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August 4, 2015

Search: mathematics: algebra;equations

Number of results: 40,196

algebra
what do the words, "express m in terms of n" mean? which wors would be considered the input variable into the expression? algebra 1 homework
August 12, 2014 by Patti

elective mathematics
A ba contains 5 red and 4 white identical balls abd a second bag contains 3 red and white identical balls If one ball ios selected at random from each of the bags, Find the probability that, two balls selected will be of I)different colour Ii)same colour
April 30, 2014 by jerry johnson

Math
An instructor gives regular 20-point quizzes and 100-point exams in a mathematics course. Average scores for six students, given as ordered pairs (x,y) where x is the average quiz score and y is the average test score, are (18, 87), (10, 55), (19, 96), (16, 79), (13, 76), and...
March 7, 2011 by Re

College Algebra
a paper manufacturing company recycles paper, cans and other sheet metal. the profit on the paper is $500 and the profit on the cans is $350 per pound A) write the objective function that models the daily profit B) the manufacture is bound by the following constraints , ...
March 6, 2015 by meri

College Algebra
a paper manufacturing company recycles paper, cans and other sheet metal. the profit on the paper is $500 and the profit on the cans is $350 per pound A) write the objective function that models the daily profit B) the manufacture is bound by the following constraints , namely...
March 6, 2015 by meri

Algebra
Joe and Theresa want to paint their living room. From past experience they know that Joe can paint the room in 6 hours and Theresa can paint it in 10 hours. How long will it take them if they work together? Mower A can cut a field in 6 hours and Mower B cut the same field in 2...
March 5, 2014 by Chelsey

College Physics
n the approximation that the Earth is a sphere of uniform density, it can be shown that the gravitational force it exerts on a mass m inside the Earth at a distance r from the center is mg(r/R), where R is the radius of the Earth. (Note that at the the surface and at the ...
March 8, 2011 by Amelie

mathematics
Allan makes two payments a year of $337 each for real estate taxes. He makes six payments a year of $216 for auto insurance. How much must he budget monthly to cover these fixed expenses? 2 How much will it cost to mail a first-class letter that weighs 2.8 oz? The rate is $.22...
January 29, 2010 by sabina

science
Completing Equations of chemical changes: EXample: Al+02- Al2O3 How do Iidentify which type of reaction is taking lace and then balance by using coefficients and not subscripts to balance
October 3, 2007 by Danny

MATH
im doing solving radical equations how do i do the squareroot of x+1=x+1 the squareroot is only around the first x+1 i got to the part 0=x^2+x is this right and if it is do i factor it or use the quadratic equation. thnx for the help!!!
March 12, 2008 by gabster

math
My teacher said we are supossed to solve this using systems of equations: Let a, b, and c be real numbers such that a-7b+8c=4 and 8a+4b-c=7. Then a^2-b^2+c^2= ? can someone please help?! i don't know what method to use to solve this or where to start
September 13, 2009 by chrissy

mathhh!
My teacher said we are supossed to solve this using systems of equations: Let a, b, and c be real numbers such that a-7b+8c=4 and 8a+4b-c=7. Then a^2-b^2+c^2= ? can someone please help?! i don't know what method to use to solve this or where to start
September 13, 2009 by chrissy

math 116
After solving a system of linear equations, how can you check your answer to determine whether it is correct? Demonstrate the process of checking an answer with an example.
March 10, 2010 by earl

Lynn
What are some pros and cons of using each of the following methods when solving equations? -graphing -using substitution or elimination I hope to gain additional thoughts on this, thanks.
June 21, 2010 by Math (Algebra)

Calc 2 college
Modeling with differential equations. If a bacteria culture doubles every 10 minutes and the original culture has 300 cells determine the rate of growth.
July 9, 2010 by Marianne

WORD PROBLEMS WITH EQUATIONS
Mark has 28 10-cent and 20-cent pieces. How many of each coin does he have if their total value is $4.30? In a class of 26 students, there are four more than girls. How many boys are there?
May 1, 2011 by Maria

physics HELP
Im having problems getting the magnitude of the force in the problem i asked below i got the frictional and normal force please help me put these equations together
October 31, 2012 by Anthony

Chemistry
Heat 1kg of CaCO3, get 560g of CaO. Write the reactant equations and solve the mass of CO2 that born. The CaO is 100% pure. Anyone help me, pls?
August 29, 2013 by Melly

Pre-Calc/Trig
Complete the following for each system that involves one or more quadratic equations: Solve the system algebraically 7y^2-5x^2+20x=3 5x^2+21y^2=209
January 8, 2015 by Anonymous

i need help!!!!
There were 100 more balcony tickets then main-floor tickets sold for a concert. The balcony tickets sold for $4 and the main-floor tickets sold for $12. The total amount of sales for both types of tickets was $3,056. a. write an equations or a system of equations that ...
June 20, 2005 by casandra

Algebra
It does, thanks. I'm currently working on solving algebraic equations with two variables (Example: 3x+4y=9). The computer lesson has taught me nothing but to solve the equation by trial and error -- selecting the proper ordered pair from a multiple choice list after plugging ...
June 20, 2007 by Jack

Trigonometry
convert polar equations to rectangular coordinates. 1.) θ=π 2.) r=6 cos θ 3.) sec θ=2
April 28, 2011 by Kayla

math
Find the distance between the lines with equations 3x-y=9 and y=3x-4 a. 5/4 b. (5√10)/2 c. √10/2 d. (13√10)/2 not too sure on this one!
June 1, 2009 by sophie

equations with variables on both sides
the difference when 7 less than a number is subtracted from twice the number is 12. what it the number?
May 8, 2012 by Anonymous

math
slope = -2, passing through (0, -3) equations for each line point-slope, slope-intercept form
April 23, 2013 by Holli

Math
consider the equations:f(x)=-6x-1 and g(x)=4x^2 Select the solution for (f+g)(x) A) -6x-1+4x^2 B) -24x^3 - 4X^2 C) -24x^2 - 1 D) -6X -1 - 24X^2 I think the answer is A. Please help
November 24, 2013 by Maria

mathematics
What is the solution for this? The surface area of a sphere varies in direct proportion to the square of its radius. If a sphere of radius 6cm has a surface area of 452 square cm, find, to the nearest mm, the radius of a spherewith the surface area 1000 square cm.
October 29, 2011 by Richelle

Mathematics
A loan of $7,000,000 is being amortised over 48 months at an interest rate of 12% compounded monthly. Find: (a) the monthly payment; (b) the principal outstanding at the beginning of the 36th month; (c) the interest in the 36th payment; (d) the principal in the 36th payment ...
June 22, 2010 by Gibbons

Mathematics
A loan of $7,000,000 is being amortised over 48 months at an interest rate of 12% compounded monthly. Find: (a) the monthly payment; (b) the principal outstanding at the beginning of the 36th month; (c) the interest in the 36th payment; (d) the principal in the 36th payment ...
June 22, 2010 by Gibbons

Math
The sides of a triangle have the equations y=-1/2x+1, y=2x-4, and y=-3x-9. Verify that the triangle is an isosceles right triangle. Algebraic solutions only!
March 17, 2010 by Kristen

Differenctial equations
Use the change of variable x = exp(s) to recast the differential equation xy′′+y′+(L/x)y=0 Please HELP ME
October 14, 2011 by lili

math quadratic equations
a) expand and simplify: (4x-3)(x+1) i get 4x^2+x-3 ? b) factorise: 2x^2 + 13x + 15 c) find y-int, x-int and vertex of: y= x^2-3x-4 i get y-int = -4, but loose it from there :(
May 25, 2014 by Kiirsty

environmental science
Please check this: Scientists use statistics to a. graph data b. analyze data c. communicate ideas to each other d. all of the above B ( in my book it says: scientists rely on and use statistics to summarize, characterize, analyze, and compare data. statistics is usually a ...
August 27, 2009 by y912f

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

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
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!!

Mathematics
If cosA is equal to 12/13 where 0 degrees is less than A less than 90 degrees, then tanA is equal to 3/4 where 0 degrees is less than A less than 90 degrees. Determine the ff: Sin2A
April 7, 2013 by Lungelo masuku

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

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

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 - 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
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!

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

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

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

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
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

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

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
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

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