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May 3, 2016

Search: mathematics: algebra;equations

Number of results: 43,753

math
PLEASE!!!!i need help on these 4: *4y=15-3x 2y=3x+21 *4x=5y-14 y=-6x-9 *5x=4y-30 2x=3y=-12 *2/3y=10+4x 5x=1/3y-8 use linear combinations to solve the system of linear equations thank you!!!
January 24, 2011 by HELP me please asap!!

need alot of help please math
hello i need help with system of equations theres 3 only thank you 2x+3y-17 3x+y=31 2(x-3y)=24 y=3x-2 2(x+4)=24 x+y=17
April 18, 2011 by hannia

trig
The parametric equations for a curve in the x-y plane are x=2+t^2 and y=4-3t. Determine the points where the curve intersects the x-axis.
April 19, 2011 by casey

Chem
Balancing equations? NaOH + H3PO4 ----> Na3PO4 + H2O C3H8 + O2 ----> CO2 + H2O
April 26, 2011 by Laura

Science (Chemistry)
The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!
June 13, 2011 by Grace

math
Solve each system of linear equations by both graphical and algebraic line 1 x+2y=4 line 2 x-y=0
August 21, 2011 by Abel

Differential Equations
Solve the seperable differential equation for U. du/dt = e^(5u+7t) - Using the following initial condition U(0) = 12
August 27, 2011 by Kody

4th grade math help
Explain how the variable B has two different values in the two equations 6 - B = 5 b = 1 B + 5 = 15. B = 10 Thanks!
October 25, 2011 by Zack

geometry
x is less than y and 20 less than z. write a system of equations and find the measures of the three angles
November 7, 2011 by davonte

Polar equations
write the polar eqaution 3 = r cos (theta - 315) in rectangular form.
April 20, 2012 by tabby

Chemistry 132
What is the net ionic equations for Ca Cl2 + Na2 CO3=Ca CO3 + 2Na Cl
February 25, 2013 by Anonymous

Math 116
Identify the solution(s) of the system of equations, if any. -6x-2y=12 4y=-12x-24 a. no solution b. (0,-2) c.(-2,0) d.infinitely many solutions
June 21, 2013 by Queta

maths
Prove that if p and q are rational and p is not equal to 0, the roots of the quadratic equations p x(square) + 2qx -p +2q = 0 are rational.
August 9, 2013 by Jayden Haddy

Maths
Consider the line defined by the parametric equations x=3d-10, y=2d+1. The y-intercept of this line can be expressed as a/b. Find a and b.
October 27, 2013 by CHRIS

Have I done this right
write the equations in logarithmic form 216 = ^63 answer In(e^4.5) 49 = (1/7) ^-2 answer 2=log(3x)
May 13, 2014 by Nellie

algerbra
Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 12y = -12x - 12 no solution (0, -1) (-1, 0) infinitely many solutions
September 8, 2014 by robert

math,help
on one of last week homeworks i got this one wrong can someone explain to me what is the correct format. The demand supply equations for a certain item are given by: D= -5p+40 S=-p^2+30p-8 The correct answer was: $1.43 how do you get to this answer because i've tried it and it...
April 19, 2007 by jasmine20

Math
The traditional method of determining the human age equivalent of a dog is to multiply its age by 7 years. The method we used in this project was to use equations based on scientific data to determine the human age of dogs. In my opinion, the ____________method (equations or ...
March 9, 2016 by Anonymous (Help ASAP)

Mathematics
How would you solve for: (the square root of 7-the square root of 3)^2 ^=the power of [sqrt(7) - sqrt(3)]^2 = 7 + 3 - 2sqrt(21) = 10 - 2sqrt(21)
December 5, 2006 by London

mathematics
How many ordered pairs of solutions (a,b) are there to a/b−b/a−2/a−2/b=0, where a and b are integers from −100≤a,b≤100?
March 16, 2013 by harsh

Mathematics
Eureka is 9 years younger than Rex. In 3 years Rex will be twice as old as Eureka. How old are they now?
September 18, 2013 by Needer

Algebra (check answers)
Could you please check my answers we are using substitution to solve each system of equations. And at the end of every solution you are supposed to have an answer as a coordinate. 1. x=2y x+y=3 Answer (1,2) 2. 2y=3 x-y=10 Answer: (10,10) 3. y=x+7 x+2y= -21 Answer: (-3,-4) 4. ...
April 27, 2009 by Stacie

MathEMATICS
high fountain of water is located at the center of a circular pool. Not wishing to get his feet wet, a student walks around the pool and measures its circumference to be 15.0 m. Next, the student stands at the edge of the pool and uses a protractor to gauge the angle of ...
October 4, 2010 by Chloe

Algebra
Here is the problem: You are going to make ans sell bread. A loaf of Irish soda bread is made with 2 cups flour and 1/4 cup sugar. Banana bread is made with 4 cups flour and 1 cup of sugar. You will make a profit of $1.50 on each loaf of Irish soda bread a nd a profit of $4 on...
October 13, 2008 by Skyelar

Algebra
A farmer plans to plant 270 acres of his farm with wheat and soybeans. For every 2 acres of land planted with soybeans, the farmer wants to plant 7 acres of land with wheat. The farmer uses the following system of equations to determine how many acres of each crop he should ...
April 25, 2011 by mary

math
Solve for each system and equations. y=-x-2 y=3x+2 set -x-2=3x+2 solve for x. thanx i was minusing 2 instead of adding two thanx alot
December 17, 2006 by Tony

math
what are the general equations for the conic sections 1)parabola 2)circle 3)ellipse 4)hyperbola 5)inverse hyperbola
September 5, 2007 by brittney

equations
Can anyone check this answer out for me... 2(5-6y) = 2 x 5 , 2 x -6 = 10 - 12y or should the 12y appear before the 10 ??? am not sure of the rule... thanks
January 10, 2008 by tommy

math
Find the value of k such that the system of linear equations is inconsistent. {4x-8y = -3 {2x+ky = 16 I know that the answer is k = -4 but I don't know how to solve to get that answer.
May 7, 2008 by anonymous

equations
does it make a diffrence what two points you chooose on a stragight line to find the slope of the line
September 3, 2008 by isaiah

Physics help!
I need to know all of the equations for WORK problems (Physics). I'm not sure where to find them. if someone could help id appreciate it.
December 7, 2008 by Jim

math
can someone explain step by step to solve system equations and example ill show here 3x+4y=-2 x=-2y
January 13, 2009 by sherri

math
Which pair of equations share a solution? Answer: 5x+2=32 4x+9=5(14-x)-7 -I know the answer but I have absolutely no idea how to get it help please!
October 28, 2009 by Channing

math
the sum of a numbers is 15 and their difference is 4. form a pair of simultaneous equations and solve to find the numbers.
January 15, 2010 by disha

Math - Equations of planes
Write a vector equation and scalar equation of the plane containing lines [x,y,z]= [-2,3,12]+s[-2,1,5] [x,y,z]= [1,-4,4]+t[-6,3,15]
August 27, 2010 by Shaila

chemistry
strontium nitrate reacts with potassium iodate. What is its molecular,ionic and net ionic equations?
October 23, 2010 by Stephanie

Math
We are doing multi-step equations in math. And this equation is kind of hard for me because the variable is alone. h-6+7h=42 What does "h" equal?
May 5, 2011 by Jennipher

Math
When you use the quadratic formula (x= -b+/=......) can you use that on equations like X^4+2X-8? If not, how would you algebraically find the roots of: X^4+2X-8? Thanks!
June 19, 2011 by Christopher

Math
p - | 1 | 2 | 3 | 4 | q - | 5 | 9 | 13| 17| The table above represents a relationship between p and q. which of the following equations could be used to describe the relationship? a. q = p+4 b. q = p+7 c. q = 4p+1 d. q = 5p e. q = 6p-1
August 22, 2011 by Amy

quadratic equations
can you solve the equation using the quadratic formula x2 + 3x = 7? Explain and provide an exact answer.
January 17, 2012 by becca

Calculus..
5. Eliminate the parameter and write the corresponding rectangular equations: x=3-2sin theta and y=1+5 cos theta
July 3, 2012 by Isabella

Math
f(x)=3/(x+1) g(x)=(x^3)/5 h(x)=x^2+7x+10 a. f(x)=10 b. f(x)=g(x) c. g(x)=h(x) d. f(x)=h(x) I am told to solve the equations, but the term "solve" is so vague. I don't know what I'm doing. Please help lead me in the right direction. Thank you.
January 24, 2013 by Morgan

Alg 3
Put the following equations in standard form. State the center and the radius. x^2-5x+y^2+4y=-3 I get how to end up with (-2.5,2), what is the radius?
April 3, 2013 by Shelby

organic chemistry
Write equations showing how caffeine could be extracted from an organic solvent and subsequently isolated
April 16, 2013 by Kelli

Calculus
Graph the parametric equations: x=cos(t) y=sin(t) z=cos(2t) How would I go about solving this problem? thanks!
April 21, 2013 by Anonymous

Calculus
Graph the parametric equations: x=cos(t) y=sin(t) z=cos(2t) How would I go about solving this problem? thanks!
April 21, 2013 by Anonymous

maths
for the curve y=(x^2+1)/(x^2-4), find: (i). The cordinates of the turning points (ii). The equations of the asymptotes (iii). Sketch the curve
October 9, 2013 by changaya

Math
You have used tables, equations, and graphs for math. When would you use each representation. explain
November 16, 2013 by Anonymous

Science
Balancing equations a) Mg + HCl --> MgCl2 + H2 b) K + H2O --> KOH + H2 c) Li + H2O --> LiOH + H2 d) Fe + O2 --> Fe2O3 Please help
November 16, 2013 by Anonymous

Science
Balancing equations a) Mg + HCl --> MgCl2 + H2 b) K + H2O --> KOH + H2 c) Li + H2O --> LiOH + H2 d) Fe + O2 --> Fe2O3 Please help
November 16, 2013 by Anonymous

science
Balancing equations a) Mg + HCl --> MgCl2 + H2  b) K + H2O --> KOH + H2  c) Li + H2O --> LiOH + H2  d) Fe + O2 --> Fe2O3  Please help
November 17, 2013 by anonymous

Math
can someone check to see if these inequality equations are the correct standard form? y>_-3/2x+6 = 3x+2y>_12 y>-3x+6 = 3x-y>6 y>3x-6 = 3x+y>6 y<3x-6 = 3x-y<6 y<_-3/2+6 = 3x+2y<_12
January 13, 2014 by Anonymous

equations/mrs sue
11=22t please help having trouble please show the steps also 7r=-7/2, m/7 =12
April 16, 2014 by rian

Engineering
For what values of (’ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-’)x+4y+2z=4 4x+(5-’)y+2z=4 2x+2y+(2-’)z=2
August 2, 2015 by Edward

MATH
what is a good way to show fractions w/ long equations? Example: 93 + (-3 x 9)/22+1(-4 +5) (note: this is a random example)
February 25, 2016 by Shae

Math
Can u please guide me on solving these two equations please. Thank You 3.6-7.6 (-8.3)-11.4
August 27, 2009 by Liz

System of equation
solve system of equations graphically and check 2x - y = 5 3x + 2y = 4
September 6, 2010 by Genevieve

linear equations
What is the solution to the linear system –4x + 2y = –56 and –3x – 6y = 33?Question 3 options: (–9, 10) (–9, –10) (9, 10) (9, –10)
January 5, 2011 by alli

Math
Solve the system of equations by graphing. Then classify the system.x+y=8x-y=-2
May 20, 2011 by Greg

Precalculus
More log/exponential equations log2 x + log2(x+2) =3
December 11, 2012 by Sarah

distance
find the distance between lines whose equations are: y=-1/4x+2 and y=-1/4x-9/4. d=γ(1-(-3)^2 +(1-2)^2
January 5, 2015 by spaghetti

math
Are all relations equations? Is there any instances where a relation is not a relation
February 22, 2016 by anon

Has anybody read this book
has anyone read the short story.. The cold equations
March 24, 2016 by Oscar

Chemistry
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 22, 2012 by Rick

Mathematics
Find four consecutive even integers such that four times the greatest is 36 more than more than the sum of the other three.Four times a number increased by 5 is 37.Find the number.
November 26, 2015 by Athena

Maths (Simultaneous equations)
You know f(x)= ax² + bx + c. Well when you get the equations why is it always like: 1) a + b + c = something 2) 4a + 2b + c = something 3) 9a + 3b + c = something I mean why is the first one always 'a+b+c'? etc. Also does it have to be f(x) or can it be f(n) instead? Thanks...
October 6, 2006 by ana

mathematics
find the area of the region between the curve y = 3-x^2 and the line y = -1 by integrating with respect to y you first have to solve for x x=(3-y)^(1/2) then area ⌠ (3-y)^(1/2 dy from -1 to 3 ⌡ =-2/3 (3-y)^(3/2 | from -1 to 3 = -2/3(0 - 8) = 16/3 but this is only ...
April 18, 2007 by denisa

Algebra
If you have these three origins: (0,0) (0,952) (863,0) How do you find the last point where the two lines intersect? Would really appreciate the help. Thanks. Parker, I'm not quite sure what the question asks. Three origins? Is this standard analytic geometry we're doing? I ...
July 12, 2006 by Parker

mathematics
In 1957, killer bees started to spread out from Sao Paulo, Brazil at the rate of about 200 miles a year. At this rate, in what year were they expected in the vicinity of Honduras, Central America- a distance of 3800 miles? (1) 1960 (2) 1966 (3) 1973 (4) 1976 (5) 1985 if I did ...
February 24, 2016 by mg

mathematics
the average age of a family of six is 25 years.The average age of the four children is 15 years.If the father is 2 years older than the mother,calculate the age of the mother.
October 23, 2010 by Iby

Mathematics
Mary's age is 2/3 that of Peter's. Two years ago Mary's age was 1/2 of what Peter's age will be in 5 years time. How old is Peter now? Explain your workings
November 7, 2011 by Michael

Mathematics
water is poured into a cylindrical bucket with the base area of 300cm squared if 4.8 leters of water is poured into the bucket what is the height if the water in the bucket
April 19, 2012 by Kalene

mathematics
1} the first term of an AP is 2 and the common difference is 3.Find the sum of the first 11 terms. 2}The 2nd and 5th terms of a GP are -6 and 48 respectively.Find the sum of the first four terms
September 10, 2015 by promise

Formulas and Literal Equations
Have not a clue please help to figure this one out: P-Q=-R, for Q Do you wish to solve for Q? If so, subtract P from both sides. P-P-Q=-R-P Combine terms. -Q=-R-P Multiply by -1 Q = R+P
January 27, 2007 by TN

math
I am having a really hard time with these! 1. Solve system of equations x+3y=7 (1) x=8-3y (2) 2. find slope (9,8) (10,-7) 3. translate into an algebraic expression The product of 46% and some number
January 5, 2009 by deedra

math
x = 3 - y^2 y = x - 3 Find the points of intersection. If someone could even get me to the point where it gets written in general form (both equations set to 0..) I would be forever grateful.
January 20, 2009 by strawerryfields

Math
I need to write 2 equations that represent the same exponential function with a y-intercept of 5 and an asymptote at y=3. I got y=2^(x+1) + 3 but I don't know how to find the second equation. Can someone please explain this to me. Thanks.
November 27, 2009 by Jim

Math
I need to write 2 equations that represent the same exponential function with a y-intercept of 5 and an asymptote at y=3. I got y=2^(x+1) + 3 but I don't know how to find the second equation. Can someone please explain this to me. Thanks.
December 1, 2009 by Jim

quantitive literacy
Select an investment plan for a family with a child that is x years old and has y dollars to invest. How can I make this into two different equations to be graphed?
March 16, 2010 by timothy nies

Chemistry
Write net ionic equations for these reactions : Cu^2+ + Fe -> Hg^2+ + Fe-> Fe^3+ +Fe-> Pb^2+ +Fe-> Ag^+ + Fe-> and then the same but instead of Fe, addition of Cu to the six solution that I wrote before.. What ions are reacting in each case? please help me with ...
May 9, 2010 by Carolina

Physics
How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.
January 28, 2012 by Emily

Physics
How do you calculate the magnitude of the uncertainty of the net force, U{F}? I was given several different equations but for some reason I'm still confused. Any help would be greatly appreciated.
January 28, 2012 by Emily

geometry
If the parallel sides of a trapezoid are contained by the lines and , find the equation of the line that contains the midsegment. Show equations and all work that leads to your answer.
April 22, 2012 by Anonymous

Chemistry
Balance the following equations for a half reaction that occurs in a acidic solution A) ClO3- --> Cl2 B)H2BO3- -->BH4- C) MnO4- + HNO2 -->NO3- +Mn2+
November 19, 2012 by Anonymous

english
Create an accurate summary of “The Cold Equations” that details the important events of the story. Provide your answer in three to five sentences. Can someone help me with this please?
September 19, 2013 by zack

math
Find the ordered quintuplet (a,b,c,d,e) that satisfies the system of equations a+2b+3c+4d+5e=177, 2a+3b+4c+5d+e=154, 3a+4b+5c+d+2e=146, 4a+5b+c+2d+3e=138, 5a+b+2c+3d+4e=165 This a really hard questioon but don't give up, please.
September 19, 2013 by Speedo

Chemistry
please help me balance these equations using the method of half reactions.. Na + HCL = NaCl + H2 Pb + PbO2 + H2SO4 = PbSO4 +H2O Thank you, even a little help is appreciated.
April 2, 2014 by Justin

chemistry
What is the net ionic equations for: 1. Arsenic(III) iodide + Sodium sulfide 2. Lead(II) nitrate + Ammonium oxalate 3. Magnesium chromate + Copper(II) sulfate
April 27, 2014 by Collin

English
Create an accurate summary of the “good-bye” scene between Marilyn and her brother in “The Cold Equations.” Provide your answer in three to five sentences.
November 17, 2014 by Lanea

Chemistry
Write equations for the separation of Fe2O3 from Bauxite ore, along with a short description of the process. I have no idea where to start for this question, any help would be appreciated!
March 17, 2015 by Anonymous

University of Papua New Guinea
Give equations with reaction conditions to show direct esterification methods for the production of A) isopropyl butanoate B) ethyl- 2-methylpropanoate
October 12, 2015 by Esther

MATHS EDUCATION
Thanks so much for the previous help.Please answer these for me: 1.How does Process errors in mathematics affect academic achievements? 2.What is the influence/effect of the errors of beginning Mathematicians on students academic achievements? 3.What type of a research design ...
October 23, 2006 by MFONOBONG(A.S.A.P)

Discrete Mathematics
7. Which of the following scenarios could be described by the real valued function f(x) = x3 + 3x2 + 2x?: * A. A shoebox has a length that is 1 inch longer than its width and a height that is 1 inch longer than its length. B. We want to know the product of three consecutive ...
July 30, 2013 by Joy

Please Math
8. p + 4 < –24 p < –20 p < 28 p < –28 p < 20 9.p/8 ≥ –5 p ≥ 40 p ≥ 3 p ≥ –13 p ≥ –40 10. –5p > –30 p > 6 p < 6 p > –35 p < 35 11. Which inequality matches the graph? 3x + 1 > 4 3x + 1 ≥ 4 3x + 1 < 4 3x + 1...
December 17, 2015 by Hotline Bling

Math
Answer this please!!! Noelani was saving Luscious Lemon soda coupons, which came in the caps of the Luscious Lemon sodo bottles. There were two kinds of coupons: 5-point coupons and 2-point coupons. So far, she had collected 23 coupons, worth 76 points. How many 5-point and 2-...
September 18, 2006 by Nick

function
consider the function g(x)=x^3+5x^2-4x+4.determine: 1)g(37) 2)the value of x between zero and a hundred such that g(x)=145456 how do i do this? 1) put in 37 for x, and compute. 2) put in 145456 in for g(x), and solve for x. for the first one, just substitute 37 for x and ...
May 25, 2007 by Emma

New AP Chem Question for Dr. Bob
This is a Hess' Law problem. I think I got it but I'm hoping you could check it for me: Calculate the heat of reaction for changing 1 mol of silica, SiO2, that has been extracted from sand into the pure silicon that is needed to make computer chips. Use the following data: ...
January 23, 2007 by Belinda

math,correction
Graph each of the following equations by first solving for y. 2x – 3y = 12 so it would be: y = 2/3x – 4 and the solutions points would be: So (-3,-6) is a solution
January 14, 2007 by jasmine20

math
can someone solve these for me? -3x - 9 > 12 4 - x >= -10 x + 3/4 >= 1/2 -2x > 10 To solve, treat inequalities just as you would equations. For example, -2x>10 -2x/-2>10/-2 x>-5 I hope this helps. Thanks for asking.
May 29, 2007 by mike

Math repost for Samantha
Maths - samantha, Wednesday, October 10, 2007 at 3:24pm how do you graph linear equations?
October 10, 2007 by Ms. Sue

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