Search: mathematics: algebra;equations

Number of results: 71,022

mathematical
Having mathematical standards in grades K-12 will give students clear and realistic expectations of what they are expected to learn in mathematics. The following solution explains this importance for students as well as the impact standards have on what teachers teach
Tuesday, March 15, 2011 at 11:28am by Anonymous

Mathematics
The suggested retail price of a new car is p dollars. The dealership advertised a factory rebate of $1200 and an 8% discount. How would I write the function R in terms of p giving the cost of the car after receiving the rebate from the factory?
Wednesday, February 9, 2011 at 5:45pm by Steve

Mathematics: Pre-cal
Consider a rectangular bathtub whose base is 12 ft^2. At what rate is water pouring into the tub if the water level rises at a rate of 0.9 ft/min? Please show steps. (I want to know how)
Tuesday, June 29, 2010 at 1:29pm by Rebecca

mathematics
I will assume you mean 2 2/3 + (1 1/5)÷(6 2/5) = 8/3 + (6/5)÷(32/5) = 8/3 + (6/5)(5/32) = 8/3 + 3/16 = 128/48 + 9/48 = 137/48 or 2 41/48 BTW, I cut-and-pasted your question into the google search window and it gave me the decimal equivalent of my answer.
Saturday, June 13, 2009 at 8:57pm by Reiny

math HARD
What is the general formula for the factorial notation? Hmmmm. Hard? n!= 1*2*3*4*...*n-1*n I have been missing from school and we have just learned it. So I am not very good at it. There is quite a lot on Wikipedia /wiki/Factorial Which includes the general formula and a ...
Saturday, March 31, 2007 at 9:39am by george

PreCalc (still confused)
Hello and Happy Halloween! Trying to get this problem and could use some help. Find the dimensions of the rectangle with minimum perimeter if its area is 400 square meters. Find the least perimeter. I know that a rectangle has two sides that are equal and two other sides that ...
Sunday, November 1, 2009 at 1:01pm by Muffy

ALGEBRA
auren and Andrew left Austin at the same time. Lauren traveled east at an average speed of 50 miles per hour. Andrew traveled west at an average speed of 65 miles per hour. How many hours of driving does it take for the two to be at least 500 miles apart? Write an inequality ...
Wednesday, May 26, 2010 at 6:10pm by Steven

algebra
What are the intercepting points of y^2=-4x and x^2=y I set both equations equal to 0, but only get x=0 and there is another intercepting point. please help! Graphically, y=x^2 is positive for all values of x, whether positive or negative. The second equation is y positive for...
Thursday, December 7, 2006 at 4:48pm by mary

mathematics
4 sin^2 = 1 - 2cos + cos^2 4 - 4 cos^2 = 1 - 2cos + cos^2 5cos^2 - 2cos - 3 = 0 cosx = 1 or -.6 x = 0 or 126.86°
Monday, December 5, 2011 at 6:17pm by Steve

chemistry
First mistake. 3.78 = M*0.08205*298 Solve for M. Then M = moles/L L = 0.025, not 24.45. Then you solve two simultaneous equations which I set up earlier. It becomes a math problem then, and not a chemistry problem. I assume you know how to solve two equations simultaneously. (...
Sunday, January 24, 2010 at 11:30pm by DrBob222

Intermediate Algebra
the first two questions form the basics of this topic on quadratic equations. If you cannot determine the vertex from y = -5(x+4)^2-4 I think you are in deep trouble. #3 is done for you, do #4 the same way #5 (27x^2y^3)^-3/4 = 1/(27x^2y^3)^+3/4 any more "simplification&...
Friday, April 4, 2008 at 8:10am by Reiny

AED
What skills will you teach and how will you teach them in mathematics. need 200 words and all I have so far is: I can teach this concept to students in a lower elementary grade and to students in a middle school grade by
Friday, November 21, 2008 at 10:19pm by troyer0269

Mathematics
If a piece of wood is 5 cm longer than a second piece, and 3/4 of the second piece is equal to 3/5 of the first, what is the length of the second piece? Explain your workings
Wednesday, November 9, 2011 at 9:27am by Jessica

Math 10 x-intersept y-intersept
x-intercept means when the line intersect with the x-axis, at that point the value of y is 0. y-intercept is the other way around, so the value of x = 0 so for you question: 1) x-intercept when y=0, so you just need to substitute y = 0 to the equations and solve for x. 2) y-...
Sunday, March 29, 2009 at 4:32pm by no name

8th grade
(1) c = 3d - 27 (2) 4d + 10c = 120 there are several ways to solve this problem (system of linear equations),, but in this case, we substitution method since in equation (1), variable c is expressed in terms of the other variable d,, we then substitute c from equation (1) to ...
Tuesday, October 26, 2010 at 9:39pm by jai

Math: Integration
These conditions must be satisfied: 6 = a*2^2 + b*2 + c = 4a + 2b + c 16 = 9a + 3b + c dy/dx @ P = 2a*2 + b = 4a + b = 7 Solve those three equations in 3 unknowns. It does not require integral calculus. 4a + 2b + c = 6 4a + b = 7 Combine these two to get b + c = -1 36a + 12 b...
Monday, February 16, 2009 at 6:11am by drwls

College Algebra
(I am not sure how to get the y value for part C and the whole part D) (I answered a couple of them but am not confident on my answers, so can you please tell me if my answers are not correct to the ones I answered and for the ones I haven not answered that is because I do not...
Wednesday, November 18, 2009 at 7:42pm by LeAnn/Please help me

Chemistry 2
A mixture containing KCLO3, K2CO3, KHCO3, and KCL was heated, producing CO2, O2, and H2O (water) gases according following equations: 2KCLO3 -> 2KCL + O2 2KHCO3 -> K2O + H2O + 2CO2 2CO3 -> K2O + CO2 The KCL does not reacnder the conditions of the reaction...
Thursday, September 13, 2007 at 6:22pm by Pat

GK or Dr.Bob222...Chemistry please help...
I don't have that equation. Is yours balanced? I don't think so. The atoms balance but the charge does not. You have -4 charge on the left and -2 on the right side. In addition the loss and gain of electrons is not the same. I tried to find the initial posting where GK...
Thursday, October 23, 2008 at 6:30pm by DrBob222

mathematics
if s is the side of the square, the s is the diameter of the circle area circle=PI(s/2)^2 area you want=s^2 -PI(s^2/4)
Sunday, May 19, 2013 at 6:25pm by bobpursley

Mathematics
let the investment be P P(1.01)^30 = 11305 P = 11305/1.01^30 = 8387.44
Monday, March 26, 2012 at 11:03am by Reiny

Mathematics
Let the original fraction be x/(x+2) (x+3)/(x+5) = x/(x+2) + 0.15 Solve for x. Try x = 3, 6/8 = 3/5 + 0.15 It works! So the original fraction is 3/5.
Saturday, October 22, 2011 at 1:01am by drwls

consumer mathematics
840 - 714 = 126 126/840 = 0.15 = 15%
Sunday, April 24, 2011 at 2:49pm by Ms. Sue

Chemistry
The answer I gave you is in fact correct. I just had a course in numerical mathematics, and because you are working with very small numbers (in the order of 10^-5), there can be relatively large errors when you plug in the solution for x in the equation. Note however that the ...
Saturday, January 19, 2008 at 5:50am by Christiaan

Math
ARRGHHHH!!!! Unless you are studying Computer Science and are working in base 2, 8 or 16, tell your teacher to quit teaching this silly stuff and get back to real Mathematics. Tell him/her that an old mathteacher with over 33 years experience said so. (sorry about the ...
Monday, January 7, 2008 at 8:45pm by Reiny

math
A bus leaves a station at 1 p.m, travling at an average rate of 44 mi/h. One hour later a second bus leaves the same station, travling east at a rate of 48 mi/h. At what time will the two buses be 274mi. apart? Set up two equations as I did in the two previous problems. Let us...
Monday, March 19, 2007 at 11:10am by cheryl

Math - addendum
In a system of 2 linear equations in two unknowns, each equation represents a straight line. Three situation can happen: case 1. When the two lines intersect each other at a point with coordinates x0 and y0. This means that the equations give a unique solution, x=x0, and y=y0...
Wednesday, August 10, 2011 at 5:56pm by MathMate

Algebra
Solve each literal equations for the indicated variable D = C - s/n ( for s) s/n = D - C Next, multiply both sides of the above equation by n, to get the equation for s. i dont understand could you type it how it looks This is an example Tammy If you have z/b = x + y and you ...
Saturday, July 8, 2006 at 12:16am by Tammy Evert

science
i know the steps but i still cant seem to write skeleton equations and balance them. can you help http://www.google.com/search?as_q=%22balancing+equations%22&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&...
Wednesday, March 28, 2007 at 11:37am by nelson

Algebra
(I am not sure how to get the y value for part C and the whole part D) (I answered a couple of them but am not confident on my answers, so can you please tell me if my answers are not correct to the ones I answered and for the ones I haven not answered that is because I do not...
Wednesday, November 18, 2009 at 7:04pm by LeAnn/I still need help

for Drbob222
You have TWO unknowns, both p and g, You must have two equations. The idea here is to MAKE one equations what it needs to be to zero out one of the unknowns. By multiplying equation 2 by 2, I get 2x2 = 4, then by multiplying by -1, I get -4p and you can see that -4p and +4p (...
Monday, October 29, 2007 at 4:47pm by DrBob222

COLLEGE MATH- SYSTEMS OF EQUATIONS
1. Solve these systems of equations a. 3x + 6y + 3z= 3 2x - y + 4z= 14 x + 10y + 8z= -8 b. x + y + 3z= 10 x + 2y + 3z= 4 x + 4y + 3z= -6 2. Solve these systems of equations word problems. a. A movie theater sold 450 tickets to a movie. Adult tickets cost $8 and children's ...
Sunday, January 29, 2012 at 5:45pm by LimaBeans93

college mathematics
In Exercises 13–32, determine whether the argument is valid or invalid. You may compare the argument to a standard form, given on page 155, or use a truth table. x→y ∼ x ∴∼ y there is suppose to be a line between x and the bottom y.
Friday, February 3, 2012 at 3:17pm by cody

mathematics
1. area of a triangle having autitude=7 cm and bass= 4 cm is : ??? 2. supplimentry angle of 84: ?? 3. a boy is asked to run 12 times around a rectangular field measuring 35m by25m find the total distance boy ran. Thanks
Wednesday, May 12, 2010 at 2:05pm by rebecca bhutto

Math
A long long time ago when I was teaching and we still had time to do some strange mathematics, we compiled a list of unusual factoring patterns. one of them was this x^3 + y^3 + z^3 - 3xyz = (x+y+z)(x^2 + y^2 + z^2 - xy - xz - yz) isn't that the pattern you see in the ...
Monday, May 25, 2009 at 4:20pm by Reiny

equations of tangents and normals
hi, i'd really appreciate some help solving this question! I am completely at loss here :/ The question is to: Find the equation of the normal to y=loge(x+2) which is parallel to the line with equation y+3x-5=0 I am fine at solving these sorts of equations when they give ...
Sunday, May 20, 2007 at 7:10am by elle

Mathematics
you would subtract 3 from each colour which would give you 5 red 6 blue and 7 green and all those added up would be how much marbles you should take in total to give you 3 of the same colour
Sunday, September 30, 2012 at 5:42pm by anoymunus

Mathematics
Eggs cost 90 cents a dozen. Peppers cost 20 cents each An omelette consist of 3 eggs and a quarter pepper what is the cost of ingredients for 8 omelets SHOW ALL WORKING
Tuesday, November 17, 2009 at 8:30pm by Ashley-ann

Algebra
43. For every real number x, y, and z, the statement (x-y)z = xz - yz is ________ true a. always b. sometimes c. never No idea.. 45. True or False: All equations give only one number as an output for every input number. False? 46. In which quadrant or on which axis would you ...
Thursday, May 13, 2010 at 8:38am by mysterychicken

algebra
a. x+y=56 is correct b. "there are three times as many homes available with the second floor plan than the first" means: number of homes with the second floor plan is greater than that of the first, in the proportion y = 3x, or 3x - y = 0 c. the system of equations ...
Tuesday, June 21, 2011 at 11:46am by MathMate

Algebra 1
I assume the two equations are as follows: 4x-12y=5 and -x+3y=-1 ============== To solve by substitution, take either equation, I'll take #2, and solve for either x or y. I'll solve for x, so -x + 3Y = -1 -x = -1-3y multiply through by -1 to give x=1+3y. Now that value...
Sunday, September 2, 2007 at 4:23pm by DrBob222

survey of mathematics
Search the internet to find a current article (published within january or february 2013 ) that provides statistical information relating to public policy and which you think is misleading. Explain why you feel the statistical information is misleading.
Monday, February 25, 2013 at 11:47am by gul

Mathematics
karen exchanged BDS$ two thousand dollars and received EC$ two thousand seven hundred calculate the value of one BD$ in EC$ I would just like the formula so i can work it out please
Tuesday, June 26, 2012 at 12:09pm by INDIANA

Mathematics
Combine the terms on the left to get 4*27*x^5 = 108 x^5 Set that equal to 3.548*10^82 = 354.8*10^80 Now take the 1/5 root (0.2 power)of each side 2.5509 x = 3.2359*10^16 x = 1.2685*10^16
Wednesday, February 27, 2008 at 4:20pm by drwls

Mathematics-please help!
A piece of wire 168cm. long is to be cut into two pieces, each to be bent to make a square. The lenght of a side of one square is to be 2cm. greater than the lenght of aside of the other. What is the area of the smaller square? Ans= 80
Saturday, June 9, 2012 at 10:35pm by Jeconiah

discrete mathematics
problem has to do with three valued logic, ie the values 1, 1/2, 0 interpreted as true, unknown, and false. i need to establish the connectives for the 3 valued logic, construct truth tables for the negation, conjunction, disjunction, the conditional, and biconditional. not ...
Wednesday, June 6, 2012 at 2:49am by anthony

AED
How do classroom management issues differ, depending on the subject matter? For instance, how can you manage an English lang. arts or social studies classroom differently than you can a mathematics or science classroom? Math and science you can do experiments and the other two...
Sunday, November 30, 2008 at 2:09pm by troyer0269

Algebra
4x-9y=4 6x+15y=-13 To solve, first isolate x (or y) in one of the equations. 4x = 4 + 9y x = 1 + 2.25y Substitute the right hand portion for x in the second equation. 6(1 + 2.25y) + 15y = -13 Solve for y. Put that value into the first equation to solve for x. To check, put ...
Sunday, March 15, 2009 at 10:02pm by PsyDAG

Algebra
The Nutty Professor sells cashews for $6.75 per pound and Brazil nuts for $5.00 per pound. How much of each type should be used to make a 50-lb mixture that sells for $5.70 per pound? c = lbs of cashews b = lbs of brazil nuts Are these the right equations? b + c = 50 6.75b + ...
Friday, February 20, 2009 at 5:26pm by Valeria

MaTh = Algebra = help
Oh so You have to multiply it by -2 because the first equation also uses -2 and you have to cancel them out that way right? So if its - and + that means you have to add the equations. If its - and - that means you have to subtract and if it's + and + that also means you ...
Monday, January 17, 2011 at 8:51pm by Rihanna

Mathematics
Ellen is 11 years older than Maja. Last year Ellen was twice as old as Maja. How old is Maja now?
Monday, May 13, 2013 at 8:02pm by Anonymous

Mathematics 1
0.2Sr = 7 Sr = 35 Students remaining. 0.3S = 35 S = 35 / 0.3 = 116.7 or 116 Students tried their luck.
Thursday, July 19, 2012 at 10:43pm by Henry

Algerbra
regular dinner = 2 tacos & 3 enchailada for 2.39 special dinner = 3 tacos & 4 enchiladas for 4.23 what is the average price for a taco & enchilada? Let t be tacos and e be enchiladas. A regular dinner would be represented as: 2t + 3e = 2.39 and a special dinner ...
Wednesday, January 10, 2007 at 8:02pm by Lea

Algebra
The perimeter of an equilateral triangle is 7 in. more than the perimeter of a square. The side of the triangle is 5 in. longer than the side of the square. Find the length of each side of the triangle. (Note: An equilateral triangle has all sides equal) Please help! Let x be ...
Thursday, August 16, 2007 at 10:25pm by Jodi

Physics
Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe. Which of the following equations describe the condition for observing the fourth dark ...
Thursday, January 24, 2013 at 3:28pm by confused

Fractional Exponent (Math-II)
A mathematics teacher bought a birthday cake for his son with the dedication Happy Birthday!!! (2 raise to 5/2 .(the dot means times) 2 raise to 3/4 divided by 2 raise to 1/4)th How old is his son? kindly help me...
Sunday, December 16, 2012 at 5:45am by jezzaD.

Fractional Exponent (Math-II)
A mathematics teacher bought a birthday cake for his son with the dedication Happy (2 raise to 5/2 .(the dot means times) 2 raise to 3/4 divided by 2 raise to 1/4) Birthday!!! How old is his son? kindly help me...
Sunday, December 16, 2012 at 5:43am by jezzaD.

Mathematics
Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?
Tuesday, September 25, 2012 at 11:51pm by Jennifer

Mathematics
A motorist do does the first part of his journey at an average speed of 54km/h. Then he increases the speed to 60km/h for the rest of the journey. If he travels 225km in 4 hours, what is the distance traveled for the rest of his journey? show clear steps.
Wednesday, March 7, 2012 at 12:34am by Fatima

algebra
costA=50+.25(total-50) costB=150+.20(total-150) so costB<costA put the equations in, and solve for total 50+.25T-12.5<150+.2T-30 .05T<150-30-50+12.5 T<82.5/.05 T<1650 check that.
Friday, August 26, 2011 at 4:57pm by bobpursley

Algebra Question
If the numbers are reasonably small the first thing I try is factoring If the coefficient of the square term is 1, and the middle term is even, then completing the square works great For all other cases I simply use the quadratic formula, knowing that it always works. One of ...
Thursday, January 29, 2009 at 6:53pm by Reiny

Physics
For an elastic collision, both kinetic energy and momentum are conserved. Conservation of momentum m(He)*v(He,initial) = m(He)*v(He,final) + m(H)*v(H) where m(He) is the mass of the Helium, v(He, inital) is the initial speed of the Helium , etc. . . Conservation of kinetic ...
Wednesday, November 28, 2012 at 7:23pm by Jennifer

Quadratic equations from standard to factored
c, is difference of two squares. b. (2x-3)(x+1) a. (x+5)(x+2)
Sunday, May 19, 2013 at 5:51pm by bobpursley

advanced algedra 2
Factor the following quatric equations: a) x^4-9x^2+18
Sunday, May 19, 2013 at 3:29pm by Tiara

advanced algedra 2
Factor the following quatric equations: a) x^4-9x^2+18
Sunday, May 19, 2013 at 1:56pm by Tiara

Math
find the equations of the three perpendicular bisectors of the sides of triangle qrs.
Tuesday, May 7, 2013 at 9:13pm by J.J

Math
Solve for the following system of equAtions for y: 2x + y = 10 3x =y
Thursday, April 18, 2013 at 8:17pm by Morg

math,science
In the Lotka-Volterra competition equations, if a21 > 1, then:
Tuesday, April 16, 2013 at 1:08pm by tg

Parametric Equations
Convert to a rectangular equation by eliminating the parameter: x=(1/t) y=2t+3
Saturday, April 13, 2013 at 10:41pm by Molly

math help
consider the equations: f(x)= -6x-1 and g(x)= 4x^2 select the solution for (fg)(x)
Sunday, March 31, 2013 at 9:05am by Anonymous

math
Consider the equations: f(X)= -6x-1 and g(x)=4x^2 Select the solution for (fg)(x).
Sunday, March 31, 2013 at 12:48am by Anonymous

Trig
so, what's the problem? Divide the equation in two and make new equations.
Tuesday, March 12, 2013 at 1:56am by Steve

math
solve the system of equations in three variables -3x+y-z=-10
Thursday, March 7, 2013 at 3:48pm by Laura

calculas
Write following equations in polar coordinate then graph them Y=4X
Tuesday, March 5, 2013 at 7:37pm by preet

math quiz tomorrow
I am having problem graphing with these two equations 2(3^x)-3 and –3(3^–x)
Tuesday, February 19, 2013 at 6:00pm by Tristan

Math
How would I solve equations with variables on both sides? Please help!
Monday, February 11, 2013 at 7:18pm by Tanner

math
solve the equations by finding the exact solution this is question from log 3=x-3
Sunday, February 10, 2013 at 9:56pm by Andrzej

math
Solve the following systems of equations. 3x + 4y = 4 2x + y = 6
Tuesday, February 5, 2013 at 12:25pm by diana

Differential Equations
If y(t) depends on what C is, then how this equation doesn't contradict the uniqueness theorem if it has many solutions?
Thursday, January 31, 2013 at 3:41pm by Erica

math
Identify the solution(s) of the system of equations, if any. X + 2y = 4 9x – 4y = 3 a) (1, 2/3) b) (1, 3/2) c) (2/3, 1) d) (3/2,1)
Sunday, January 27, 2013 at 4:39pm by monet

math
Identify the solution(s) of the system of equations, if any. 2x + 5y =10 Y = 2 – x a) (-2,0) b) (2,0) c) (0,-2) d) (0,2)
Sunday, January 27, 2013 at 4:38pm by monet

Math
Find the Pythagorean triple with the following equations: m=2, n=3... I'm thinking its a no solution?
Monday, January 14, 2013 at 4:36pm by Millie

Algr 1
When your graphing linear equations the rate of change can be the same as?
Sunday, December 9, 2012 at 4:05pm by broko NY

Math
Determine the slope and the y-intercept of the following linear equations. 1. y = (3/2)x - 4 2. 2x + y - 3 = 0
Friday, November 30, 2012 at 12:09am by Milen

math
Write a quadractic equation having given equations? -9,9i
Thursday, November 15, 2012 at 2:54pm by tan

math
x + y = 5.3 x - y = 1.7 So add the equations together: 2x = 7.0 x = 3.5 But x + y = 5.3, so y = 1.8 Check it: x times y = 6.3. Correct!
Wednesday, September 26, 2012 at 6:15pm by David Q/R

Differential Equations
oh, never mind. I've seen my mistake. disregard this question.
Tuesday, September 25, 2012 at 3:05am by Bryant

math
can you give me at least 5 pythagorean triple theorem equations please
Monday, September 10, 2012 at 5:22pm by Quita

Algebra2
Rational Exponet Equations: Help? 1.(x^2+9x+22)^3/2 = 8 2.(5x-5)^2/3 = 16
Wednesday, August 22, 2012 at 6:54am by Sam'

math
Sketch the curve represented by the parametric equations x = 3cos and y = 3sin for 0 .
Monday, August 13, 2012 at 10:39pm by Anonymous

Math
Given These Equations x+y=9.0 .50x+.20y=3.90 Find the values of X and Y.
Saturday, July 14, 2012 at 6:47pm by Jenny

Physics
I understand but you didn't put 10(initial height) into any of the equations?
Saturday, July 14, 2012 at 12:10am by Zac

Calculus
Write a vector equation AND parametric equations of the line through the points A(6,-1,5) and B(-2,-3,6)
Wednesday, May 9, 2012 at 1:31am by J

math
rearrange things a bit and it's clear the equations are the same. So, what does that mean?
Friday, May 4, 2012 at 3:01pm by Steve

MATH
Add the two equations. 2x-y=0 3x+y=5 5x = 5 Solve for x, then y.
Thursday, May 3, 2012 at 3:00pm by PsyDAG

math
There are infinitely many solutions, since the equations represent the same line.
Wednesday, May 2, 2012 at 2:45pm by Steve

Math-URGENT!!!!
write the parametric equations of -3x+1/2y=2/3. please help me!!!
Monday, April 30, 2012 at 1:01pm by Tabby

math
solve the system of linear equations 2x+2y=1 3x-y=6 thanks
Saturday, April 7, 2012 at 9:02pm by sandra

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