H4(OH)2 175mL-X...
February 10, 2008

math
Tom is now 25 years older then his son. In 10 years, Tom will me 5 years younger than 3 times his sons age. how old is tome now?
December 15, 2007

math
there are 50 question in a test. a student gains 2 marks for a correct anwser and loses 1 mark otherwise. if a student has 76 marks, how many question did he answer incorrectly?
December 15, 2007

math
an apple cost 20 cent and a orange cost 25cent. if teh total number of apples and oranges is 20 and the total cost is 4.55, how many oranges are there?
December 15, 2007

math
omg ty u are a super pro
December 15, 2007

math
There are 9 more quarter then dimes.if the total value of the coins is 6.8, how ,any quarters are there?
December 15, 2007

math
how do you solve for 2/3 * ? = 20
October 24, 2007

science
what is a set of actions that a living thing is born with and does not need to learn called
October 17, 2007

Physics
dont no
September 13, 2007

Algebra II
Solve x^2>_2x+24 x^2-2x-24>=0 (x-6)(x+4)>=0 So as long as x>6, it works. But what about two negatives? Try x=-5..checks...check me on that. So it looks as if -inf<x<=-4 works, and 6<=x<inf works. check that.
August 8, 2007

Algebra II
Write y=x^2+4x-1 in vertex form. y=x^2+4x-1 y=(x^2+4x+8)-1-8 y=(x+2)^2-9 This isnt one of my answer choices,what am I doing wrong? in second line: y=(x^2+4x +4 )-1 +4 (take one half of the middle coefficient, then square it) y=(x^2+4x + 4 )-1 - 4
August 8, 2007

Algebra II
Solve x^2+2x=-2 by graphing and indicate the roots.Please and thank you We can't draw graphs for you here. The roots are x = -2.73 and -0.73 I suggest you make your own graph of y = x^2 + 2x and see where it crosses the horizontal line y = -2. Choose x values of -4, -3, -2...
August 8, 2007

algebra II
Help me solve this problem that I missed, so that I can see where I went wrong. Synthetic Division (3X3 -2x +5). (x-2) I would set it up with the following algorithm to do synthetic division (this is how I do it and how I taught it, the ----- are simply there to keep the ...
August 7, 2007

Documenting a website for research paper
I cant find it in my text book, can someone tell me how you document a website for the bibliography. also in parenthetical foot note things in the paper do you just use the author of the website? oh also, if the site doesnt tell the author??? (Broken Link Removed) Hold your ...
July 2, 2007

Alexander the great fact
I have a research paper due shortly and well when i was taking notes i didnt label a few of them(stupid i know) so now, I returned the books to the library, and i wrote the paper, and one fact which I think is good is that the seers he brought with him said the gods were ...
July 2, 2007

math
8 workers together at the same rate finished a painting job in 5 hours. hour long would it take 12 such workers working at the same rate to finish the same job? each worker finished____(fraction) of the job in one hour. 12 workers finished_____(fraction) of the job in one hour...
April 13, 2007

Physics
The 2-cm (radius) current loop shown in the figure is changing from θ1 = 11 degrees to θ2 = 66 degrees in a magnetic field 2 T in 0.5 seconds. What is the magnitude of the induced emf to the nearest hundredth of a millivolt? The wire in Problem 2 has ...
March 27, 2007

Research Paper
can someone tell me what the MLA style is? my textbook is requiring it for my paper but is not explaining it? Here are some MLA websites; the first one is the most thorough and the best: (Broken Link Removed) http://owl.english.purdue.edu/owl/resource/557/01/ Please repost if ...
March 9, 2007

Japan
social studies) Question:How many distance is Japan from the US? It is 6760 from New York Ciy to Tokyo It is 4791 miles from Seattle to Tokyo It is 3862 miles from Honolulu to Tokyo It is 2444 miles from Anchorage to Sapporo Take your pick The last entry (2444 miles) is ...
January 22, 2007

word riddle help please
what material is something that a person doesn't have?
December 11, 2006

lively
Suppose that four times the square of a number equals 20 times that number. Whatis the number? It'll take you 45 seconds if you just plug in a few numbers Again -- putting the subject in the subject line helps. =) 4 n^2 = 20n zero is one solution. Solve for n.
November 26, 2006

lively
Suppose that the width of a certain rectangle is three-fourths of its length, and the area of that same rectangle is 108 square meters. Find the length and the width of the rectangle If you put the correct subject in the subject line, you're likely to get a faster response...
November 26, 2006

Economic
marketing
November 26, 2006

Research Paper
I have to write a research paper but I dont know what to pick as a topic. I want something simple. Last time i chose Napoleon and it was overwhealming. Can anyone suggest a simple topic that is easy to research. Preferable historical. Mozart disco John Kerry some topics that ...
November 3, 2006

world geography
The native people of Australia are known as
November 1, 2006

communications
simple subject notes Please explain more exactly what you need and we'll be glad to help you.
October 11, 2006

science
d. a beak and wings
September 25, 2006

Math
which fraction is less than 6/7 a)9/8 b)8/9 c)10/8 d)13/14 e)5/9
September 15, 2006

physics
what is is called (both terms) when somthing makes a sound but no one is aroun to here it? Plz this is 4 my h work It could be many terms. Unobserved Source comes to mind. Surely you are not wasting much class time in physics class on this.
September 6, 2006

maths
what is the largest domain of the following functions f(x)=3x-5 f(x)=square root of (x+4) f(x)= 2 over x-4 f(x)= sqaure root of (x2-9) f(x)= 2 over x(x+7) Hopefully you've solved these by now. I just noticed the question and see there's no reply. The question is "...
September 1, 2006

Type Sketch - Cynic
I have to do a type sketch of a cynic...but i really am running out of ideas...this is what I wrote so far but i need a couple more points. Any ideas please? ************************************* The cynic is a person who is skeptical of life. They are weary of the motives of ...
July 14, 2006

Report on Middle Class Today!
I got this assignment and I have to do it TODAY! Write an essay on the necessity of a content, hard-working, middle class to the maintenance of a democratic government. I really have no idea what to write and i need to have it done today. Can anyone please give me some ...
June 28, 2006

History - Vercingetorix
I have to write a report on the Gallic king Vercingetorix. It needs to be 1 - 2 pages long but I cannot find very much information on the web.(ive seen Wikepedia ect..) Could anyone refer me to a website containing information on him? I have to finishe this report in 2 days. ...
June 19, 2006

Algebra 2
I have no clue on this one. How would you solve: us the (IN) key to express each number as a power. Then use the rules of logarithms to find the answer. (45,332 x 10^5)(33,654 x 10^-4) ------------------------------- 93,153 (that is a fraction.) please help.
June 18, 2006

Algebra 2
how would you solve: the current in the river flowed at 3 mph. The boat could travel 24 mph downstream in half the time it took to travel 12 mi upstream. what was the speed of the boat in still water? please help. The time required to go any distance upstream a distance L is L...
June 18, 2006

MATH EMERGENCY!!
Please help. I know I asked this before, but the answer was lost during the upgrade. Show that 0.00317 is a rational number by writing it as a quotient of integers. (the 317 has a line over it.) please help. thats hard really hard im in grade 5!!!!
June 15, 2006

Algebra2 again
How do you: Complete the square as an aid in graphing. [I put exponents in ().] y = x(2) + 4x - 2 Please Help? The complete square of the x^2 binomial is x^2 + 4x + 4 = (x+2)^2 Therefore, add 6 to each side of the equation and you will have this still-valid equation with a ...
June 11, 2006

Algebra2
How do you get: Show that 0.00317 is a rational number by writing it as a quotient if integers. (the 317 has a line above it.) Please Help? Bob Pursley showed how to do that very question in an earlier post. Look back perhaps 2-3-4 days and you will find it. I did look earler...
June 11, 2006

math question corrected
a farmer bought chickens, goats and sheep. the cost of a chicken is .50 goat is $3.50 and sheep is $10 He bought 100 animals and spent $100. how many of each animal did he buy please help! I need this for school tomorrow Since you have two equations and three unknowns, there ...
August 18, 2005

math
a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how many of each animal did he buy If this is an algebra problem, you need to know the cost of each animal. There is not enough information. sorry, the cost of a chicken is .50 goat is $3.50 and ...
August 18, 2005

math
a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy a farmer bought chickens, goats and sheep. He bought 100 animals and spent $100. how much of each animal did he buy I assume he bought all of each animal. It is ...
August 18, 2005

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