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February 1, 2015

Search: mathematics: algebra;equations

Number of results: 38,418

Chemisty
Write all possible quilibrium equations for KHP dissovled in water and then write the quilibrium constanst expressions for the equation.
May 9, 2012 by Brooke

College Math
Using EZgraph, graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph. 3. 4.9x 7.2y = 2.3 4. 2x = -8 5. 3.7x + 4.2y = 5.03
October 19, 2012 by Richard D

Chemis
Write a blanaced molecular equation for the reaction 2Na(NO3) + Cu(OH)2. Write complete ionic and net ionic equations?
October 29, 2012 by alexis

Chemistry
Write a blanaced molecular equation for the reaction 2Na(NO3) + Cu(OH)2. Write complete ionic and net ionic equations?
October 29, 2012 by alexis

AP Calculus
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 found the derivative of y^2=4x, but i don't know what to do next!
September 11, 2013 by Sarah

Math
Solve the following equations for the variable indicated. Please correct me if I'm wrong! 1. I=Prt for P Answer: I/P=rt 2. Solve C= 2r for r. Answer: C/r=2
August 31, 2014 by Anonymous

math,help
How do even solve this one sum of two numbers is 32. their difference is 6. what are the numbers? x-y=6 x+y=32 add the equations... 2x=38 and solve.
February 10, 2007 by jasmine20

math ,correction
Solve each of the following equations for x. Problem#3 (5)/(x+6) + (2)/(x^2+7x+6) = (3)/(x+1) My answer is: x = 5 Problem #4 (2)/(5)= (x-2)/(20) My answer is: 10=x whoa. good luck. =0
March 7, 2007 by jas20

Exponential Equations
HOw would you solve this equation 5^x+6=4 Correct me if I'm wrong so far.. x+6 ln5=4 Divide by x+6..which would be ln5=4/x+6...then what??
May 1, 2009 by Amber

simple equations ( math)
Tom's weight is 3/4 of Peter's. If Tom weighs 36kg, find the weight of Peters
January 10, 2010 by vanessa

simple equations ( math)
Share $100 between Joseph and Peter so that Joseph has 3 times as much as Peter.
January 10, 2010 by vanessa

physics
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a → m/s2, v → m/s, x → m , t → s)
September 17, 2010 by Kelly

acc. alg 2
exponentiating to solve equations: solve the eaquation, cheack for extraneous solutions log5(x+4)+log5(x+1)=2
March 20, 2011 by Kayla

Calculus
Find the turning points of y = 3 x 3 + 6 x 2 + 3 x 1 and determine their nature, also, find the equations of the tangents at these points. please help me
December 25, 2011 by Noor

Calculus
Let f(x)= (3x^2-2x+1)/(x-1). What are the types of asymptotes of f(x)? What are the equations of all the asymptotes of f(x)? The types of asymptote are vertical and oblique? x=1? Is there something wrong I did
February 28, 2012 by Jake

college math
system of equations: solve the following system of operations using matrices (row operations) {5x + y + z + w = -5} {x - 2y + 2z -3w = -4}
September 14, 2013 by Cece

Alegbra
The sum of two numbers is 30 and their difference is 2. Find the two numbers by writing and solving a system of equations.
February 27, 2014 by KevinJ

chemistry
Write equations for the ionisation in water of : A) hydrobromic acid B) nitrous acid C) carbonic acid D) sulfuric acid
May 11, 2014 by Haiano

Mathematics
Michelle rode her bicycle from her house to her school at an average speed of 8 miles per hour (mph). Later that day, she rode from school back home along the same route, at an average speed of 12 mph. If the round trip took her 1 hour, how many miles long is the round trip.
August 30, 2007 by Ryomasa

mathematics
The numbers 1,2,,17 are divided into 5 disjoint sets. One set has 5 elements, one set has 4 elements, two sets have 3 elements and the last set contains the 2 remaining elements. Two players each choose a number from 1 to 17 at random. The probability they choose numbers from...
February 6, 2013 by Anonymous1

Mathematics
Carletta has $10,000 to invest. As her financial consultant you recommend that she invest in Treasury Bills that yield 6%, Treasury Bonds that yield 7%, and coroporate bonds that yield 8%. Carletta wants to have an annual income of $680, and the amount invested in corporate ...
September 23, 2008 by Kevin

Math 116
Okay so now I am working on the substitiution portion of this assignment and I understand the first part by not the second can someone help? Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) ...
March 22, 2010 by KiKi

child daycare man.
you've developed a file in which you keep pictures of differnt color birds. one day you give the group of pictures to a preschooler and ask him to to separate the pictures by color-all red in one pile, all blue in an other pile, and so on. he should then count the number of ...
January 2, 2011 by sarah

Mathematics
an aircraft's reading shows time 8:55 at distance travelled 957km time 9:07 at distance travelled 1083 calculate distance travelled in km calculate the average speed of aircraft in km/h (that is what was asked it never said total distance it said calculate distance traveled in...
July 31, 2012 by INDIANA to Reiny

Math
In each case, consider what you know about the distribution and then explain why you would expect it to be or not to be normally distributed. I am really having a hard time understanding this. Any help would be great. a. The wealth of the parents of students attending your ...
January 14, 2010 by Jennifer

Mathematics
At Harlan County Damn in Nebraska, the U.S. Bureau reports that the storage content of the reservoir decreased from 117,811 acre-feet (38.4 billon gallons of water) on Septmber 6, 2006 to 115,579 acre-feet (37.7 billion gallons of water) on October 6, 2006. Suppose that the ...
September 8, 2008 by Kevin

Mathematics - Trigonometric Identities
Prove: sinx + tanx = tanx (1 + cosx) What I have so far: LS: = sinx + tanx = sinx + (sinx / cosx) = (sinx) (cosx) + sinx / cos = tanx (cosx + sinx) I don't know what to do now
November 8, 2007 by Anonymous

business mathematics
find the total amount due on a loan of N80,000.00 at 18percent simple interest at the end of 4months. (2)question is find the total amount due on a loan of N600,000.00 at 12percent simple interest at the end of 3years. Pls i need answer
February 25, 2013 by dennis

math
On T.V. game show, the constestant is aksed to select a dorr and then is rewarded with the prize behind the door selected. If the doors can be selected with equal probability. What is the expected value of the selection if the three dorrs have behind thema 40,000 foreight car...
November 13, 2009 by Kay Kay

to annonymus can you help me with math
How do i solve inequalitites with three variables. I still can't figure it outplease help. x+y=1 y-z=-3 2x+3y+z=1 the answers are 3,-2,1 how do get there by solving linear equations with three variables. 5x-2y-z=2 -y+2z=11 x+y+z=-3
October 22, 2006 by Jasmine202005

Chemistry
Can someone tell me when I add charges to my balancing equations? I know that you add charges when dealing ionic compounds (metal and nonmental), but what else? Acid?
February 4, 2009 by Chopsticks

5th grade
Will someone tell me a webpage my daughter can get help on solving equations, word problems w/ algebraic chains...or for 5th grade math. Thank you
September 10, 2009 by margaret

diffrential equations
Find two linearly independent power series solutions to the diffrential equation. State the first 3 therms of each series: 2x^2y''+xy'-(1+2x^2)y=0
July 28, 2010 by Jay

Pure math
1.Using your calculator,solve 4 in each of de 4lowing equations correct 2 1 decimal place,and with de restriction that 0 degree lessthanequals lessthanequals 90 degree
October 25, 2010 by Dirang

Pure math
1.Using your calculator,solve 4 in each of de 4lowing equations correct 2 1 decimal place,and with de restriction that 0 degree lessthanequals lessthanequals 90 degree
October 25, 2010 by Dirang

math 8
Martin graphed the lines for a system of equations. His graph resulted in 2 lines with different slopes. Which of the following is true about this graph?
July 1, 2011 by rober

calculus
Two lines through the point(1,-3) are tangent to the curve y=x2. Find the equations of these two lines and make a sketch to verify your results. Thank you
September 27, 2011 by Akanimo

Precalc
use completing the square to describe the graph of each function. How do you complete the square with this equations. please show me step by step so that I can understand it. x^2-4x+6
October 27, 2011 by Amy

Chemistry
Use the equations with the enthalpy information given below to calculate the H for the reaction: S(s) + O2(g) --> SO2(g) S(s) + 3/2 O2(g) --> SO3(g) H = -395kJ 2 SO2(g) + O2(g) --> 2 SO3(g) H = -198.2 kJ
November 14, 2011 by Anonymous

calculus
Find Mx, My, and (x, y) for the laminas of uniform density ρ bounded by the graphs of the equations. (Use rho for ρ as necessary.) x = −y x = 5y − y2
January 26, 2012 by sammyg

Math
Lee has 35 dimes and quarters that total $5.00. Solve the system of equations to find how many dimes and how many quarters he has. d+q=35 0.1d+0.25q=5 Please show your work thanks
February 25, 2012 by Sadie

8th grade math
How do you turn these equation into a standard form? this is the standard form: ax+by=c here are the following equations: 2x = y + 1/2 y - 2 = 1/4x + 1 3y + 3 = 6x - 15 Please help and explain. Thank you.
March 4, 2012 by saranghae12

science
Zinc chloride solution is poured into a solution of ammonium carbonate. need conventional, ionic and net ionic equations thanks
March 12, 2013 by Danny

precalc
There is a line with two rectangular pt (3, 4)&(6,-3)write this line as a pair of parametric equations then show how you can eliminate the paparameter to return to rectangular form
April 26, 2013 by brady

math
Jenny wanted to solve the quadratic equation x2 - 11x +18 = 0 by factoring. Which of the following equations would lead her to solve the given equation?
August 30, 2014 by cam

chemistry-chemical equations
How do I write the balanced chemical equation for Copper +nitric acid -> copper(II)nitrate+ nitrogen dioxide + water
November 30, 2014 by Anonymous

Science
Is this equation balanced or unbalanced? H3PO4 and H4P2O7+H2) The first equation has 3 Hydrogen, 1 Phosphorus, and 4 Oxygen. HOw do you find the second equations Oxygen?
January 8, 2015 by M

Straight Lines
how to find the equations of the lines if the equation of their angle bisectors are given and one of the line passes through a given point?
January 25, 2015 by Shanu

Mathematics
I have this question on tesselations, I got some homework and one of the questions are: A tesselation with the notation of schlafli of {3,3,4,4}. What formes are at the vertex. Draw a tesselation of it. I have been trying to figure this out for 30mins now and i just can't ...
February 7, 2007 by Stine

Chem Help!
I really need help for my homework on balancing equations please show all the work including the coeffients if needed. I need help with 3 questions, 1) NaN3 -> Na + N2 2) NO2 + O2 -> NO + 03 3) LiOH + CO2 -> Li2CO3 + H2O
March 15, 2008 by Tania

physics
if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered
February 28, 2011 by luna

Calculus
I'm a bit confused about the average equations with integration. I need to solve this problem, and I think I'm supposed to use substitution, but I can't get it to work. The problem looks like this: z(t)=4tsin(t^2), [0,π^1/2] Any input?
February 27, 2011 by Rachel

physics
if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered
February 28, 2011 by luna

MATH
you purchase 8 video game machines for a total of $2722. A nintendo costs $249 and an Xbox costs $395. How many nintendos and how many xboxes did you buy? What 2 equations do I write and how do i solve it? (elimination substituation etc.)
June 7, 2011 by HAILS

math
This weeks focus is on systems of equations. Describe a profession that might use this on a regular basis, and give an example with a solution (not covered in the text) of a math problem with a real-life application.
February 10, 2012 by Leo

Physics
A particle is acted upon two forces given by the vector equations, F1=1.5i-0.7j and F2=-3.1i+3.6j, with values measured in Newtons(N). Calculate the resultant force, in N, acting on the particle, giving your answer to 3 dec places.
March 5, 2012 by Annoymous

Math
The perimeter of a pool table is about 7.8m. Four times the length equals nine times the width. What are the dimensions? I need to find 2 equations first. I got 2l + 2w= 7.8 I cant seem to get the other one
September 16, 2012 by Vanessa

accounting
in order for companies to prepare and issue financial staements, their accounting equations (debit and credits) must be in balance at year end. Discuss how errors and misstatements may occur given this requirement.
October 15, 2012 by mya

accounting
in order for companies to prepare and issue financial staements, their accounting equations (debit and credits) must be in balance at year end. Discuss how errors and misstatements may occur given this requirement.
October 15, 2012 by mya

accounting
In order for companies to prepare and issue financial statements, their accounting equations (debits and credits) must be in balance at year end. Discuss how errors and misstatements may occur given this requirement
October 15, 2012 by mya

Differential Calc
If: 0 = f(1) = a+b+c+d 2 = f(-2) = -8a+4b-2c+d 0 = f'(1) = 3a+2b+c 0 = f'(-2) = 12a-4b+c "since we now have four equations and four unknowns, we can determine unique solution. Solving for "a" and "b", a=, b=" Please show the steps, I am so confused and no one knows how to do ...
November 5, 2012 by Joey

College Physics
The rectangular coils in a 201-turn generator are 14 cm by 17 cm. What is the maximum emf produced by this generator when it rotates with an angular speed of 525 rpm in a magnetic field of 0.81 T? I'm not sure what equations to use.
April 25, 2013 by Valerie

Chemistry
Please help me write these two balanced equations. Dissolution of rust, Fe2O3, by sulfuric acid. and Ammonium nitrite reacts with oxygen to form ammonium nitrate. Any help would be awesome, thankyou.
April 30, 2014 by Susan

precalculus
How many solutions will the following systems of equations have? x^2+y^2=10 x+y=4 a. infinite b. 0 c. 1 d. 2 I'm thinking A. but I just want to make sure. If you have an answer that is different could you possibly show me how you got it, it would really help me prepare for my ...
May 14, 2014 by Ally

please help
Donna opens a certificate of deposit (CD) with $2,000. The bank offers a 3% interest rate. If the account compounds quarterly, which of the following equations represents the future value of the account, after 1 year?
September 8, 2014 by jeannie

HELP!
The problem using elimination/substitution methods what is the solution set to 3x -2y =-4 and 5x=2y the choices a)(2,-5) b)(-2,-5) c)(2,5) d)(-2,5) Please, Please, Please, HELP! 3x-2y=-4 -5x +2y=0 add the equations, solve for x. That makes it a or c. Put that answer in the ...
January 16, 2007 by Anonymous

math
Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method? Which method do you like best? Why? What circumstances would cause you to use a different method?
July 1, 2008 by yolanda

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

Chemistry
I'm having a hard time balancing the following chemical equations: - F2 + NaOH -> O2 + NaF + H2O - Ca(AlO2)2 + HCl -> AlCL3 + CaCL2 + H2O - Ba(OH)2 + HNO3 -> BA(NO3)2 + H2O
April 18, 2009 by Sukie

Calc 2
Differential equations. There are gophers in a very large vacant lot. The original population is 30 Gophers. After 2 months there are 38. When will there be 45 gophers? round answer to nearest tenth of a month
July 9, 2010 by Scott

chemistry
Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)
July 3, 2011 by ABCD

Algebra
Since the opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since the opening night. On what day(S) was the ...
June 13, 2014 by This Girl

mathematics
The government intends to build 20 more schools in a bid to fulfill education for all, millennium development goal by 2015. This would steadily host 20 percent growth of enrollment rate by 2016. The current strength of teacher-pupil ratio is 1:60; and the number of enrollment ...
June 25, 2014 by Daka M

Polar Equations
Identify each polar equation by changing the equation to rectangular coordinates. Let t = theta (1) t = -pi/4 (2) r(sin(t)) = -2
February 23, 2008 by sharkman

graphing
Determine whether the graphs of the two lines are parallel. y+3=3x 6x-y=-3 Are the graphs of the given equations parallel?
April 20, 2008 by Shawn

Math
What properties are expressed in these equations? a=b a + [c + (-c)] = b + [c + (-c)] Also, would the property expressed in -a=-b be the substitution property of equality?
October 19, 2008 by Lilly

MATH
How do i solve the pair of simultaneous equations y=4-2x y=2x^2-3x+1 ?? how do i find minimum value of 2x^2-3x+1 and the value of x for which the minimum occurs???
June 17, 2009 by Aaliyah

math
Two circles of radius 4 are tangent to the graph y^2=4x at the point (1,2). Find the equations of the two circles.
October 14, 2009 by David

chemestry
balance the equations (single displacement) 1. zinc + Iron(II) Chlorine ----> 2. Zinc + Hydrogen Chlorine ---->
March 23, 2011 by celina

math
Express all the solutions to the following equations in a + bi form: (a) z^2 +2z+4 = 0 (b) z^3 −8 = 0 [Hint: z^3 −8 = (z−2)(z^2 +2z+4)] (c) 2z+iz = 3−i thank you!
April 22, 2011 by jane

parametric equations
On what intervals of t is the curve described by the given parametric equation concave up? Concave down? x=t^2; y=t^(3)+3t
April 16, 2013 by Mary

1 step and 2 step equations
Y+15-8.95 Y=6.05?? -62=y-87 Y=25? -y/7=18 14z=56
January 26, 2015 by kennedy

mathematics of investment
step by step solving plsss im very law in math so plss to solve step by step thanks.On August 1,1990, Mr.Talamos borrows 9,500 pesos and agrees to pay the compounded amont on the day he pays the debt. If interest is at the rate of 5 1/2% compounded quarterly, how much must Mr...
September 20, 2014 by BM

Mathematics
Q1.A man earn $1200 and spends $450 per month.Find ratio of (a)His income to his expenditure and (b)His savings to his income Q2.An open water tank with length 20 cm and width 15 cm holds 4.8 liters of water.calculate the height of the water level tank and the total surface ...
May 14, 2011 by Envy Green

algebra
Since opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. On what day(s) was the attendance ...
May 23, 2014 by Sacha

ALGEBRA
Please help...Since opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. On what day(s) was ...
January 25, 2015 by Anonymous

Math
Imagine you are in the market for a new home and are interested in a new housing community under construction in a different city. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one ...
January 27, 2011 by Anonymous

Algebra
One number is 6 more than another number and their sum is 2. How would i make that an equation thought. for example if the question was, Jane spent $42.00 for shoes. This was $14 less than twice what she spent for a blouse. How much was the blouse? the equation would be, 42= ...
January 20, 2007 by Steve

mathematics
The number of buds on the plant doubles every week for six weeks if there are two buds on the plant at the end of the first week calculate the number of buds that there will be at the end of six weeks
April 8, 2014 by Felicia motaung

combinatorical mathematics
At Brilli's zoo, she is trying to train a monkey to learn how to count. The monkey is given a stack of cards, numbered 1 to 30, in some random order. The cards are laid out from left to right. Each time the monkey moves the card numbered i+1 to the immediate right of the card ...
December 9, 2013 by Mark

Math
Which best describes the relationship between the lines with equations 8x+y=6 and 16x+2y=0 (a) perpendicular (b) parallel (c) same line (d) neither parallel nor perpendicular
September 4, 2007 by Bria

Geometry
Which best describes the relationship between the lines with equations -16x+2y=0 and -x-8y=-2? a. neither parallel nor perpendicular b. parallel c. same line d. perpendicular
October 26, 2007 by alan

chemistry
Could you help me complete these equations. I can balance them after NaOH (aq) + HI (aq) ---> LiHCO3 (aq) + HI (aq) ---> HCl (aq) + NaHCO3 (aq) --> Na2CO3 (aq) + HBr (aq) --> HNO3 (aq) + KHCO3 (aq) --> HBr (aq) + NH3 (aq) ---> HNO3 (aq) + Ca(OH)2 (aq--->
February 20, 2008 by Amy

12 chemistry
Write the balanced chemical equation for each reaction: K2MnO4(aq)+H2SO4(aq)+NaHSO3(aq)= ? K2MnO4(aq)+NaOH(aq)+NaHSO3(aq)= ? start with the net ionic equations.
September 28, 2009 by izzy

maths
decide whether the graphs of the two equations are parallel lines: 1. 2x+3y=5 9y+6x-1=0 answer: yes 2. 15+3x-10y=0 30x+24=10y answer: yes please check if this is right. thanks
October 8, 2009 by emma green

Math
Sarah is two-thirds as old as Jenny. Jenny is 7 years older than Sarah. Which system of equations could be used to find the girls ages? A. 3s 2j = 0 j 7 = s B. j = 2/3s s + 7 = j C. j 2/3 = s j s = 7 D. 2/3j = s j + 7 = s
October 15, 2009 by ilovepink

Chemistry
"For which of the following equations is the value of delta H equivalent to the bond enthalpy for the carbon-oxygen bond in carbon monoxide? A. CO(g)-> C(g) + O(g) B. CO(g)-> C(s) + O(g) C. CO(g)-> C(s) + 1/2 O2(g) d. CO(g)-> C(g) + 1/2 O2 (g)" I'm guessing that ...
April 7, 2010 by Stuck

Chemistry
Balance each of the following skeleton equations. C) C3H8 + O2 -> CO2 + H2O This one was a bit harder for me to balance out, but this is what I managed to do. C3H8 + O2 -> 3CO2 + 8H
July 11, 2010 by Derrick

chemistry
Write the relevant chemical equations that will allow you to separate the following cations : 1-Hg subscript 2 2-Cation 2+, 2-Pb2+, 2-NH subscript 4 cation + 5- MN2+, and Fe3+
March 6, 2011 by Anonymous

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

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