Saturday

December 20, 2014

December 20, 2014

Number of results: 37,890

**Differential Equations**

Find the general solution of the differential equation specified. 1) dy/dt= 1/(ty+1+y+1) 2) dy/dx=sec y I got y(x)=arcsin(x) for the second one. I'm not sure what to do with the first one.
*January 22, 2013 by Erica*

**geometry**

The perimeter of a rectangle of two numbers. The sum of the numbers is 163, and their difference is 33. Write two equations that would be used to solve the system
*October 23, 2011 by queen*

**Precalc**

An ellipse has this Cartesian equation: ((x-2)/5)^2 + ((y-4)/3)^2 = 1 Find the focal radius Find the eccentricity Write the parametric equations for the ellipse Transform into the form, Ax^2 + By^2 + Cx + Dy + E = 0
*January 20, 2012 by Grace*

**Calculus 3**

The following parametric equations describe a portion of a shperical surface: x=4cosusinv y=4sinusinv z=4cosv where 0<=u<=pi/4 and 0<=v<=pi/2 Find the surface area of this portion of the sphere.
*March 30, 2013 by Heather*

**Chemistry **

Give the half equations at the anode and cathode for a dilute hydrochloric acid,dilute copper chloride solution and the concentrated magnesium solution.
*May 18, 2014 by Eddie *

**math**

* not multiple choice* 2/3n = 8 solving the system of equations 4x + 3y = 13 y= -x +4 * not sure how to do this the slope intercept form of the function that contains the point (-3, 2) and has a slope of -2? my answer: y= -2x + 6 -1 + 5(6-y) my answer is -y + 29
*December 18, 2014 by Anonymous*

**Mechanics**

In order to find the equilibrium equations in polar coordinates. Page 2 of: (soest.hawaii.edu/martel/Courses/GG703/GG711c_Lec_10.pdf) Do you have to use the Taylor expansion to get from 10.4 to 10.5? Also, how is this equation altered if there are shear stresses?
*September 30, 2007 by Brian*

**Organic Chemistry 51B**

calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
*February 1, 2010 by Anonymous*

**Chem Pre-Lab HELP!**

Write the complete and net ionic equations for the following reactions. Be sure to indicate the states of the reaction products. 1) AgNO3(aq) + NaCl(aq) ----> 2) CaCl2(aq) + Na2SO4(aq) ----> 3) Pb(ClO4)2(aq) + NaOH(ag) ----> 4) (NH4)2SO4(aq) + BaCl2(aq) ---->
*February 23, 2010 by Macey*

**chem**

supose 1.25 mol of N2 and 50.0g of O2 are moxied together. a)which one is the limiting reactant? b) what is the maximum mass in grams of NO2 that can be produced from the mixture? N2(g) + 2O2(g)=2NO2(g) ***please just show me how to set up the equations I would work the ...
*November 9, 2010 by julia*

**Chemisty**

PLEASEHELP i am having a major difficulty finding the answer to this question Give the balanced equation with states for both the cathode and the anode reactions of the electrochemical cell shown. Be sure to include electrons in your equations. Pt(s) l F-(aq) l F2(g) ll Cl-(aq...
*December 2, 2010 by Raffi*

**math**

Still looking at how to solve these... Both are cubic polynomials? 43x^3 + 13x^2 + 18x - 456 = 0 DO I divide first by x-1? 2x(3x+2)^2=312 Honestly: I would graph the equations and find the roots first. I dont see them off hand. graph y=43x^3 + 13x^2 + 18x - 456 and y=2x(3x+2)^...
*January 21, 2007 by mary*

**mathematics**

a person hired a firm to build a cb radio tower. the firm charges $100 for labor for the first 10 feet. after that the cost of the labor for each succeeding 10 feet is $25 more than the preceding 10 feet. that is, the next 10 feet will cost $125 the next 10 feet will cost $150...
*August 20, 2012 by Quita*

**Mathematics**

A machine takes 4.2 hours to make 7 parts. At that rate, how many parts can the machine make in 28.8 hours 48 parts 41 parts 172 parts 17 parts
*November 21, 2012 by Nono*

**Pure Mathematics**

1. Given that the straight line y=c-3x does not intersect the curve xy=3, find the range of values for c. 2. Find the range of values for c for which the line y=cx+6 does not meet the curve 2x^2-xy=3. 3. Find the range of values for k for which 8y=x+2k is a tangent to the ...
*February 9, 2013 by Kerry-Ann*

**math/algebra**

solve each of the following systems by substitution. 16) 5x -2y = -5 y - 5x = 3 20) 8x -4y = 16 y = 2x - 4 28) 4x -12y = 5 -x + 3y = -1 Step one: Solve on of the equations for one of the variables. y=2x-4 Step two:Substitute the expression for the variable found in step one ...
*June 7, 2007 by Diana*

**Mathematics**

Construct a schedule for the amortization of: (a) a debt of $15,000,000 with interest at 12% by 5 equal annual payments. (b) a debt of $25,000,000 with interest at 12.5% compounded semi-annually by making 6 equal semi-annual payments.
*June 22, 2010 by Gibbons*

**Mathematics**

Construct a schedule for the amortization of: (a) a debt of $15,000,000 with interest at 12% by 5 equal annual payments. (b) a debt of $25,000,000 with interest at 12.5% compounded semi-annually by making 6 equal semi-annual payments.
*June 22, 2010 by Gibbons*

**PROBLEM SOLVING IN MATHEMATICS**

you have 13 bags of gold wins. out of 13 bags gold coins, there is one bag gold coins lighter. assume that one real gold coins is 10g and the fake is 9g. now, you are given a electronic beam balance. find the most minimum ways to figure out which bag of gold coins is lighter.
*September 30, 2011 by alya*

**PROBLEM SOLVING IN MATHEMATICS**

you have 13 bags of gold wins. out of 13 bags gold coins, there is one bag gold coins lighter. assume that one real gold coins is 10g and the fake is 9g. now, you are given a electronic beam balance. find the most minimum ways to figure out which bag of gold coins is lighter.
*October 1, 2011 by alya*

**math 116 algebra 1A**

can someon help please. why is it important that you follow the steps rather than solve the problem from left to right?I have no clue. this is my first time taking algebra
*September 17, 2009 by Lea*

**Algebra**

I need help on doing a math problem for my algebra class so if u could help i would be really grateful any way please explain. : Find two consecutive negative integers with the product of 110
*March 24, 2010 by Please help*

**Mathematics of Finance**

Richard borrowed 170000 dollars from his bank to help finance the purchase of a house. The bank charges interest a rate of 8.9 percent per year compounded monthly. Richard has agreed to repay the loan in equal monthly installments over 35 years. a) How much should each payment...
*March 9, 2013 by Lee*

**survey of mathematics**

in a survey of 24 college student,it was found that 16 were taking and english class,17 were taking math class,and 10 were takin both english nad math.how many student were taking a math class only.
*September 3, 2011 by laporisha*

**math**

SYSTEMS OF EQUATIONS CAN BE SOLVED BY GRAPHING OR BY USING SUBSTITUTION OR ELIMINATION. WHA ARE THE PROS AND CONS OF EACH METHOD? WHICH METHOD FO YOU LIKE BEST? WHY? WHAT CIRCUMSTANCES WOULD CAUSE YOU TO USE A DIFFERENT METHOD?
*February 4, 2009 by DAVISHA*

**math,algebra**

Can someone help me set this up to solve or what should i do because i have no clue. thanks. Some scientists believe there is a limit to how long humans can live.* One supporting argument is that during the last century, life expectancy from age 65 has increased more slowly ...
*May 25, 2007 by mathstudent05*

**Maath**

Describe in words the lines having the following parametric equations. Sketch the lines. c) x = -5 y = 2 + t z = 2 + t I don't get this question, please tell me how to retrieve the answer and not just the answer!
*March 19, 2008 by Anonymous*

**Math**

The park ranger is fencing in an area that is 24 ft wide and 36 ft long. The fence posts will be 3 ft apart. How many fence posts will he need? BE SURE TO USE EQUATIONS FOR THIS PROBLEM.
*October 30, 2009 by Ghadah*

**chemistry**

I will be very greatfull to you,if you help me to balance the below equations: 1.)NaOH+S gives rise to Na2S+S2O3+H2O 2.)Al(OH)3+3HCL gives rise to AlCl3+3H2O
*August 28, 2011 by Ramesh Reddy*

**Math**

given f(x)=-2/x-2 +2 determine the equation of the vertical asymptote ' ' ' ' horizontal asymptote 2.find the coordinates of x intercept. 3.' ' ' y ' '. 4.sketch the graph of of f. 5.Determine the equations of the axes of symmetry of f(x)
*March 27, 2012 by Anonymous*

**Science**

A solution of silver nitrate is mixed with a solution of potassium sulphide.Write the molecular,total ionic,and net ionic equations illustrating the reaction.
*November 23, 2012 by Shane*

**Statistics**

According to DeVeaux/Velleman, the best way to succeed in the study of statistics is to memorize definitions and learn equations? True or False I chose True
*August 21, 2013 by Waldo*

**Math 2 questions :/**

Which of the following equations has an infinite number of solutions? 3x ¨C 3 = ¨C4x 2y + 4 ¨C y = 16 7x + 5 = 4x + 5 + 3x 6y ¨C 2 = 2(y ¨C 1) Write the inequality and solve for the following problem: The result of 6 subtracted from a number n is at least 2. n ¨C 2 > 6; n &...
*January 8, 2014 by Princess Anna*

**Math urgent! :( plz help**

3. Which of the following equations has an infinite number of solutions? 3x - 3 + -4x 2y+ 4 -y = 16 7x + 5 = 4x + 5 + 3x 6y -2 =2 (y-1) Write the inequality and solve for the following problem: The result of 6 subtracted from a number n is at least 2 n - 2>6; n > 8 n-6&...
*January 8, 2014 by Princess Anna*

**Pre-Calculus**

Help Please Solve the following system of equations. Round your answers to the nearest tenth. Your answer will be in the form: (M,N). Find M + N, rounded to the nearest tenth. 5x+2y=7 -2x+6y=9
*September 26, 2014 by Anonymous*

**Chem**

Why can't we change subscripts when we balance chemical equations? I don't understand why we can change coefficients but not subscripts. Thanks.
*April 19, 2009 by Em*

**math**

solve each system of equations by substitution. y=3x-9 please help explain how to solve this using substitution.
*May 12, 2009 by eliza*

**Math**

How would you solve the following 2 equations for "X"? x-4(divided by)12=7(divided by3 and 100(divided by)30=4(divided by)3x
*January 23, 2010 by Joy*

**Math**

When graphing two linear equations, what is the significance of the intersection of the two graphs, and if there is no intersection?
*March 18, 2010 by Mark*

**chemistry**

balance the redox equations: IO3-(aq) -> I2(aq) and I-(aq) -> I2(aq) balance the redox equation: S2O3(-2) -> S4O2(2-) and I3- -> I-
*April 17, 2011 by Jake*

**Chemistry **

Are these equations balanced correctly? Zn(s) + 2 Na+(aq) + 2 OH-(aq) + 2 H2O(l) → Zn(OH)42-(aq) + 4 Na+(aq) + H2(g) 2 C3H6(g) + 5 O2(g) → 6 CO2(g) + 8 H2O(l)
*May 29, 2011 by Anonymous*

**Calculus**

Find the points of intersection for y=e^x and y=sin(2x). are there an infamous (sp?) number of points of intersection for these equations?
*August 22, 2011 by katie*

**math**

Solving Equations with Fractions 3m/5 - 1/2 = 7/10 solve for M i need a step my step process. i need help.
*July 12, 2012 by nain*

**Chemistry**

Air Pollution: How do I use equations to describe the question "How is it formed?' for the air pollution?
*January 25, 2014 by Tommy*

**statistics**

At a small college it is known from previous years that 35% of all college freshman start in college algebra. The new freshman class has 100 students in it, What is the probability that between 35 and 42 freshman will start in college algebra? Is it reasonable to approximate ...
*March 23, 2012 by lola*

**math**

Trying to factor 2 equations 3x2+9x-30 4x2-4x-48 I assume you mean 3x² + 9x - 30 which on this board most people write as 3x^2 ... =3(x^2 + 3x - 10) =3(x+5)(x-2) do the same thing for your second question, factor out the 4 first, then it's easy Let me know what you got 4(x-4)(...
*April 18, 2007 by Chris*

**Maths**

I am trying to work through the following equations and can't remember how to do them. I would appreciate if someone could show me how to do both questions so I can see the difference. Find the equation of the line that passes through A(4,-2) and is parallel to 2x-3y=7 A(-2,5...
*March 15, 2008 by Mel*

**Physics**

2.Using the kinematic equations, prove that if two balls are released simultaneously from a table, one with zero velocity and the other with a horizontal velocity Vox, they will both reach the ground at the same time.
*January 9, 2011 by Sean*

**Trig**

How do I prove the following Identity? sec x(sec x-cos x)=tan^2x If there is a certain website or suggestion to help with these type of equations I would greatly appreciate it. I've been studying these for a while but still get pretty confused.
*May 31, 2011 by Mel*

**Math**

What transformation of the complex plane lifts to the rotation of the unit sphere by 180 degrees about the line whose equations are x=y and z=0 in R^3? (three dimensional plane of all reals)(I think thats what that means R^3?) Thank you! Jared
*September 30, 2011 by Jared*

**calculus**

I'm trying to find the intersection point of y=x-2 and y=sqrt(x). I tried letting both equations equal each other but kept coming up with the points (4,1) and (1,4) however these aren't right as the answer should be (4,2) but I am unable to get this answer. Help please?
*February 23, 2012 by Lindsay*

**Polar equations - Help?**

i need to graph the polar equation 2 = r cos (theta + 180) on one of the graphs that looks like a flattened globe. So far I have 2=r cos180 costheta + r sin180 sintheta what do i do now?
*April 20, 2012 by Tabby*

**chemistry**

treatment of a 0.400g sample of impure potassium chloride with an excess of AgNO3 resulted in the formation of 0.733g of AgCl. calculate the percentage of KCl in the sample. show balanced equations in support of your answer
*August 15, 2012 by Andrea*

**Electronics**

Hey. I have been working on some exercises. It all went well until I got to this one. img14.imageshack.us/img14/3300/thev.jpg The transistor in the picture is an NPN transistor. I know the RC value is missing. That’s probably an error, but as long as an appropriate value is ...
*March 31, 2009 by Muuusen*

**mathematics - sinusoidal curves**

The propeller of a boat at dock in the ocean will rise and fall with the waves. On a particularly wavy night, the propeller leaves its resting position and reaches a height of 2m on the peaks of the waves and -2m in the troughs. The time between the peak and the trough is ...
*May 5, 2012 by arnab*

**math**

8. In an interview of 50 math majors, 12 liked calculus and geometry 18 liked calculus but not algebra 4 liked calculus, algebra, and geometry 25 liked calculus 15 liked geometry 10 liked algebra but neither calculus nor geometry 2 liked geometry and algebra but not calculus. ...
*November 30, 2009 by poo*

**Algebra**

Please help to find x, y 1. 8x-y=17 6x+y=11 2. 5x-2y=17 2x+3y=3 Question no.1 8x-y=17 6x+y=11 (adding the equation) __________ (-y and +y will be 0) 14x =28 Taking variables to one side x=28 __ 14 14*2=28 therefore x=2 substitute this value of x in equation 2 6x+y=11 6*2+y=11 ...
*May 18, 2007 by Tamia*

**chem**

okay so i have the answers but i just wanted to see if i was correct Balance these equations..i need the correct answers 1.H2+CL2->HCL 2.Ag+2n->Zn2+Ag 3.Mn4+Cu+->Mn2+ +Cu2+
*June 10, 2008 by amie*

**Pre-Calculus**

Find the rectangular equation of the curve whose parametric equations are x=-2sin t and y=cos t, where 0 less than or equal to tis less than or equal to 2pi. How do I do this??? Thanks for all of your help!!
*September 27, 2008 by Lucy*

**Chemistry **

Balance the equation in aqueous basic solution: NO2-(aq) + Al(s) → NH3(aq) + AlO2-(aq) I know how to balance equations in acidic solutions, but I get lost doing the basic one, please help?
*May 31, 2011 by Jessie *

**Pre-Calculus**

Could you please explain how to use a matrix (matrices) to solve a system of linear equations (two variables)? My book doesn't explain it in a way I can understand. Please and thank you.
*January 24, 2013 by Caroline*

**chemistry**

0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed. (Use your balanced equations above.)
*June 17, 2013 by Annie*

**AP Calculus**

I asked this yesterday and someone answered. but i didn't understand the explanation.. Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I got (x-1)^2+(y-2)^2=16 and (x-4.36)^2+(y+1.36)^2=16
*September 12, 2013 by Sarah*

**writing and linear equations**

the measure of one angle is described as twelve more than four times a number. its supplement is twice as large. find the measure of each angle.
*February 10, 2014 by mari*

**CHEMISTRY**

Determine that which directions ( left or right ) shift , of these following equations according to the Entropy 1) HCl (l) <==> HCl (g) 2) C6H12O6 (aq) <==> C6H12O6 (s) 3) 2NH3 (g) <==> N2(g) + 3H2(g) 4) 3C2h$(g) <==> C6H12 (l)
*July 14, 2014 by MAD*

**Math Question**

Laura was given two points (3,-2) and (-2,4) and was asked to create an equation that represents the line that passes through these points. Write two equations that she could use.
*November 7, 2014 by Kalani*

**Math**

Set up and solve a system of equations to solve the application. A rectangular area of 525 square feet is enclosed using 100 feet of fence. What are the dimensions?
*December 1, 2014 by Ashleigh*

**physics**

An electron and a proton are each placed at rest in an external uniform electric field of magnitude 520 N/C. Calculate the speed of each particle after 48 ns. None of the equations I have seem to help me. What can I use to solve this problem? I figured it out, but thanks anyway.
*April 12, 2007 by Mischa*

**algebra**

Lisa has twice the amount of purses as Sally. If Sally has 6 purses, how many does Lisa have?=6x+6 algebra - Ms. Sue, Tuesday, October 27, 2009 at 5:44pm 2 * 6 = ? algebra - Jarod, Tuesday, October 27, 2009 at 5:59pm Sorry it is 12 so would I 6x2=12 or 6*2=x x=12
*October 27, 2009 by Jarod*

**math**

Use algebra pieces and mental arithmetic to determine four consecutive odd numbers who sum is 64. Sketch and label your algebra piece model and explain how you solved the problem.
*June 2, 2012 by marcus*

**maths**

I am really facing difficulty in maths. I do my best to improve in maths but after entering in the examination hall during my exams, i just get confused. please help The proper name for the subject is mathematics or just "math" for short. Calling it "maths" calls attention to ...
*June 14, 2006 by devendri*

**mathematics**

seeds of type a and b are sold in packets each containing both type a and b seeds at last twice the number of twice b seeds as there are in type a seeds and no more than 12 seeds a) using a scale of 1cm for each unit on both axis draw a graph n the axis to represent the ...
*February 26, 2008 by Keisha*

**Algebra**

A baseball player's batting average is the number of hits the player has divided by the number of at-bats. At the beginning of a game, a player has a batting average of .360. During the game, the player gets 3 hits during 5 at-bats, and his batting average changes to .375. a. ...
*January 16, 2013 by Amie*

**Mathematics**

A Ladder AB, of length 13m, rests against a vertical wall with its foot on a horizontal floor at a distance of 5meters from the wall. When the top of the ladder slips down a distance x meters on the wall, the foot of the ladder moves out x meters. Find x. (I couldn't find this...
*March 5, 2008 by Nazharia*

**math**

For the system of linear equations below, use graphing to determine in which quadrant the solution lies. x+2y=-2 -2x+y=14 Quadrant III Quadrant I Quadrant II Quadrant IV
*April 12, 2014 by sofia*

**Algebra**

ello i need help factoring I haven't had factorin sense Algebra one and now am in Algebra two and our school is screwed up were they shove in a year of Euclidean Geometry and Basic Trig inbetween first two years of Algebra... so i need to factor X^2-12X+35 I can sit there for ...
*December 7, 2008 by Algebra*

**Mathematics and Health**

Equal numbers of people die from heart disease as die from cancer, accidents, and diabetes combined. How would you determine this information from the graph? (The number of people who died from heart disease is 30%. The number of people who died from cancer, accidents, and ...
*November 5, 2013 by Anonymous*

**mathematics**

An equilateral triangle with side length 33 is divided into 332 smaller unit equilateral triangles each with side 1, forming a triangular lattice. We color each segment of length 1 either Red, Blue or Green, subject to the condition that each small unit equilateral triangle ...
*April 30, 2013 by Sambaran G.*

**Math**

Roots Ok, what about roots? Roots of polynomials? Square roots? Cube roots? Terminology, notation, equations using them? Help us out here a little.
*September 5, 2006 by Rorshin*

**Math**

Which of the following are linear equations in x1, x2 and x3? (a) x1 + 5x2 − (2^0.5)x3 =1 (b) x1 + 3x2 + x1.x3 = 2 (c) x1 = −7x2 + 3x3 (d) x1^−2 + x2 + 8x3 =5 (e) x1^3/5 − 2x2 + x3 = 4 (f) πx1 − (2^0.5)x2 + 13x3 = 7^1/3
*October 25, 2011 by Matt*

**math**

(4 − 2x)−2 x=-2 y=4 z=-3 how do you solve this? i have solved it and gotten 6 for my answer many times and it says it's wrong. other equations are (y − z)−3 and (x − 5y)0. i cant get them right
*March 1, 2012 by krysta*

**Trigonometic**

Solving Trigonometic Equations solve for x : ( by radian) 1)cotx= 3 2)secx = 0.5 <<<and thanks >>> 1) Same as tan x = 1/3. Use a calculator. I get 0.321 radians 2) sec x = 0.5 is not possible. The absolute value of the secant must be one or more. << ...
*April 23, 2007 by abdo*

**Chemistry**

OMG i'm soo screw for chem.. >_<ahhh i wonna drop it soo bad!!! PLEASE help me.... AND THANK U!!! Balance redox equations MnO4 - + HCO2H --> Mn^2+ + CO2 K2S3O6 + KClO + KOH --> K2SO4 + KCL + H2O
*September 25, 2007 by saLIna*

**Data Management gr. 12**

I am so confused about correlation equations. I dont know at all how to use them r= W (x-xXy-y)=Sxy __________________ n *the equation doesnt look exactly like this but it is similar, if i can get any help at all that would be great example question:
*April 24, 2010 by Laurie*

**Chemistry**

How much ammonia is produced if 1.80 m3 of hydrogen reacts with 0.5m3 of nitrogen? Also state which reagent is in excess and by how much? Question is related to the Haber process. Please can anyone answer this for me by 02 July 2010. With all equations. Thanx
*June 30, 2010 by Matt*

**Physics**

A 200 g mass attached to a horizontal spring oscillates at a frequency of 2 Hz. At one instant the mass is at x=5 cm and has a Vx=-30 cm/s.Determine: a) the period ( i got T=.5s) b) the amplitude c) the max speed d) the total energy need equations to solve this, please help.
*July 7, 2010 by Sarah*

**Math**

240 m of fencing material is going to be used to enclose three sides of a rectangular lot. What should the dimensions of the lot be so that the enclosed area is as large as possible? (I'm supposed to solve this using a quadratic equations but I don't know how...)
*August 22, 2010 by Avery*

**math**

List advantages and disadvantages comparing and contrasting solving systems of linear equations with two variables by graphing and by equation method. Explain which method you prefer and why. Support your answer by providing appropriate examples
*December 17, 2010 by Anonymous*

**Calc**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y = sin x, y = 0, x = 0 I just need help setting up the formula. So far I got V= the integral from 0 to pi of [(sin²x) - 0²]dx. Is that correct? Thank you so...
*February 1, 2011 by Erica*

**Chemistry**

Use the bond enthalpies and bond energies from the data book in themochemical equations to calculate the reaction enthalpy of:H2(g) + Br2(g) ->2HBr(g) and show your workings in the question above in an energy level diagram.please..
*July 12, 2011 by Gift*

**physics**

Good study tips for physics? I am having trouble understanding the theory and how to apply it into the equations. People have told me I should not just punch in numbers, but I do not know what to do besides that; I treat it like math.
*September 18, 2011 by Daniel*

**chemistry 105**

Complete and balance each of the following equations, some may have no reactions. NaNO3(aq)+KCl(aq)--> NaCl(aq)+Hg2(C2H3O2)2(aq)--> note that Hg(I)^+1 interacts with another Hg(I)^+1 ion to produce the cation Hg2^2+ (NH4)2SO4(aq)+CuCl2(aq)-->
*October 10, 2011 by julie*

**calculus**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. (Round your answer to three decimal places.) y = e^−x y=0 x=0 x=7 I got the answer ~10.783 Idk why it's wrong
*January 22, 2012 by NAN*

**Calculus**

Can someone explain this question to me? What intervals should I use to test whether or not the graph is concave up or down. I know that no points or equations are given so we have to estimate. Here is the URL for the graph. imgur dotcom/FdQCV
*March 3, 2012 by Jake*

**Chemistry**

How to calculate Q in Nernst Equations, we used 0.10M solutions in all of our half cells. Nernst equation: Ecell = E0cell - RT/nF ln Q Overall reactions: Cu(s) + Pb2+(aq) ~ Cu2+(aq) + Pb(s) and 3Pb(s) + 2Al3+ ~ 3Pb2+ 2Al(s) Thank you!
*May 14, 2013 by Chloe*

**Math: Differential Equations**

I'm given y''= sin(x) with the initial conditions of y(0)=0 and y'(0)=2. I've already taken the integral two times to get an answer of y= -sin(x)+3x, however, I'm stuck as to how to make this equation in terms of x=... Please explain, I'd really appreciate it!
*January 14, 2014 by Student*

**chemistry urgent**

I think I balanced these equation right please check and let me know. i am suppose to complete and balance the equations representing the reactions. NaHCO3 (s) + HCL (aq) >>>> NaCl + 2CO+H2O CaCo3 (s) + HCL (aq)>>> CaCl + CO3H Thanks
*April 23, 2014 by jazz*

**Business Mathematics**

In finance department of a certain company, there are twice as many men as women and in the marketing department there are ten more men than women. The number of women in both departments is the same and there are two more workers in finance department compared to marketing ...
*April 20, 2011 by Ally*

**Plz Check My Geometry**

Out of 30 questions these few I struggled with. I put what I feel was right but to be sure I would like some one to check my answers and if there wrong redirect me on how to get the correct answer.( after the = is the answer i think it is. 1.) Given points A(-4, 5), B(2, 3), C...
*June 9, 2010 by Ariel*

**Plz Check My Geometry**

Out of 30 questions these few I struggled with. I put what I feel was right but to be sure I would like some one to check my answers and if there wrong redirect me on how to get the correct answer.( after the = is the answer i think it is. 1.) Given points A(-4, 5), B(2, 3), C...
*June 9, 2010 by Ariel*

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