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August 28, 2014

Search: mathematics: algebra;equations

Number of results: 35,887

Chemistry
Write equations for the stepwise formation of each of the following complex ions. (Type your answer using the format CO2 for CO2, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-. Use the lowest possible coefficients.) (a) Ni(CN)42- (b) Mn(C2O4)22-
March 17, 2013 by Howard

Chemistry
Write equations for the stepwise formation of each of the following complex ions. (Type your answer using the format CO2 for CO2, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-. Use the lowest possible coefficients.) (a) Ni(CN)42- (b) Mn(C2O4)22-
March 17, 2013 by Howard

Solving Rational Equations
Markus jogs 4 mi around a track at an average rate of r mi/h THen he cools down by walking 1 mi at a rate 3 mi/h slower. His whole workout lasts 1 h. At what rates did Markus jog and walk?
October 23, 2013 by Stacey

Solving Rational Equations
Markus jogs 4 mi around a track at an average rate of r mi/h Then he cools down by walking 1 mi at a rate 3 mi/h slower. His whole workout lasts 1 h. At what rates did Markus jog and walk?
October 23, 2013 by Stacey

Math - vector equation of a parallelogram
The vertices of a parallelogram are the origin and the points A(-1,4), B(3,6), and C(7,2). Write the vector equations of the lines that make up the sides of the parallelogram
September 4, 2010 by Shaila

Math - vector equation of a parallelogram
The vertices of a parallelogram are the origin and the points A(-1,4), B(3,6), and C(7,2). Write the vector equations of the lines that make up the sides of the parallelogram
September 5, 2010 by Shaila

math
the system of linear equations below has a unique solution for all but one value of a: 6 x−12 y=−6 58 x+a y=−58 What is this exceptional value for a?
October 26, 2010 by Tiff

Chemistry
Write equations for the following reactions: the combustion of propane the incomplete combustion of propane to for CO and water the complete combustion of 8,8-dimethylpropane in oxygen
December 5, 2010 by Amanda

Math
Are all linear equations functions. I'd say yes. Because both contain domain and range. But..not all are graphed linear. when is a linear equation not a function?
February 18, 2008 by James

math (am i correct)
5x-4y=24 4y-5x=-24 what is the solution of the systme of equations? ( i guess no solution) is the sytem consistant or inconsitatn? (i guess con) is it dependent or independent (i guess dependen)
July 1, 2009 by scooby9132002

math am i correct?
5x-4y=24 4y-5x=-24 what is the solution of the systme of equations? ( i guess no solution) is the sytem consistant or inconsitatn? (i guess con) is it dependent or independent (i guess dependen)
July 2, 2009 by scooby9132002

math
what are situation and solution equations? example question is: People in a marching band stand in 8 equal rows. There are 56 people in the band. How many people are in each row?
October 13, 2010 by bridget

math
The equations y=-2X+12, y=6-X, and X=0 enclose a region in quadrant I. when that region is reflected over the line y=6-X, a portion of the reflection is in quadrant II. Find the area of that resulting region.
January 11, 2011 by Josh

geometry
Given that Vector BD Angle ABC, Measures Of Angle ABC =6x - 12, And Angle = 72 Degres, Which Equations Could Be Used To Find The Value Of X? A - 6x - 12 = 72 B - 1/2 (6x-12) = 72 C - 2(6x - 12 = 72 D 6x - 12= 2(72) Can Anyone Help Me How To Solve Or Help Me On Anything
September 2, 2011 by jacob

Equations of a Circle
Write the standard for of the equation of the circle that passes through the points at (0,8),(8,0),and (16,8). Then identify the center and radius of the circle. I have r=8, center=(8,8). What now?
April 21, 2012 by Some1 Help Me Plz

college mathematics
10. If the argument below is valid, name which of the four valid forms of argument is represented. If it is not valid, name the fallacy that is represented. If I sing in the shower, then I will not be overheard while singing. I was not overheard while singing. Therefore, I ...
February 7, 2012 by cody

Math
Application of Quadratic Equations The base of a triangle is longer than twice its corresponding height by 1 cm. The area of the triangle is 105 cm(square). Find the height of the triangle
July 5, 2010 by Gilda

Math
I need help with these questions: Copy the equations. Add brakcets to make each one true. a) 7 - 5 to the 4th power divided by 8 = 2 b) 3 x 2 - 5 to the 10 power = 1 c) 39 - 4 + 6 divided by 3 to the 2nd power = 3
October 29, 2007 by Sandra

Geometry
If the length of one base of a trapezoid is 5, the length of the other base is 2x + 7, and the length of the midsegment is 6x 24, what is the value of x? Show equations and all work that leads to your answer.
January 22, 2010 by Alyssa

New Age Math
A value of the number m for which there is either no solution or an infinite number of solutions (u,w) to the system of equations shown below is: 6⁢u-w=6 m⁢u+6⁢w=-2
February 5, 2011 by Jack

college math HELP!!!!!
i need to find equilibrium price using these two equations: P= -(1/25)x+190 P= (1/75)x+70 the equilibrium quantity is: 2250 units the equilibrium price is: ______?
January 20, 2014 by Dee

Alegbra
The length of a pool is 3 feet more than twice its width. If the perimeter of the pool is 72 feet, find the dimensions of the pool by writing and solving a system of equations.
February 27, 2014 by EddieG

Alegbra
The length of a pool is 3 feet more than twice its width. If the perimeter of the pool is 72 feet, find the dimensions of the pool by writing and solving a system of equations.
March 2, 2014 by BrianP

Mathematics
Four people are standing in a line, each facing forwards. They are not allowed to move, turn their heads or speak (except to give the answer). The fourth is behind a partition wall and can neither see nor be seen by the other candidates. Each is wearing a backpack of unknown ...
October 12, 2007 by Mark

chemistry(Please check)
1)Which thermochemical equation and data does not agree with the other two written? a) 2NO (g)+ O2 (g) ->2 NO2 (g) deltaH=-169.8 b) NO (g) + 1/2 O2 (g) -> NO2 (g) delta H = -56.6 c) 4 NO2 (g) -> 4 NO (g) + 2 O2 (g) delta H = +226.4 d)all three equations are in ...
January 20, 2012 by Hannah

pre-algebra
Simplify- (-2c+d)(-5)+3(-2c)(-8d) Solve the Equation- y/12= -3 -9+a=11 Here are rules that will help you. http://cstl.syr.edu/FIPSE/Algebra/Unit3/combine.htm I hope it helps. Thanks for asking.
March 7, 2007 by Janet

Math
Application of Quadratic Equations. A girl's age in 12 years' time is the square of her present age. Find her present age.
July 5, 2010 by Gilda

Math help
Fimd the market price and demand for the pair of supply and demand equAtions: supply: Q=88p+653 Demand: q=1903- 37 p
March 31, 2012 by Janine

Trigonometry
Sketch the curve represented by the parametric equations x = 3 cos θ and y = 3 sin θ for 0≤θ≤π
November 30, 2013 by Dave

Trigonometry
19. Sketch the curve represented by the parametric equations x = 3 cos θ and y = 3 sin θ for 0≤θ≤π
December 1, 2013 by Anonymous

equations & inequalities
1.simplify this expression 4p+9+(-7p)+2=? a.3p+11 b.3p+7 {c.-3p+11} d.11p+11 2.solve this equation 4y+228=352 a.y=-31 {b.y=31} c.y=145 d.y=3 3.solve this inequality 3p-16<20 a. p<1/3 b. p<1 1/3 c. p<12 d. p<-12 4.solve this inequality 3b-7<32 a. b<5 b. b&...
December 15, 2013 by cali

Mathematics
A space camera circles the Earth at a height of h miles above the surface. Suppose that d distance, IN MILES, on the surface of the Earth can be seen from the camera. (a) Find an equation that relates the central angle theta to the height h. (b) Find an equation that relates ...
February 22, 2008 by Javier

Discrete Mathematics
There are two plans for renting a car. Plan A charges $10 per day plus a $50 one-time fee. Plan B charges $15 per day plus a $30 one-time fee. How many days must you rent the car for Plan A to be a better deal than Plan B?
July 30, 2013 by Joy

pre-calc
I am trying to get the polynomial; x^7+2x^6+3x^5+4x^4+6x^3+6x^2+7x+8 divided by; x^5-2x^4-3x^3+5x^2+2x-3 into a partial fraction form so that I can create a system of equations to solve for. So far, after dividing I have (x+1)(x-1)^2, and (x^2-x-3) as factors along with an ...
May 29, 2009 by John

Phyics
Balance the following equations? a) Fe(OH)2 + 2O2 + 3H2O Fe(OH)3 (b) 5Sr + 6H2O 7Sr(OH)2 + 8H2 (c) 9Al + 10Fe3O4 11Al2O3 + 12Fe (d) 13Pb(NO3)2 14PbO + 15NO2 + 16O2 (e) 17O2 + 18N2H4 19H2O2 + 20N2 (f) 21C4H10 + 22O2 23CO2 + 24H2O
October 16, 2010 by Ashley

Algebra
We are learning using the log button in algebra. I have a TI-83 calculator. My book says that log10 85 (there is no space between thet 10 and the 85, that's just to show the different numbers) is equal to 1.93 approximately. But I got 85. How do you properly type this in? ...
January 17, 2009 by Tatiana

Algebra--Correction?
Solve 4(2x-3) < 3x+6 Would the solution be x > 18/5? * Algebra - Reiny, Tuesday, October 13, 2009 at 5:30pm yes again! Hold on... Looking back on this problem, wouldn't it be x < 18/5 since you need to flip the sign when you divide by a negative?
October 13, 2009 by Anonymous

Mathematics
Since the beginning of satellite radio in 2001, the number of satellite radio subscribers has been growing very quickly. At the end of 2001, the total number of subscribers to XM Satellite radio was 27,733. By the end of 2005, the number of subscribers had grown to 5,932,957. ...
November 6, 2010 by Daisy

Calc
Which rectangular equation corresponds to this set of parametric equations? x = t + 2 and y = t^2 + 3 A. y = (x − 2)^2 − 3 B. y = (x + 2)%2 + 3 C. y = (x − 2)^2 D. y = (x + 2)^2 − 3 E. y = (x − 2)^2 + 3
April 18, 2013 by Chris

intro to algebra
how do i figure out this type of problem. 7(12t). im in college but never learned algebra in high school The seven multiplies by the innards of the parenthesis. 7*12t= 84t
January 16, 2007 by george

Mathematics -- Geometry --
A bowling ball is a solid ball with a spherical surface and diameter 30 cm. To custom fit a bowling ball for each bowler, three holes are drilled in the ball. Bowler Kris has holes drilled that are 8 cm deep and have diameters of 2 cm, 2 cm, and 3 cm. Assuming the three holes ...
February 12, 2013 by Knights

Physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.42105 kg ,its speed is 29.5 m/s,and the net braking force is 4.3*10^5 N. What is its speed 8.33 s later? How far has it traveled in this time? How exactly do I do this? What ...
September 15, 2009 by Mike Rusho

Chemistry
Write the two chemical equations that describe the conversion of magnesium into magnesium oxide. 2Mg(s)+O2(g)->2MgO(s?) First off, would MgO be a solid or gas? And I have no idea what the 2nd equation could be.. Can anyone give me a hint?
October 13, 2009 by Anonymous

Trigonometry
"Sketch the graph of y=tan(x/2) By solving the equation x/2=-pi/2 x=- pi and the equation x/2=pi/2 x=pi..." Before I go any further, I need to understand where these equations came from. Where does the pi come from out of thin air? What becomes of the tangent? Can you please ...
January 24, 2010 by Ellyn

Chemistry
I'm really not getting how to solve these chemical equations. If someone could explain to me their method of solving. I know you have to list the number of reactants and products for each side but I get confused what you add and what determines what you add. Stuff like that. ...
January 25, 2011 by Nick

Chemistry (really need quick help)
Balance the following equations. (Use the lowest possible coefficients. These may be zero.) (a) As(s) + ClO3-(aq) ---> H3AsO3(aq) + HClO(aq) (acidic solution) I am using half-reactions but I dont really get this at all. Can someone explain?
May 5, 2011 by Samantha

Chemistry
Consider the decomposition of a metal oxide to its elements where m represents a generic metal. M2O(s)<->2M(s)+1/2O2(g) the delta G is 10.30 I need to find K and PressureO2 at 298K I know the equations but i keep getting the answer wrong could you please help me. Could ...
July 12, 2013 by Catherine

math
After 8 weeks on a fitness program, Greg weighs 176 pounds. He has been losing an average of 1.25 pounds per week. Write 3 linear equations for this situation, one in each of the three forms. Enter them into a table.
February 18, 2014 by Joji

ALGEBRA
Any one know of free sites where I can use a algebra calculator or download one?
June 8, 2008 by Ann

math 116
Should algebra be taught to everyone? Who should study algebra?
March 20, 2009 by Meshelle

pre-Algebra
Sorry, struggling through pre-Algebra .. :-( .. How do i figure out 5x = -20 ?
February 19, 2010 by Emily

Math
Find a system of linear equations corresponding to the following augmented matrices: (a) 2 0 |0 3 −4 |0 0 1 |1 (b) 3 0 −2 |5 7 1 4 |−3 0 −2 1 |7 (c) 7 2 1 −3 |5 1 2 4 0 |1 (d) 1 0 0 0 |7 0 1 0 0 |−2 0 0 1 0 |3 0 0 0 1 |4
October 25, 2011 by Matt

Univ of Phoenix
Solve the system of equations by graphing. Then classify the system. x+y=9 x-y=3 Use graphing tool to graph the system
December 20, 2011 by Yvette

equations
decide whether each equation is true or false.For each true equation,write the number property shown by the equation.0+6=6
September 4, 2012 by isaac

Algrebra I
1. Which line is the flattest (or is less steep)? Why? y = 5x -6 y = 5x + 6 y = x - 3 y = x + 3 I thought it would be the last one since it has the smallest slope Well, yes...but both the third and last equations have a slope of 1, and so have the same "steepness" (these lines...
October 12, 2006 by Margie

math
can someone show me the steps for this problem because i got it incorrect in my exam. Solve each of the following quadratic equations. 4x^2=13x+12 what i had put was that x is 3/4 and x is -4 but i just got my result back and it was wrong... 4x^2 -13x _12 = 0 (4x+3) (x -4) = 0...
March 1, 2007 by jas20

math
Not sure about this... Need to solve by substitution 8x - 4y = 16 y = 2x -4 Substitute 2x -4 for y in the first equation and solve the resulting equation for x. 8x - 4(2x-4) = 16 16 = 16 The two equations are not independent. One can be derived fron the other. There are an ...
August 8, 2007 by Janna

math
i am really stuck on this application problem in my quadratic equations unit... find the width of a uniform concrete path placed around a 30m by 40m rectangular lawn if the concrete has an area that is 1/4 of the lawn.
December 11, 2008 by garry

math
Can someone check over these problems for me? 1. The width of a rectangle is fixed at 28 cm. What lengths will make the perimeter greater than 70 cm? A: the length must be greater than 7 cm. 2. 7x=-63 A: x=-9 3. Is (-8.-9)a solution of 2x+4y=12 A: No 4. -1/2x=-9/10 A: 9/5 5. ...
January 8, 2009 by deedra

Physics
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....
May 4, 2010 by Katy

Chemistry
Balance each of the following skeleton equations. A) KCl + Pb(NO3)2 -> PbCl2 + KNO3 I balanced it out like this. KCl2 + Pb(NO3)2 -> PbCl2 + 2KNO3 After knowing if I've done this correctly, I'll post on my other questions.
July 11, 2010 by Derrick

AP Physics
A bucket full of water (15kg) is swung in a vertical circle on a rope 1.5m long. What is the minimum speed it can be swung so that the water doesn't fall out at the top? With what was given, which equations do I need to use to solve for V?
November 3, 2010 by Anonymous

Chemistry
The Hydrolysis Reactions - Write net-ionic equations for the reaction of each salt with water below. If there is no reaction, write N.R. 1. NH4C2H3O2 2. NH4Cl 3. NaCl 4. Na2CO3 5. NaC2H3O2 6. NaHSO4 7. FeCl3 8. NaH2PO4 9. NaHCO3
April 30, 2011 by K

math 117
Quadratic equations may be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the pros and cons of each of these methods? When might each method be most appropriate? Which method do you prefer? Explain why.
December 5, 2011 by Anonymous

chemistry
for each of the following equations,calculate the mass of each product formed if 25.0g of the reaction listed first reacts completely with the second.a. 2AgNO3+CaS04=Ag2S04+Ca(No3)2. b. 2AL+GHNO3=2AL(NO3)3+3H2.
March 8, 2012 by SANDRA

PHYSICS
79X190 find (a) the net electrical charge of the nucleus, (b) the number of neutrons, (c) the number of nucleons, (d) the approximate radius of the nucleus, and (e) the nuclear density. I have already determined B and C. I only need to know the equations for A, D, and E Thank you
May 2, 2014 by Nolan

maths
for this simultaneous equations: x + 2y = 1, -x + 5y = 12. would the two solutions be x = -3 and y = 2 sorry i mean -x + 5y = 13 i really need help with my math homework excuse me..does that have anything 2 do wiv my queation?? unless ur dng the same course as me yes, your ...
May 19, 2007 by sarah

calc II
Express the integrals as the sum of partial fractions and evaluate the integral: (integral of) (x^2)dx/(x-1)(x^2 +2x+1) My work: The above integral is equal to x^2dx/(x+1)^2 (A/x-1) + (B/x+1) + (Cx+D)/(x+1)^2 = x^2 A(x+1)^2 + B(x-1)(x+1) + (Cx+d)(x-1) = x^2 Ax^2 + 2Ax + A + Bx...
December 6, 2009 by Jenna

advanced math
what method would be the best if i want to solve more than one ordinary differentials equations? or how would i attack this kind of problem? for example: dy/dt = (1-y)/(1+x+y) dx/dt = (y-x)/[2(1+x+y)] i just need a starting point cause i couldn't think of a way~ :P any help ...
March 5, 2011 by jai

Math
Select any concept from this week.(Linear equations,exponents, Logarithmic problems Write a 350- to 700-word response in which you examine the importance and applicability of this concept. Describe why this concept is important and how it can be applied to society in general
March 29, 2012 by Tiara

math
rewrite each equation as afunction of x.-3y+4y=11 Where are the equations? rewrite this equation as a function of x.-3y+4y=11 y=x
February 23, 2007 by stacy

math
Which of the following equations has the given solution set? Solution set: A)-2m + 5 = 2m + 5 B)-2m + 5 = -2m + 5 C)-2m + 5 = -2m - 5
March 5, 2010 by Anonymous

math
Which of the following equations has the given solution set? Solution set: A)-2m + 5 = 2m + 5 B)-2m + 5 = -2m + 5 C)-2m + 5 = -2m - 5
March 5, 2010 by Anonymous

Pre-Calculus
what is the range of each of these equations? 1. 4sin(3x-1)+4 2. -4sin(-3x+1)-4 3. 2sin(1.5x+.5)+2 4. -2sin(-1.5x-.5)-2
March 17, 2011 by Bethany

Chemistry+Singe replacement
Balance the following equations if the reactions will occur. gold + oxygen Au + O2 --> ??????? barium + oxygen Ba + O2 --> ??? bismuth + oxygen --> Bi + O2 --> ??? help please. keep in mind this is single replacement
February 9, 2009 by Chopsticks

pre-calculus
triangle KLM has vertices K(0,0), L(18,0), and M(6,12). a. Write equations for the altitudes to the three sides of the triangle. b. Show that the altitudes intersect at a single point O, called the orthocenter of the triangle.
August 18, 2009 by natalin

physics
An object with a height of 42 cm is placed 1.6 m in front of a concave mirror with a focal length of 0.45 m. Find the location and magnification of the image produced by the mirror, using the mirror and magnification equations.
May 17, 2010 by Cole

Chem 141
Write the three thermochemical equations needed to calculate the delta H for the below reaction.? 2Mg(s) + O2(g) --------> 2 MgO(s) delta H rxn = ? (Include delta H values in kJ for each reaction)
November 17, 2010 by Barbara

chemistry 1
How do you write balanced equations A. Neutron emission by 88Br B. Electron absorption by 116Sb C. Positron emission by 184Hg D. Alpha emission by 229Th E. Neutron capture by 200Hg
October 25, 2013 by Alexus

Mathematics
Last year Jim's gross weekly pay was $920 and he received $520 in bank interest. HIs taxation deductions totalled $1370. a) Calculate Jim's gross income for last year. b) How much was Jim's taxable income? c) Jim's Medicare levy was 1.5% of his taxable income. HOw much was Jim...
February 10, 2012 by CrissyXD

chemistry
If heat of reaction, Ca(s) + 2H+(aq) Ca2+(aq) + H2(g) , is - 544 kJ/mol, heat of reaction, CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l) , is -192 kJ/mol. and heat of formation of water is -286, what is heat of CaO? i found that the formation of CaO is -638. However, I'm confused about ...
February 11, 2007 by nicholas

Mathematics
An invoice is dated January 24 with terms 2/10 20x. Find the final discount date and the net payment date. The net payment date is 20 days after the final discount date. The final discount date is 2/23. The net payment date is 3/?.
March 8, 2012 by Anonymous

algebra
I need to list some jobs where people use algebra and write how they use it. I know about every job uses it, but I don't know how to find examples. Do you have any guidelines or helpful hints?
April 15, 2008 by Nick

algebra
I am having an extremely tough time with integers in algebra when simplifying algebraic expressions. No matter which method I use I still end up confused and end up with a completely different answer. Ex: 5t-{7t-[4r-3(t-7)]+6r}-4r
February 3, 2010 by marco

Algebra help
m having an extremely tough time with integers in algebra when simplifying algebraic expressions. No matter which method I use I still end up confused and end up with a completely different answer. Ex: 5t-{7t-[4r-3(t-7)]+6r}-4r
February 3, 2010 by marco

Reply to grant about a regression problem
This is a reply to the question posted here http://www.jiskha.com/display.cgi?id=1178989522 As I explained there, you can find the parameters by defining: x1 = Sin(0.49 t) x2 = Cos(0.49 t) and treat this as an ordinary linear regression problem. If we denote the height by Y, ...
May 13, 2007 by Count Iblis

math
Would this be a good resource for my students? This website? Yes, I believe so. We have several people who are very good at helping students with their math homework questions, from elementary school through college levels. Be sure to check out the Mathematics collection, too...
July 15, 2007 by Jo

Physics
A roller coaster cart travelling due north at 20m/s that turns left during an interval of 4.0s without changing speed. Find the average acceleration. I understand the mathematics behind it (using pythagoras's theorem to find velocity and the formula acceleration = velocity/...
March 17, 2013 by Annie

math
I would appreciate any help thanks select two intergers between -12 and +12 write two equations that have the two intergers as solutions. solve the equation using addition/subtraction method
April 16, 2009 by yorkie16

Algebra
I am great at math but for some reason can not wrap my brain around Algebra for the world! Please Help!! Im stumped! Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x 5y = 61 7x 5y = -9
November 17, 2010 by June

Calculus
Find the maximum revenue using the following equations: R(x)=-x^2 +400x and C(x)=x^2+40x+100. What I've done so far is use R(x) and solve for x, which got me 0 and 400. Is that how you're supposed to start it? What happens next? (I apologize; I'm really bad at teaching myself ...
December 7, 2013 by Lindsay

Math - equation of plane and vectors
A plane is defined by the equations x-4y+2z=16. Find two vectors parallel to the plane.
September 4, 2010 by Shaila

Math - equation of plane and vectors
A plane is defined by the equations x-4y+2z=16. Find two vectors parallel to the plane.
September 5, 2010 by Shaila

ma
The only value of b for which the following system of equations in(s,u,z)does not have a unique solution is: b = 3⁢s+3⁢u-z=3 -3⁢s+3⁢u=-3 -3⁢s+b⁢u-z=-3
February 5, 2011 by Tracy

Graphs&Intercepts
Write a sentence comparing the graphs of equations with a positive coefficient of x and graphs with a negeative coefficient of x
October 13, 2011 by Jamal

Chemistry
I just need someone to show me how these problems are done then i can do them myself The Ka values of H2CO3 are shown below. Ka1 4.6 10-7 Ka2 4.4 10-11 What is the pH of a 0.15 M solution of Na2CO3? that one i tried to write out all the equations witht heir Ka then what? how ...
March 8, 2009 by Amy

Chemistry
I was reviewing chem equations online. This one site said this is a balanced equation. I don't see why there are 13 oxygens! thirteen times two would equal 26, and there aren't 26 oxygens on the other side. Who's correct and why? Thank you for your help. 4C2H5F+13O2=>8CO2+...
April 2, 2009 by Meghan

PHYSICS-stuck
These are the troublesome questions. What is the average velocity between 0.6 h and 1 h? A. + 0.4 km/h B. + 1.25 km/h C. + 1.66 km/h D. + 2.5 km/h The other question is below. What is the object's displacemnt between 0.4 h and 0.6 h? A. -0.75 km B. +0.25 km C. +0.75 km D. +1.0...
July 21, 2010 by Anonymous

Differential Equations
A cylindrical tank with length 5 ft and raduis of 3 ft is situated wit its axis horizontal. if a circular bottom hole with a radius of 1 in. is opened and the tank is initially half full of xylene, how long will it ake for the liquid to drain completely? PLEASE HELP
August 31, 2010 by anonymous

Math
Consider a curve lying on the cylinder x^2 + y^2 = 1 and given by the vector function r(t) = (cost,sin t, t^2), for t ≥ 0. Find equations of normal planes at the points (1, 0, 0) and (1, 0, 4π^2) Hi, I don't really know how to start this. I know the formula for a ...
December 7, 2012 by A.

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