Thursday

April 17, 2014

April 17, 2014

Number of results: 1,753

**Calculus 2**

Evalute the integral of x/(x^2+4)dx using u-substitution and then trigonometric substitution. I did this and got (1/2)ln(x^2+4)+C using u-substitution and x^2+4+C using trigonometric substitution. What did I do wrong??? thank you for helping!
*Wednesday, October 10, 2012 at 6:54pm by Heather*

**Trigonometric Substitution**

Trigonometric Substitution a. Explain why the substitution x = asin(Theta) guarantees that cos(Theta) is greater than or equal to 0 . b. What sort of restriction must we put on x and a so that the substitution x = asec(Theta)will guarantee that tan(Theta) is greater than or ...
*Tuesday, June 28, 2011 at 1:51pm by John*

**calculus**

Integrate x/(x^2 + 4) dx via trig substitution and by u=x^2+4 substitution. Show that results are equal. Via trig substitution of x=2 *tan t, I get: 1/2 * tan^-1 (x/2) + c Via u = (x^2 + 4) substitution, I get: 1/2 * ln |x^2 + 4| + c How are these equal?
*Monday, December 31, 2007 at 3:52pm by mathstudent*

**Calculus**

It took me your trig substitution followed by a u substitution to get 93squrt(x^2+9)/9x+C
*Friday, November 30, 2012 at 8:32pm by Jason*

**substitution **

solve by the substitution method 3x+5y=21 x=51-9y
*Tuesday, October 12, 2010 at 7:56pm by Sam*

**substitution **

solve by the substitution method 3x+5y=21 x=51-9y
*Tuesday, October 12, 2010 at 8:01pm by Sam*

**math**

ok, i just don't get the whole problem: Solve this system using substitution. Check your substitution. C(n)=-3n-6 C(n)=n-4
*Wednesday, April 1, 2009 at 7:29pm by Angie*

**Algebra**

Oh sorry, i just realized it said to use substitution and I used elimination. I forgot how to do substitution.
*Saturday, April 24, 2010 at 12:01am by jen*

**math**

Use the substitution u=sin(t) du=cos(t)dt and don't forget the factor (1/5) when you do the second substitution v=(5u+8)
*Sunday, November 29, 2009 at 4:29pm by MathMate*

**algebra**

i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations by substitution. x^2 + y^2 = 25 x - y = 7 3) ...
*Tuesday, April 5, 2011 at 10:27am by Alyssa*

**Algebra 1**

I used substitution. Why don't you try substitution on the last set of equations? I'll be glad to check your answer. To start you off -- x = 12 - 4y
*Monday, April 8, 2013 at 7:37pm by Ms. Sue*

**Algebraic Systems**

i always used substitution..cuz like you, i got confused quicker with elimination.and substitution took me a much longer time, but i could be sure of my answer :)
*Sunday, January 25, 2009 at 7:19pm by y912f*

**math substitution method**

use the substitution method to solve 7x+5y=-26 x=28-6y
*Sunday, March 28, 2010 at 12:04pm by KiKi*

**math substitution method**

solve by using the substitution method. 5x-3y=-25 4x+34=y
*Sunday, March 28, 2010 at 12:04pm by Shell*

**math**

solve each system of equations by substitution. y=3x-9 please help explain how to solve this using substitution.
*Tuesday, May 12, 2009 at 8:00pm by eliza*

**substitution**

i need help with substitution
*Monday, February 18, 2008 at 8:17pm by dexandra*

**algebra**

use the Substitution Method. Please give it a try. y = 3x + 4 5x + 3y = 12 Why is the substitution method preferred in this case?
*Tuesday, April 5, 2011 at 8:19pm by Maya*

**Algerbra 1 substitution method**

im really confused about this question: 2x-3y=21 y=3-x using substitution method. please help
*Tuesday, January 31, 2012 at 10:32pm by Austin *

**Calculus**

Obtain the MacLaurin series for 1/(2-x) by making an appropriate substitution into the MacLaurin series for 1/(1-x). ------------ The MacLaurin series for 1/(1-x) = Σ x^k I substitue (x-1) in for x, because 1/(2-x) = 1/(1-(x-1)) Making the same substitution in the ...
*Thursday, June 25, 2009 at 7:55pm by Sean*

**Algebra II**

Use synthetic substitution to find f(-3) for f(x) = 2x^3 - 6x^2 - 5x + 7. _3|2 -6 -5 7 6 36 93 ______________ 2 0 31|100 then I used direct substitution and just plugged -3 in for x and the final answer is f(-3) = 86
*Monday, March 3, 2008 at 3:16pm by Jon*

**Algebra**

Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your work! (I can'tfigure out how to graph it and when i used substitution and elimination it came out with two different anwsers. I got (13/3.5,19/10.5) for substitution, and ((0.2,-0.8) for Elimination.I need ...
*Monday, January 17, 2011 at 2:11pm by Darryl*

**calculus**

We're doing indefinite integrals using the substitution rule right now in class. The problem: (integral of) (e^6x)csc(e^6x)cot(e^6x)dx I am calling 'u' my substitution variable. I feel like I've tried every possible substitution, but I still haven't found the right one. The ...
*Saturday, May 2, 2009 at 4:14pm by Joshua*

**Pre-Calc**

You solve for diameter after putting in for height (area/2pi(dia/2)^2 into the Area equation. It is called substitution, having two equations and solving it by substitution.
*Friday, November 13, 2009 at 9:46pm by bobpursley*

**calculus**

Decide on what substitution to use, and then evaluate the given integral using a substitution. HINT [See Example 1.] (Round your decimal coefficients to four decimal places.) x/(2x^2-1)^0.4 dx
*Monday, May 2, 2011 at 4:50am by patrick*

**Geometry**

Substitution Property of Equality: If a=20, then 5a= _____. The substitution rule states that If a=b then a can be substituted for b in any equation or expression. So I think that 5a=5b but the number answer is 100. Am I correct?
*Wednesday, October 2, 2013 at 7:40pm by David*

**Substitution Method-Plz help**

To solve the system given below using substitution, it is best to start by solving the first equation for y. 11x + y = 12 9y + 3x = 7 can you please explain please :)
*Tuesday, October 17, 2006 at 3:34pm by Anonymous*

**Substitution Method in Algebra!HELP PLZ!**

i need help on substitution method
*Sunday, November 5, 2006 at 5:54pm by susssie*

**Math**

1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system. Help please. The only reasons I can think of is because in substitution it might be more difficult cause there's a possibility of working with fractions.
*Monday, February 18, 2008 at 9:52pm by Amanda*

**Brief Calculus**

Decide on what substitution to use, and then evaluate the given integral using a substitution. HINT [See Example 1.] (Round your decimal coefficients to four decimal places.) x/(2x^2 − 1)^0.4 dx
*Monday, May 2, 2011 at 4:57am by Ashley*

**substitution method**

solve using the substitution method 8x -9y= -95 5x+64=y The solution is (___,___)
*Tuesday, July 20, 2010 at 12:24pm by upbeat*

**substitution method**

solve using the substitution method 6x+2y=-14 -5x+y=25 The solution is (___,___)
*Tuesday, July 20, 2010 at 12:43pm by upbeat*

**Math**

Solve this system of equations by substitution or elimination. Substitution would probably be easiest. Simply solve for b in the first equation and substitute that into the second equation.
*Tuesday, November 27, 2007 at 9:11pm by Michael*

**substitution method**

solve using the substitution method 8x+6y=8 -9x+y=22 The solution is (___,___)
*Tuesday, July 20, 2010 at 12:45pm by upbeat*

**Algebra**

If one of the equation is in the form y = .... or x = .... , or can easily be changed to one of those forms, I would use substitution e.g 3x + 4y = 36 y = 2x+3 definitely use substitution
*Monday, January 28, 2013 at 3:38pm by Reiny*

**algebra 1**

Whether to use substitution or elimination becomes a judgement call. Sometimes one is easier, at other times not. e.g. 2x + y = 15 3x +7y = 12 In this case , change the first to y = 15-2x and use substution, clearly easier e.g 3x + 5y = 9 4x - 3y = 20 Here I would NOT use ...
*Monday, January 21, 2013 at 3:53pm by Reiny*

**substitution method**

solve by the substitution method 2m+n=9 m-6n=50 the solution is (___,___)
*Tuesday, July 20, 2010 at 12:35pm by upbeat*

**math/ elimination& substitution**

how do i solve this? using elimination or substitution? 2x-3y=-1/12 y=-x+7/12
*Thursday, May 16, 2013 at 4:20pm by Keyshia*

**O.Chem**

Only a substitution product is obtained when the compound 1-bromo-2,6-dimethylcyclohexane is treated with sodium methoxide. Draw the substitution product and explain why an elimination product is not obtained.
*Sunday, November 21, 2010 at 8:42pm by Lily*

**calculus -- PLEASE HELP!**

Suppose you are trying to evaluate the intergral 2x^3dx and you make the substitution u=x^2. The substitution takes one area and converts it to a different one-in this case a trapezoid with vertical sides. Denote by R the region under the first curve from 3 to 3.01 and ...
*Wednesday, January 30, 2008 at 10:03pm by anonymous*

**Algebraic Systems**

Okay i just wanna know what you think is the easiest between substitution and elimination/combination. I hate elimaination becuase i get confused quicker with this when actually solving it than in substitution, but it's actually easier for me. Still, substitution is what i ...
*Sunday, January 25, 2009 at 7:19pm by <3Medic+Droid<3*

**Math**

Calculate the integrals by partial fractions and using the indicated substitution. Show the results you get are the same. dx/1-x^2; substitution x= sin pheta I understand how to do the partial fraction part, but not the second part and I dont know how they are similar. Any ...
*Monday, February 25, 2008 at 3:52am by Jessica*

**calculus**

Help with an integration question with the substitution given? Please help, i tried to to answer it but the working is too complicated can anyone help out there, the question says: Using substitution 5x=4cosØ to show ∫ √ (16-25x^2) dx = 4 π + 6√ 3 / 15
*Saturday, September 22, 2012 at 4:49pm by Fatima*

**algebra 1**

I was just wondering if anybody could explain to me the steps in 'solving systems in substitution' and 'solving systems in substitution with a variable'. I'm majorly confuzled!!!! It might help to post a specific problem so someone can show you the steps.
*Wednesday, March 7, 2007 at 5:38pm by Otoño*

**math**

int 1/ (sq rt (4sec^2 x +4)) dx trigonometric substitution expression: sq rt (x^2-a^2) substitution: x=a sec x identity: sec^2 x -1=tan^2 x
*Thursday, March 4, 2010 at 8:25pm by maggie*

**Math**

12x+4y= 22 and 3x-8y= -10 What are the coordinates of x and y? Use the Substitution Method. ---and--- -5x+7y= -41 and 7x+y=25 What are the coordinates of x and y? Use the Substitution Method. Please help!!! =DDD
*Friday, January 25, 2008 at 9:27pm by Catherine*

**Calculus/Substitution**

The integral from 1 to 2 of x*the square root of (x-1) dx. Using the substitution method, I said that u = x-1, du = 1 dx, and dx = du. I'm not sure how to plug u back into the equation since I still have that first x. Suggestions are greatly appreciated.
*Sunday, July 12, 2009 at 2:51pm by Amy*

**calculus**

do you do u substitution for each or automatically trig substitution. Because when you do trig sub you get 0 but when you do u sub then you get pi/4
*Thursday, March 4, 2010 at 2:03am by Dana*

**Chemistry**

I was wondering if anyone could describe a general Friedel-Crafts alkylation to me. I understand that it involves the substitution of an aromatic ring with an alkyl group using a strong Lewis acid catalyst. But, what types of activating groups are present on the ring? What's ...
*Thursday, March 1, 2012 at 4:58pm by Jenny*

**organic chemistry**

How can gas chromatography determine what mechanism a reaction underwent? For example, I was to synthesize an alkyl halide using 1-propanol, NaBr, and sulfuric acid. I know its a substitution reaction, but how can gas chromatography tell me whether its SN1 or SN2 substitution?
*Monday, April 20, 2009 at 3:09am by needhelpwithchem*

**chemistry**

What will be the fastest reaction if a strong base, such as sodamide, reacts with a secondary alcohol, such as (2S)-butanol? a) deprotonation of the alcohol b) substitution with racemization of stereochemistry c) elimination to form the more substituted alkene d) substitution ...
*Friday, March 29, 2013 at 12:10pm by michelle*

**Substitution Method-Plz help**

Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get it.How did you get that?What does x equal? re read...
*Tuesday, October 17, 2006 at 3:34pm by Svetlana*

**Algebra**

Mathematical solutions to systems of equations are more accurate than graphical solutions; because when the point of interception fall between grid lines, you must estimate the point location. Which is easier the elimination method or the substitution method? Well, it depends ...
*Thursday, June 10, 2010 at 10:23pm by Henry*

**Linear Equations**

Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve the systems of equations by the substitution ...
*Tuesday, March 2, 2010 at 1:04pm by Mia*

**Microeconomics**

1. The utility function is given by: U=x+y and the budget line is x+2y=100. Then the price of good x goes up to 4. Find the Hicksian substitution effect, income effect, and total change in demand for good x from the change --- Ok i read the theory but i cant solve the problem ...
*Tuesday, November 28, 2006 at 1:56am by Andrew*

**Geometry HELP!!**

I need help with my geometry hw, i need to now wat the properties are for the following statements. 1. If 2x=6, then x=3 2. If 42 degrees + measure of angle 2 = 90 degrees, then measure of angle 2 = 48 degrees 3. If measure of angle D = 40 degrees and measure of E = 90 degrees...
*Wednesday, November 11, 2009 at 5:00pm by Anonymous*

**geometry**

ughh i need help i dnt like proofs we'll here it the instructions write a two column proof the segment addition postulate is useful for this proof also. remember that the transitive && substitution properties are common in proofs this one requires substitution.. given is rs=xy...
*Thursday, September 24, 2009 at 11:02pm by samm*

**Algebra - solving linear equations w/ substitution**

The question in the book reads: "Suppose you try to solve a system of linear equations using substitution and get this result. How many solutions does each system have?" 1)x=-2 2)y=12 3)6=x 4)-8=-8 5)7=y 6)5=3 I understand #3 and #6, but I do not understand how to know how ...
*Monday, March 19, 2007 at 6:21pm by Samantha*

**chemistry**

carboxylic acid plus alcohol yields ester plus water. It is an organic substitution reaction wot type of reaction is this CH3CO2H + C6H5CH2OH---------------> CH3COOCH2C6H5 + water is it like a substitution or like an addition or wot?
*Tuesday, December 19, 2006 at 9:00am by bobpursley*

**Algebra 1**

I will give you the substitution method for b. Then you do a and c B. substitution method 7x -3y = 20 7 x = 3 y + 20 x = (3/7)y + 20/7 then 5x +3y = 16 5[ (3/7)y + 20/7 ] + 3 y = 16 (15/7)y + 100/7 + 21/7 y = 112/7 36 y = 12 y = 1/3 go back and get x
*Thursday, December 12, 2013 at 1:04pm by Damon*

**11th grade - Math**

(Broken Link Removed) http://www.freemathhelp.com/substitution.html
*Monday, November 3, 2008 at 9:12pm by Ms. Sue*

**Substitution Method**

Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 x + y = -4 x - y = 2 In the second equation, x= y+2 Putting that in the first.. (y+2) + y= -4 subtract two from each side, then divide each side by two to get y. Then, put that value of y into ...
*Monday, October 16, 2006 at 4:38pm by Margie*

**algebra**

it all depends upon the equations in question: if equations are VERY straight forward then the graphing method can work well. It has the advantage of visualation. In other words, you can see the behaviour of the system. Main drawback to graphing is it isnt very accurate for ...
*Tuesday, January 26, 2010 at 7:41pm by richika*

**Math**

You can use elimination to solve this one, but the coefficients are ideal for a substitution. Add the first two equation, you will end up with 3x=9, or x=3. substitute x into the second & third equations and add, you will get y=-2. Substitute x=3 and y=-2 into the third ...
*Saturday, July 25, 2009 at 12:33pm by MathMate*

**calculus-integration!**

should i use substitution?? if yes how should should i use it? plz i need some directions? k plz someone?...so far i used trig. substitution. i got a=8, so i used x=asin(è)so according to this substitution i got x=8sin(è) and dx=8cos(è) dè...then i used used the plug them in ...
*Sunday, May 6, 2007 at 4:25pm by Maria*

**Economic**

A Giffin good is not correctly described by which of the following? A)A Giffin good must be an inferior good. B)A Giffin good must be such that the income effect and the substitution effect move in opposite directions, and the income effect outweighs the substitution effect. C...
*Sunday, April 11, 2010 at 9:38pm by Dina*

**calculus**

Assuming that: Definite Integral of e^(-x^2) dx over [0,infinity] = sqrt(pi)/2 Solve for Definite Integral of e^(-ax^2) dx over [-infinity,infinity] I don't know how to approach the new "a" term. I can't use u-substitution, integration by parts, partial fractions, or trig ...
*Monday, January 14, 2008 at 1:46pm by mathstudent*

**Calculus**

Your antiderivative is not correct. You need a u substitution. Or if you have not learned that try NINT in the calculator. For the u substitution, let u = cos x and du=-sinx . (this is after you changed the integral to sin^3x = sin^2x *sinx =(1-cos^2x)(-sinx). Don't forget the...
*Monday, January 11, 2010 at 8:29pm by Anastasios*

**Math-Algebra**

Solve: 3x-2y=10 2x+3y=-2 Graph: Substitution: Elimination: Show Your work! (I can'tfigure out how to graph it and when i used substitution and elimination it came out with two different anwsers. I need help! and i need to be able to show my work!)
*Monday, January 17, 2011 at 2:08pm by Darryl*

**substitution method**

Solve by substitution method please help me solve this. I do not know how to do this at all. The question is 3x+8y=33 and x=31-6y I know that I have to plug x into the first x like 3(31-6y)+ 8y = 33 but i do not know what to do from there.
*Wednesday, October 27, 2010 at 9:23pm by anonymous *

**algebra**

Rather than substitution, why don't we just subtract them as they stand. -29y = 0 y = 0 then 3x = -12 x = -4 If you really have to use substitution, form the first , 3x = 15y - 12 into the 2nd 15y - 12 + 24y = -12 29y = 0 then 3x = 15(0) - 12 3x = -12 x = -4
*Monday, November 14, 2011 at 4:32pm by Reiny*

**MATH**

Useing substitution/elimination method what is the solution set to 2x+y=1 x^2=y+2 a)(-3,7) and (1,-1) b)(3,7) and (-1,-1) c)(-3,-7) and (1,1) d)(3,-7) and (-1,1) I've really no educated guess so PLEASE HELP! You can make an educated guess by substituting the various (x,y) ...
*Tuesday, January 16, 2007 at 11:42pm by Anonymous*

**Alg-Substitution (check plz)**

k well i had to use substitution to find the point of intersection for these 2 equations x-y=10 3x+y=11 i chose to substitute y in the first equation my final answer was (-1/2 , 5) can someone clarify this, and if it's wrong, where'd i make a mistake? In the first equation, y...
*Thursday, February 22, 2007 at 8:30pm by thomas*

**algebra**

You can set up the equations as follows: B=5A C=4A-9 A+B+C=180 (sum of angles of a triangle). and solve for A, B and C. However, you can easily solve it by substitution into the third equation: A+B+C=180 A + 5A + 4A-9 = 180 10A=189 A=18.9 With A known, you can then find the ...
*Friday, February 17, 2012 at 5:52pm by MathMate*

**biology**

Make a single base pair substitution mutation in the gene below that results in a protein that is shorter than the protein produce by the original gene. When you are satisfied with your change and its effect, click the "Final Check" button. Note that a "single base pair ...
*Monday, November 18, 2013 at 10:19am by juanpro*

**calculus**

(Integral of) cos x^(1/2) dx Do the substitution part first. Let x^(1/2) = y x = y^2 dx = 2y du So the integral becomes, after substitution 2*(Integral of)y cos y dy Now use integration by parts. You may have to use it twice. You should end up with 2 cos y + y sin y Then ...
*Monday, January 21, 2008 at 7:49pm by drwls*

**macroeconomics**

(Import Substitution Versus Export Promotion) Explain why domestic producers who supply a good that competes with imports would prefer an import-substitution approach to trade policy rather than an export- promotion approach. Which policy would domestic consumers prefer and why?
*Monday, December 21, 2009 at 4:40pm by Amber*

**microeconomics**

How the technical rate of substitution and marginal product are related and what is their difference? i only wrote their definitions The technical rate of substitution measures the rate which the firm has to substitute one input for another, for keeping the output stable. It ...
*Friday, December 21, 2012 at 4:22am by liza*

**Algebra help!**

Please help and I would appreciate an explanation as to how you got to the answer. 1.) Solve the system by triangularizing the augmented matrix and using back substitution. 0.09x-0.15y+0.39 -0.18x+0.35y=-0.88 2.) Solve the system by triangularizing the augmented matrix and ...
*Wednesday, March 27, 2013 at 9:36pm by Kristen*

**Math please help!!**

Rewrite your system: y+2x=5 3y+x= -5 2x+y=5 x+3y= -5 In google type: solve system substitution When you see list of results click on: SolverSOLVE linear system by SUBSTITUTION When page be open in first roow type 2x+1y=5 In second roow type: 1x+3y= -5 and clic option Solve You...
*Monday, February 28, 2011 at 6:34pm by Anonymous*

**Bio**

a) Make a single base pair substitution mutation in the gene below that results in a mature mRNA that is shorter than the mature mRNA produced by the original gene. When you are satisfied with your change and its effect, click the "Final Check" button. Note that a "single base...
*Tuesday, May 14, 2013 at 6:58am by Amos Amines*

**Alegbra**

Set up two equations a = adults c = children 70a + 40c = 27750 a + c = 450 Solve by substitution or elimination Substitution: 70a + 40c = 27750 a = 450 - c Elimination: 70a + 40c = 27750 -70(a + c) = -70(450)
*Thursday, February 27, 2014 at 1:33am by Chelle*

**microeconomics**

Fact 1: "The substitution effect(SE) must ALWAYS be negative (i.e. goes in the opposite direction to the change in PRICE). The income effect(IE) can be either positive or negative." Fact 2: "SE and IE can go in the same direction or they can go in opposite directions...
*Sunday, October 18, 2009 at 3:20am by Victor*

**math**

Note: You can get full credit for this problem by just answering the last question correctly. The initial questions are meant as hints towards the final answer and also allow you the opportunity to get partial credit. Consider the definite integral from pi/6 to pi/2 cos(z)/...
*Saturday, January 25, 2014 at 4:38am by kitor*

**Plz Check my math..**

1. Elimination. 2. 7x + 5y = 19 -7x - 2y =-16 Sum: 3y = 3 Y = 1. In Eq1, replay Y with 1: 7x + 5*1 = 19 7x = 14 X = 2 Ans: (2,1). 3. Substitution. 4. Use substitution. 3x + 2*(-3x) = 6 5. m1 = -A/B = 3/6 = 1/2. m2 = 3/6 = 1/2. No solutions, because the lines are parallel and ...
*Wednesday, December 11, 2013 at 11:24am by Henry *

**algebra**

You can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/. For "math substitution method," I found: http://www.google.com/search?client=safari&rls=en&q=math+substitution+method&ie=...
*Tuesday, January 26, 2010 at 7:41pm by PsyDAG*

**Algebra help!**

1.) Solve the system by triangularizing the augmented matrix and using back substitution. -x-y+z=1 x-y-4z=-7 4x+y+z=6 2.) Perform the indicated row operation, then write the new matrix. -4 4 | 4 9 -6 | 5 -2R1+ R2 ---> R2 3.) Solve the system by triangularizing the augmented...
*Thursday, March 28, 2013 at 7:42am by Becca*

**math**

Michael has a total of $2000 on deposit with two saving institutions. One pays interest at the rate of 6% per year whereas the other pays interest at a rate of 8% per year. If Michael earned a total of $144 in interest during a single year, how much did he deposit in each ...
*Monday, May 16, 2011 at 7:23am by SUBSTITUTION METHOD*

**Algebra**

I have a few questions I need help with! 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter. -3x+y-z=-4 6x-2y+2z=8 -12x+4y-4z=-16 2. Solve the system by ...
*Wednesday, March 27, 2013 at 9:39pm by Kristen*

**Calculus - please help!**

we have 4x^2 + 9y^2 = 36 The line x=3 lies at one end of the ellipse, so shells are probably the way to go. The volume v is thus v = ∫[-3,3] 2πrh dx where r = 3-x and h = y = √(36-4x^2)/3 v = 2π/3 ∫[-3,3] (3-x)√(36-4x^2) dx Now just break it ...
*Friday, October 11, 2013 at 12:02pm by Steve*

**Algebra help needed please!!**

I have a few questions I need help with! 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter. -3x+y-z=-4 6x-2y+2z=8 -12x+4y-4z=-16 2. Solve the system by ...
*Thursday, March 28, 2013 at 7:38am by Kris*

**ECON**

PLEASE CHECK AND CORRECT MY ANSWERS!!!! MRTS = marginal rate of technical substitution RTS = returns to scale MP = marginal product Suppose the production function is Cobb-Douglas and f(x1, x2) = [x1^(1/2)][x2^(3/2)]. (Note: x1 and x2 are variables). a) Select an expression ...
*Wednesday, October 14, 2009 at 8:41pm by Anonymous*

**Alegbra**

d = dimes q = quarters Equations: 10d + 25q = 285 d + q = 15 Solve by substitution or elimination Substitution: 10d + 25q = 285 d = 15 - q Elimination: 10d + 25q = 285 -10(d + q) = -10(15)
*Thursday, February 27, 2014 at 1:32am by Chelle*

**algebra 1**

3) for any factorable trinomial x^2+bx+c, will the absolute value of b sometimes,always, or never be less than the absolute value of c? explain idk 4) give an example of a trinomial that can be factored using the factoring techniques presented. then factor the trinomial. idk 5...
*Wednesday, April 17, 2013 at 7:51pm by hi*

**Macroeconomics**

For convenience, let c= $15 of consumption. (Dont worry, you would get the same answer if c=$1 of consumption) So, your equations are: Max(U)=2*ln(c)+ln(L) subject to: c+L=120 To get one L,the person must give up one c. So the price of L in terms of C is 1. Soooooo, we want ...
*Saturday, May 24, 2008 at 3:02pm by economyst*

**Chemistry**

I believe the nucleophile is the alcohol (more specifically, the O of the alcohol). See here. http://www.organic-chemistry.org/namedreactions/nucleophilic-substitution-sn1-sn2.shtm
*Tuesday, July 14, 2009 at 10:53pm by DrBob222*

**geometry**

Substitution
*Wednesday, October 3, 2007 at 10:34pm by Yqyx*

**math**

substitution
*Sunday, December 12, 2010 at 8:41pm by Nick*

**Math**

Substitution.
*Thursday, July 4, 2013 at 12:50am by Henry *

**Math**

Substitution.
*Thursday, July 4, 2013 at 12:52am by Henry *

**Math help**

It's substitution
*Thursday, January 30, 2014 at 4:18pm by Anonymous*

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