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July 5, 2015

Search: mathematics: algebra;equations

Number of results: 40,033

algebra 1
find a value for k that will make 4x^2 + 6.4x + k a perfect square. describe the procedure that you used which requires algebra. I have the answer and it is k = 1.6^2 or 2.56 i just don't get how we got there
March 4, 2009 by Dippy

Math (Algebra/Pre-Algebra)
What is the 23rd term in the arithmetic sequence: 11, 14, 17, 20...? All I need is the formula to find the it because I have to show work. Thanks.
June 4, 2009 by Samantha

Algebra
Hello, I am having a bit of trouble with two Algebra questions 1. Solve x= 8x - over the domain [0, 2, 4, 6] 2. For what values of a is the equation /a/ =5 true? Thanks in advance.
December 27, 2009 by Tamir

Algebra
First, I really stink @ Algebra. How do combination of signed numbers work? I keeping getting 6 but for some reason I don't think its right. -1-(-6+-1) -1-6+1 -5+1=6
March 20, 2011 by Jeannie

algebra 2
So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)
November 10, 2013 by Alyssa

algebra 2
So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)
November 10, 2013 by Alyssa

Physics(Please answer, thank you)
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values. Physics - drwls, Saturday, September 15, 2012 at 1:29am Define your terms. I have no idea what you are talking...
September 15, 2012 by Hannah

algebra 1 help
fin the complement and the supplemnt of the angel measure 1) 130 complement-40 suplement-50 or vice versa if anyone can help me with some algebra work it would be greatly appreciated i am im algebra 1 and still on the second quarter and have until november to finsh thank you ...
August 20, 2005 by cristina

Discrete Mathematics
Mathematical sequences can be used to model real life applications. Suppose you want to construct a movie theater in your town. The number of seats in each row can be modeled by the formula C_n = 16 + 4n, when n refers to the nth row, and you need 50 rows of seats. (a) Write ...
September 4, 2012 by sara

Mathematics
Two readings are taken from an aircraft's flight record Time - 08:55 Distance travelled - 957 Time - 09:07 Distance travelled -1083 For the period of time between the two readings, how do i calculate a)the distance travelled in kilometres and b)the average speed of the ...
June 15, 2009 by Nick

math-rational equations
how do I solve 5/x-3+3/x+3=7x/x^2-9 please explain in detail, I am having trouble once I get to the part where I need to simplify. I have so far the LCD is x^2-9 then the equation changes to (x^2-9) 5/x-3+(x^2-9) 3/x+3=(x^2-9) 7x/x^2-9 or (x+3)*5(x-3)*3=7x after this I'm stuck...
July 1, 2009 by Kay

Pre-Calculus
Find the values of x for which the line y=2x intersects the parabola y=(x-1)^2+1. So I set the equations equal to eachother, and solved for x using the quadratic formula. The solution I got was: x=3.41 and x=0.59. Could someone please check my work.
September 20, 2010 by Jon

chemistry
for the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluable salt. KCl, BaCl2, AgNO3, Pb(NO3)2, K2SO4, HNO3
October 28, 2011 by carly

Chemistry
For the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluble salt. KCl, BaCl2, AgNO3, Pb(No3)2, K2SO4, HNO3
November 2, 2011 by Helen

chemistry
Balance each of the following redox equations using the half-reaction method. HI(s) + H2SO4 (aq) --> H2S(g) + I2 (s) My only question about this equation is...how do I know how many electrons I need to put on both sides? Other than that I know how to do it.
February 25, 2012 by Aria

Alg 1
Solving quadratic equations: What is the radius of the largest circular quilt that can be made with an area less than or equal to 70 ft^2? Round your answer to the nearest tenth of a foot if necessary. Please solve and explain. Thanks
April 6, 2013 by Jane

chemistry urgent!
what is the net ionic for these following balanced equations: 2(NH4)3PO4(aq) + 3Ba(OH)2(aq) -> Ba(PO4)2(s) + 6H2O(l) + 6NH3(g) 2HNO3(aq) + K2CO3(aq) -> H2O(l) + CO2(g) +2KNO3 NaF(aq) + HCl(aq) -> NaCl(aq) + HF(aq)
April 25, 2014 by Anonymous

Math - Alegbra 2
In a certain math class, each student has a text book, every 2 students share a book of tables, every 3 students share a problem book, and every 4 students share a mathematics dictionary. If the total number of books is 75.. how many students are in a class? how many students ...
December 2, 2006 by AS

math
can somone help me with this one , what equations do i have to use or what do i have to to inorder to see if this is possible Lori Morgan has $16,000 invested in Disney and Intel Stock. The Disney stock currently sells for $30 a share and Intel stock for $70 a share. Her ...
June 3, 2007 by jas

MATHS
Find the number of real solutions of the system of equations. x^2−y^2=z y^2−z^2=x z^2−x^2=y
May 17, 2013 by HELP!!

Geomtric Series
I need to find the equations of the following, using Σ (and the n=1 which is at the bottom of the Σ) (and infinity is at the top of the Σ) 1) 5/1 + 8/1 + 1/1 + 14/1 + . . . 2) 6/5 + 9/8 + 14/11 + 21/14 + . . . 3) -6/3 - 4/4 - 2/5 - 0 + . . . 4) 9/1 + 36/4 +27/9...
March 29, 2009 by Janet

chemistry
What is the balanced equations for: .Calcium and ethanol .Potassium dichromate, Dilute Sulphuric Acid and Ethanol .Ethanol abd oxygen
May 28, 2010 by Disturbed student

Math 222
Please help me solve this system of equations? Sorry addition/equal key is not working. -2x plus 9y equal 3 -3x-4y equal 22
April 27, 2015 by Tika

Algebra
A gardener combines x fluid ounces of a 20% liquid fertilizer and 80% water mix with y fluid ounces of a 5% liquid fertilizer and 95% water mix to make 30 fluid ounces of a 10% liquid fertilizer and 90% water mix. a. Write a system of linear equations that represents the ...
January 16, 2013 by Amie

math
A teacher drove 280 miles to attend a mathematics conference and arrived 1 hour late. The teacher figured out that, had she increased her average speed by 5 mph, she would have arrived on time to the conference. What was her average rate of speed? *explanations would be ...
September 17, 2007 by Rachel h

chemistry
What are the balanced equations and the net ionic equations for the following reactions? Sodium phosphate and cobalt nitrate Sodium carbonate and cobalt nitrate Sodium hydroxide and cobalt nitrate Sodium phosphate and copper nitrate Sodium bicarbonate and copper nitrate Sodium...
April 17, 2012 by Heny

Math
Using all four numbers 8, 4, 2, 1 --in that order, mkae equations that equal 0 through 10. (you may use the operations +,-,x and divide in any order and any number of times). 8-4-2-1=1 2? 8 divided by 4 + 2=3 4? 8/4/2+1=2 8/4+2x1=4
January 8, 2007 by Logan

math
Find equations for the asymptotes of the hyperbola x2/9 - y2/81 = 1 Rewrite the equation as (x/3)^2 - (y/9)^2 = 1 When both x and y are very large in absolute value, the "1" on the right is negligible in comparison, so y/9 approaches +/- x/3 The asymptotes are therefore y = 3x...
August 5, 2007 by zinnia

math
In my book, it says to use a number line to find the sum of the equations. Should I draw a numberline on my paper, or just write down the answer on the paper?
October 22, 2009 by lily

math
The question ask: Shonda owns a business that transfers photos to CD-ROMs. She charges his customers $24.95 for each CD-ROM. Which of these equations could be used to claculate her profit ''p'' for creating ''n'' CD-ROMs? answer and how did you get it?
October 12, 2010 by pralowe

math
Create your own word problem that uses a system of equations to solve. Your problem must include the following words: beach,hammock,dance,and troll.
February 24, 2011 by Nick

trig
Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0
December 11, 2011 by Josh

geometry
If four angles of a convex pentagon measure 120°, 93°, 108°, and 101°, find the measure of the fifth angle. Show equations and work that lead to your answer.
January 7, 2012 by sharon

calculus
Use the disk or the shell method to find the volume of the solid generated by revolving the region bounded by the graphs of the equations about each given line. y = x3 y = 0 x = 3 a)the line x = 4
January 25, 2012 by ReinaS

Chem 221
I know during the preparation of synthetic banana oil the gas that was released was CO2, but what are the balanced equations for two reactions that took place during the operation?
February 27, 2013 by Jazzmine

phisics
46. Balance these equations: (a) ____Fe(s) + ____O2(g)h____ Fe2O3(s) (b) ____H2(g) + ____N2(g)h____NH3(g) (c) ____Cl2(g) + ____KBr(aq)h____Br2(l ) + ____KCl (aq) (d) ____CH4(g) + ____O2(g)h____CO2(g) + ____H2O(l )
June 2, 2013 by jamya

Chemistry
Molecular, ionic, and net ionic equations for ammonium chloride + potassium sulfate. Also what is the observation. Is it 2NH2Cl + Na2SO4 = (NH4)2SO4 + 2NaCl???? Please help!
October 13, 2014 by Tyler

chemistry
write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction
October 19, 2014 by jake

Exponential Equations
The Bruce’s purchased $2500 worth of GIC’s. How long, t, will it take for the investment to increase to $3500, if the interest rate is 2.75%. T= 3500/2000 =1.4 t= 1.4/1+0.0275 What do I do from here
April 1, 2015 by Anonymous

Pre-Calculus
Can someone please explain on how to solve this equation so I can do the others that are similar to this one? Find the solutions of the equations that are in the interval [0,2pi) cos x cot^2 x= cos x Thank you!
May 9, 2015 by Anonymous

ALGEBRA 1!PLZ HELP!
Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve the first equation for y. y = 2x-5 Substitute that for y in the second equation and solve for x. Then use the value of x to substitute back into the first equation and solve for y. Post ...
November 6, 2006 by SANDRO!

Mathematics
The formula Total cost=Cost + Shipping cost + Maintenance is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+M. Solve the formula for S, the shipping cost of the asset. S=?
September 8, 2013 by Amy

Economics/Algebra
Airline pricing is a good example of price discrimination. Airlines set different prices for first-class and excursion. Suppose the economics division of a major airline company estimates the demand and marginal revenue functions for first-class and excursion fares from Los ...
November 9, 2009 by too old

Mathematics
I have a simple question but am having a hard time understanding the explanation of an unreasonable answer. Any help would be helpful. The question is, an auditorium holds 137 students but is only 60% full. How many students are in the auditorium? The answer is 82.2 obviously ...
April 10, 2007 by Viv

math
I hope i am on the right track. Please look at my answer so I am doing correctly. The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing a vowel from the hat? (vowels are a, e, i, o u.) Number of letters...
July 7, 2012 by Bria

Mathematics for Liberal Arts
You are on a TV show. You have been asked to either play a dice game five times or accept a $50 bill. The dice game works like this: If you roll a 1, 2 or 3, you win $46. If you roll a 4 or 5, you lose $22. If you roll a 6, you lose $85. Should you play the game? Use expected ...
November 20, 2009 by Sandra

word problems in algebra
The cost of producing a number of items x is given by C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of producing one more item). (a) If the fixed cost is $40 and the variable cost is $10, write the cost equation. (b) Graph the cost equation. c) ...
April 5, 2007 by Amanda

calculus
how would you find the median of a pdf picture it basically is a triangle with points (0,0) (6,.2) (10,0) do i need to find the slopes to find equations for the lines? thanks!
April 7, 2008 by tia

Chemistry
Calculate the enthalpy of reaction. D + F --> G + M using the following equations and data: G + C --> A + B ΔH = +277 kJ C + F --> A ΔH = +303 kJ D  B --> M ΔH = -158 kJ
March 21, 2011 by Josh

Chemistry
Calculate the enthalpy of reaction. D + F --> G + M using the following equations and data: G + C --> A + B ΔH = +277 kJ C + F --> A ΔH = +303 kJ D  B --> M ΔH = -158 kJ
March 21, 2011 by Josh

Chemistry
Ammonia, NH3, is a stronger ligand than Cl- but weaker than CN-. Complete the balanced equations for the reactions that are predicted to occur. CoCl6^3- (aq) + CN- (aq) ---> Co(NH3)6^3+ (aq) + Cl- (aq) ---> Co(CN)6^3- (aq) + NH3 (aq) --->
June 13, 2012 by Jane

Math
Use the substitution method to solve the following system of linear equations: x + y = 6 x = –y + 2 A. There are an infinite number of solutions. B. The solution is (2, 4). C. The solution is (4, 2). D. There is no solution.
December 6, 2012 by Help!!!!!!!!!!!!!! Fast its urgent Please!!!!!!!!!

College Trigonometry
Eliminate t from the two equations x = vtcos(theta) and y = vtsin(theta) - (gt^2/2) and obtain a relationship between x and y (assume that v, g and theta are constants)
January 25, 2015 by Jhersey

math
Which of the following algebraic equations models the English sentence, a number decreased by two is equal to four? A. w + 2 = 4 B. 2 − w = 4 C. w − 2 = 4 D. w = 2 − 4
February 25, 2015 by Angelina

math
Can someone please explain this problem Find the general solution to the linear system of differential equations. x'1 x'2 x'3 = −4 −4 5 0 −4 4 0 4 2 x1 x2 x3
April 25, 2015 by Anonymous

Mathematics
Pam and Tim decide to start saving money for their daughter's college education. They open a college savings plan with a 400 initial investment and next month start to make monthly deposits of 100. If the account pays 8.00% compounded monthly, how much will the account be ...
November 17, 2008 by Maddie

PROBLEM SOLVING IN MATHEMATICS
a landscaper bought same decorative cement blocks from a landscaping supplier. the supplier charged 5% sales tax and the total came to $315. without the tax, the landscaper could have bought 6 more blocks for the same total cost. how many blocks did the landscaper buy?
November 29, 2011 by alya -ASAP

mathematics
the theoretical probability of winning the lottery is 1/1,000,000,000.which of the ff is true if you purchase a lottery ticket?A.you will only win the lottery if you buy 1,000,000,000.B.you will never win the lottery.C.you will definitely win the lottery.D.you might win the ...
March 23, 2013 by francisca

math
in a mathematics class, half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 71. which of the following statements is true about the distribution of the scores? a: the mean is greater than the ...
February 8, 2013 by Taylor

math
in a mathematics class, half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 71. which of the following statements is true about the distribution of the scores? a: the mean is greater than the ...
February 8, 2013 by Taylor

math
in a mathematics class half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 7. which of the following statements is true about the distribution of scores? A: the mean is greater than the median...
February 14, 2013 by Taylor

Algebra
I need help on one particular part of algebra because i forgot what my teacher said! Here is the question: Directions: Find the x- intercept of the graph of the equation. 1. x+ y= 5
November 8, 2007 by Eva

algebra
need help with 2 questions first It has been a long time since I did algebra and dont rememeber how to work the problems 1/5(x+1) + 2/5(x-1) = 3/10 2nd problem 0.1(2x-1) + 0.02(4x + 4) = 0.05x
September 21, 2009 by lisa

algebra 2
what is the answer to algebra with pizzazz page 100; what should you say if you see a tall, wrought-iron tower in paris, france? there are 24 blanks
April 12, 2011 by tiffany

mathematics
A spring with a mass of 4 kg has damping constant 28, and a force of 12 N is required to keep the spring stretched 0.5 m beyond its natural length. The spring is stretched 1 m beyond its natural length and then released with zero velocity. Find the position of the mass at any ...
April 24, 2012 by Marwan

chemistry - hess's law (check + help)
31. Carbon monoxide reacts with hydrogen gas to produce a mixture of methane, carbon dioxide, and water. (This mixture is known as substitute natural gas.) 4CO(g) + 8H2(g) → 3CH4(g) + CO2(g) + 2H2O(_) Use the following thermochemical equations to determine the enthalpy ...
June 8, 2011 by Farah

Algebra 2
What's the answer to Algebra With Pizzazz B-50, Page 60???
January 7, 2009 by Terrell

Algebra
Algebra - Substitution Question? A+B+C=1 A+C= -1/2 A-B+C= -7 What are the values of A, B, and C?
March 9, 2009 by Michelle

algebra
Hi, how can I solve this equation using algebra? y= 9x+50, many thanks
May 27, 2010 by Rich

College algebra
What is the fundamental theorem of algebra for x^6-64?
November 12, 2010 by amy

Algebra
Will you explain the concept of "i" in algebra? Problem: 4+2i/4-2i
April 24, 2012 by Lee

Algebra
How do you solve x/a - 1 = y/b for y? Algebra question I'm stuck on. Thanks!
November 19, 2013 by This Girl

Algebra
I need help with some Algebra! Can someone help?
May 28, 2014 by Sandy East Ward

math, algebra II
Can someone explain to me step by step how the book got to this answer i want to understand the steps....thanks Find the inverse, if it exists,for the matirx (*I used the underscore to separate the numbers within the matix) -2_1_3 3_-1_2 -4_2_0 the answer is: -4_6_5 -8_12_13 ...
July 22, 2007 by student

math
How do I know that x^2-7=y is a function? thanks you know its a function because its a parabola (x^2) parabolas are functions because there is only one x value per y value. So I know it is a function because it has (x^2)? Is that the rule? If it has x^2, it's a function and if...
March 20, 2007 by Mimi

Math
Rational Equations Solve: How do you work it out? 1. x/4 - x+2/3 = 12 (x+2 are in the numerator) 2. 2y/4 - y/7 = y-3/2 (y-3 are in the numerator) 3. p/6 - 2p/5 = 4p-5/15 (4p-5 are in the numerator)
April 24, 2014 by Sadie

math
solve the following smultaneous equations 3x plus 2y =21 and x plus y = 8 3x -14y =0 and x - 4y plus 1 =0
May 17, 2014 by lerato

math
Identify the solution of the system of equations if any -2x-4y=1 , 12y=-6x-3 is this no solution or (o,-1) (-1,0) or infinitelt many solution
October 28, 2014 by ann

Mathematics
Kate has a tennis lesson every 5 days. She has a basketball game every 8 days. If she has both a tennis lesson and a basketball game today, on what day will she have both again?
April 13, 2012 by Maria

mathematics
The cafeteria has 144 bananas, 36 pears, and 72 apples. Each student gets the same number of pieces of fruit. What is the greatest number of students who can receive fruit? The 48 members of a chorus will sit in rows in front of the 300 members of the audience. All the rows ...
October 15, 2013 by Aubrey

childcare
6. You've developed a file in which you keep pictures of different colored birds. One day you give the group of pictures to a preschooler and ask him to separate the pictures by color-all red birds in one pile, all blue birds in another pile, and so on. He should then count ...
April 7, 2011 by Heather

math
Solve systems by substitution 5x - 2y = -5 y - 5x = 3 Substitute 5x + 3 for y in the first equation, and solve it for x. Once you have x, use either of the two equations you wrote to solve for y.
August 8, 2007 by Robin

Quadratic Equations
The length of a rectangle is 5 ft more than the width. If the area of the rectangle is 36 sq. ft what are the dimensions of the rectangle? (Please provide steps/explanation to solve this problem.)
March 29, 2009 by purpletree

geometry
A picyure,18cm by 15cm,has a uniform frame around it.if the area of frame is 234cm2.find the dimensions of the frame,solve in quadratic equations
August 3, 2014 by francia marquez

Mathematics
If A gives B $3, B will have twice as much as A. If B gives A $5, A will have twice as much as B. How much does each have? Explain clearly your working.
January 15, 2012 by Diamon

ochem
Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
January 29, 2009 by steve

chemistry
Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
February 2, 2009 by Jane

chemistry
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
January 31, 2010 by Fann

Chemistry
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, 2011 by Shannon

Please help! Chemistry
In a fume cupboard molten lead(ii) bromide is electrolysed using graphite electrodes. Write half-equations for the reaction at the (i).cathode (ii). Anode (iii). Overall equation (states required).
August 25, 2012 by Jeconiah

Please help! Chemistry
In a fume cupboard molten lead(ii) bromide is electrolysed using graphite electrodes. Write half-equations for the reaction at the (i).cathode (ii). Anode (iii). Overall equation (states required).
August 25, 2012 by Jeconiah

English
Create a paraphrase of the following sentence from “The Cold Equations”: "Our time is up, Gerry—I have to go, now. Good—" Her voice broke in mid-word and her mouth tried to twist into crying.
January 8, 2015 by tj

Vectors and Math
The textbook answer is -80 Question: find (3a+4b)(2b+4a) if a= -i-3j+k and b=2i+4j-5k What I did: =6(a)(b) - 12|a|^2 + 2|b|^2 - 4(a)(b) =2(a)(b)-12|a|^2+2|b|^2 substitute a and b with given equations. Added like terms for each part.(too long to write out) and I got -20-6+38+4-...
February 7, 2015 by Help-me-Please

mathematical physics
Determine the scale factors for an orthogonal coordinate system ( s, t, v ) whose coordinates are related to the cartesion by following equations: x = 2st:, y = s^2-t^2:, z = v Also write down an expression for the square of the arc element.
March 21, 2015 by gourav

mathematical physics
Determine the scale factors for an orthogonal coordinate system (s, t, v) whose coordinates are related to the Cartesian by the following equations: x = 2st, y = s^2-t^2, z = v Also write down an expression for the square of the arc element.
March 23, 2015 by gourav

Pre-Calculus
Write the standard form of the equation of the circle that passes through the points at (4,5), (-2,3), (-4,-3). I have gotten to the point of the system of equations but do not know know how to proceed. I have: 4D + 5E + F + 41 =0 -2D + 3E + F + 13 =0 -4D - 3E + F + 25 =0 Any ...
September 1, 2008 by Lucy

Chemistry
I'm having alot of trouble in chemistry. Currently were studying chemical equations and reactions. I would like to know if this is a single or double replacement reaction. 2Li + H2O ---> 2LiOH + H2
March 13, 2009 by Alexandria

maths
im trying to rearrange the following equation for x but getting confused because of the brackets and squares. I understand the process of changing the subject but on more simple equations. Please can you help me. Here's the equation y = 3(x+5)^2
November 19, 2009 by confused

Math 156
Write two different equations that can be used to solve this problem: a low of -4 degrees is predicted for tomorrow. If the tempeture is now 8 degrees by how much must it change?
November 20, 2009 by Rmz

totally math
some ordered pairs for a linear function of x are given in the table below. x y 1 1 3 7 5 13 7 19 sorry im not good at tables which of the following equations was used too generaTE the table above a y=2x+1 b y=2x-1 c y=3x-2 d y=4x-3
April 7, 2010 by eva

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