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September 3, 2015

Search: mathematics: algebra;equations

Number of results: 40,518

Pre-Calc/Trig...
Am i correct? It is possible for a system of linear equations to have no solutions. True <-- False i think it's true, if the lines are parallel?
October 3, 2014 by Anonymous

college chem
A 1.10g- sample contains only glucose and sucrose . When the sample is dissolved in water to a total solution volume of 25.0ML , the osmotic pressure of the solution is 3.78atm at 298K a.What is the percent by mass of glucose in the sample? b.What is the percent by mass of ...
January 25, 2010 by mm

math
Find the y-intercept and the x-intercept for the equations -6x+y=10
May 7, 2010 by lana

calculus
Solve the equations i) log2(x + 2) + log2 x = 3. ii) 25^x + 5^x+1 + 6 = 0.
July 26, 2011 by MSM

Geometry
Find the x- and y- intercepts for each equations. What is the x- and y- intercepts? y= -2x + 8
August 28, 2011 by Kara

math
5th grade math equations
September 25, 2012 by ericka

m
Solve the equations. (a) 2D + 3 = 13 D = _____ (b) 12E - 3 = 0 E = _____
December 21, 2012 by Regina M

engineering mathematics 1
your father wants to fence a rectangular area in your backyard for a garden. one side of the garden is along rhe edgeof the yard is already fenced, so you only need to build a new fence along the other 3 sides of rectangle. if you have 80 meter of fencing available, what ...
April 17, 2014 by athira

Social Psychology
“Self-concept differs from self-efficacy in that self-efficacy is a context-specific assessment of competence to perform a specific task […] A student may feel highly efficacious in mathematics but without the corresponding positive feelings in self-worth […]” (ibid, 561). ...
August 21, 2011 by Sharon

Mathematics
Express the Complex Number -1-i in polar form. how is complex no expressed in polar form? what is polar form of complex no? Please help
March 3, 2014 by Sykox

math
Consider the distribution of mathematics SAT scores of students in honors calculus at a liberal arts college. What would you expect the shape and variation of the distribution to be? A. Symmetric with little variation B. Symmetric with large variation C. Skewed right with ...
May 28, 2015 by scoobs2usa

PROBLEM SOLVING IN MATHEMATICS
there are two prime numbers between 100 and 199 such that the ten digits is a prime number, the ones digit is a prime number and the tens and ones digits taken together are a 2 digit prime number. find the sum of these 2 prime number.
October 6, 2011 by alya

Analytical chemistry
A dilute perchloric acid solution was standardized by dissolving 0.2445 g of primary standard sodium carbonate in 50 mL of the acid, boiling to eliminate CO2, and back-titrating with 4.13mL of dilute NaOH. In a seperate titration a 25mL portion of the acid required 26.88 mL of...
August 1, 2013 by Gloria

Physics
In 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 9, 2011 by Amelie

mathematics - sinusoidal curves
Owen is jumping on a trampoline. When his feet hit the deck of the trampoline, the material depresses to a minimum height of 2cm. On average, Owen is reaching a maximum height of 200cm every 10 seconds. Determine the equation of a sinusoidal function that would model this ...
May 5, 2012 by arnab

math
write an equation for the parabola with focus (1,3) and vetex (0,3) See the paragraph Analytic Geometry Equations. You will have a choice of equations, you did not state whether the axis of symettry was parallel to x or y axis. http://en.wikipedia.org/wiki/Parabola that was ...
August 12, 2007 by Marissa

PROBLEM SOLVING IN MATHEMATICS
the average age of a group of teachers and student is 20. the average age of the teachers is 35. the average age of the students is 15. what is the ratio number of teacher to number of students ?
October 13, 2011 by alya

algebra
An algebra book weighs 6 oz less than twice as much as a grammar book. If 5 algebra books weigh the same as 8 grammar books, how much does an algebra book weigh?
October 19, 2011 by Anonymous

Math (Fourier)
I want to self-study Fourier Transforms followed by signal analysis and Wavelets. I am considering buying the books: "Fourier Analysis: An Introduction" and "A First Course in Fourier Analysis". My question is, are these at my level or are they over my head? Are these books ...
August 21, 2009 by Sean

math
Solve the system of equations: x - y - z = 2 x + 2y - 2z = 3 3x - 2y - 4z = 5 I know how to do the whole process, but sometimes I make careless errors that I never catch when I go over my work. This is the answer I worked out: x = 5 y = 1 z = 2 could somebody please let me ...
May 5, 2008 by Jennifer

physics
If the angular quantities θ,ω,α were specified in terms of degrees rather than radians, how would the kinematics equations for uniformly accelerated rotational motion have to be altered?
April 11, 2010 by Charlie

calculus
Find the area under one arch of a cycloid described by the parametric equations x=3(2theta -sin2theta) & y=3(1-cos2theta) use 0 and pi for te limiting values of. A.9pi B.18pi C.27pi D.36pi
March 13, 2011 by anon

college chemistry
Guys i really need help in these three problems. If someone could explain how to do this i would appreciate it! complete and balance the following equations 1. SO3^2- + Cu^2+ --> SO4^2- + Cu^+ 2. Cr +Cu^2+ ---> CrO4^2- + Cu^+ 3. MnO2 + Ag^+ ---> MnO4^- + Ag
February 14, 2012 by Keisha

chem
Write balanced equations for the following reactions. (Use the lowest possible coefficients. Omit states-of-matter in your answer. 238 U 92 (á, n) 241 Pu 94 sorry teh formating is off
August 31, 2012 by sara

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response.
November 20, 2014 by Sarah

Earth Science
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response. THANKS
November 20, 2014 by Sarah

Algebra
A company has two printers. Printer A prints a pages per minute, and Printer B prints b pages per minute. When Printer A prints for 3 minutes and Printer B prints 5 minutes, a total of 70 pages are printed. When Printer A prints for 6 minutes and Printer B prints for 9 minutes...
March 31, 2013 by Angie

Mathematics
At football practice, players do a 20-minute warm-up before starting their practice drills. After the practice drills, they do a 10-minute cool-down. The expression 20+d+10 describes the length of practice, where d is the number of minutes the practice drills last. How long, ...
June 1, 2011 by HELP

MATH Prob.
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. a. The wealth of the parents of students attending your school b. The values that a group of fourth-grade students would give for the ...
August 11, 2009 by Twg

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 1A
describe what the graph of interval -4, 10 looks like? This is for math 166 algebra 1A I dont understand how to answer this question, please help me!
November 29, 2008 by Julissa

algebra
Since I am new to the algebra and do not fully understand it, I am not sure how to answer the following question. Hope you can help. thanks how do you know when an equation has infinitely many solutions
August 9, 2010 by Ziggy

Algebra 2
What is the slope of the line that passes through the points (-2, 4.15) and (1, 1.24)? Here's my work: m= y2-y1 / x2-x1 m+ 1.24-4.15 / 1 - (-2) m= -2.91/3 Is my answer correct? I really appreciate your help! Algebra isn't the easiest for me
September 4, 2013 by Josh

Math
I'm an on-going 8th grader, and I'm taking a class for Algebra 2. What should I expect that is different from Algebra 1? P.S. I've taken Geometry online.
June 8, 2014 by Sheenybeany

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

mathematics
1.)Sin^-1(x)+Sin^-1(y)+Sin^-1(z)= pie Prove that X.root(1-y^2)+y.root(1-x^2)+z.root(1-z^2)=2xyz 2.)tan^-1(yz/xr)+tan^-1(zx/yr)+tan^-1(xy/zr)=pie/4 Prove that x^2+y^2+z^2=r^2 Tomorrow is my exam.please give me answer as soon as possible.
May 23, 2013 by edward

mathematics
THE 1ST, 3RD AND 9TH TERM OF A LINEAR SEQUENCE A.P ARE THE 1ST THREE TIMES OF G.P. IF THE 7TH TERM OF THE LINEAR SEQUENCE IS 14. CALCULATE (A) 20TH TERM OF THE LINEAR SEQUENCE (B) SUM OF THE 1ST, 12TH TERM OF THE G.P
March 5, 2015 by AYOMIDEY

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

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

math
Sorry I'm posting again-- I just thought it would increase my chances of getting my question answered if i posted it in the mathematics portion of the website also. --------------------------------------- One can of pumpkin pie mix will make a pie of diameter 8 in. If two cans...
March 8, 2008 by Emily

MATHEMATICS
A piece of notebook paper is about 0.0032 inch thick. If you begin with a stack consisting of a single sheet and double the stack 25 times, how tall will the stack be in inches? How tall will it be in feet? (Hint: Write and solve an exponential equation to find the height of ...
April 8, 2012 by DAN

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

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

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

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

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

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

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

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
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

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!!

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 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

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

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

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

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

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