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mathematics: algebra;equations

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Algebra
when writing linear equations, how do you determine which form of a line to use? choose 1 set of points from the choices below. then, solve the problem and post your solution, showing your steps. write an equation in point-slope form for the line that passes through one of the...

algebra
Is there a site or someone who can help me, im not getting the basic algebra...I need someone or a web site that will help me understand the basics of algebra. PLZ HELP Im in 8th grade

Algebra
Use a system of equations to solve the following problem. The local theater has three types of seats for Broadway plays: main floor, balcony, and mezzanine. Main floor tickets are $59, balcony tickets are $50, and mezzanine tickets are $40. One particular night, sales totaled...

Mathematics
The opposite of -4 is 4.•• -4. -(-(-4)). -|4|. The opposite of -10 is -(-(-10)). -10. 10.•• -|10|.

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.

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?

Mathematics
Find the number of pairs of non-negative integers (n,m), such that 1≤n<m≤100, n∣m^2−1 and m∣n^2−1. Details and assumptions The notation a∣b means a divides b, or b=ka for some integer k.

mathematics
The population of a town decreases by 4% annually from the number at the end of the previous year. Calculate after how many years it will take the population to reach 21578 if the population had 38756 inhabitants during previous year.

Discrete Mathematics
A 24 pack of soda costs $8 each and bags of chips cost $6 each. You have $120 to spend and there is a 16 items or fewer fast lane open. How many sodas should you purchase to spend all the money and be able to use that fast lane?

Mathematics
An open box is made from a square piece of sheet metal 19 inches on a side by cutting identical squares from the corners and turning up the sides. Express the volume of the box, V, as a function of the length of the side of the square cut from each corner, x. A. V(x) = 361x B...

mathematics
Cand D are two observation posts on the same horizontal ground at the foot A of a vertical tower AB.the tower is 18m due north of D and 24m east of C.the angle of elevation of B from D is 35¡ã.calculate to three s.f the height AB,distance CD,angle of elevation from C,bearing...

Mathematics
F(x, y) represents a velocity field of a fluid over a surface S defined by z = 6 − 3x − 2y. If the magnitude of the velocity in the direction of the unit normal vector, n̂, on S is 3z⁄√14, compute the flux of F(x, y) over the surface S in the first octant oriented ...

Chemistry
Deriving Chem Beer's Law's Equation By comparing the absorbance of each trial solution, Aeq, to the absorbance of the standard solution, Astd, [FeNCS2+]eq can be determined. Two Beer’s Law equations can be written, one for the trial (Aeq = ε[FeNCS2+]eql), one for the ...

CONTEMPORARY MATHEMATICS FOR BUSINESS & CONSUMERS
Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month?

mathematics
thabo is x years old and lizzie is y years old write down algebraic expression for a) thabo's age in 6 years time

mathematics
john is 4 years older than david and joe is 2 years younger than david . if the sum of their ages is 41. how old will john be in 8 years time?

Mathematics
A project has the following NPV at the following discount rates. D.r (%) NPV($) 4 22800000 5 16200000 6 7200000 7 -1350000 8 - 6900000 Estimate the IRR on the project. Suppose the money could be invested elsewhere at a rate of 8%, should the project be undertaken?

Mathematics
Patrick has a summer job passing out flyers for a store. Each flyer weighs about 0.55 ounce. If he is given a bundle of flyers that weighs 16.5 Ibs , how many flyers must he pass out ? [ Help or Answers are appreciated greatly. Thank you. ]

mathematics
In one year one dollar $1 could be exchanged for one Euro and twenty cents A .. derive a formula to exchange dollars into euros. B.. use your formula to work out how many euros you would receive for $250

math
its about phones like att has a monthly fee of $39.99/mo and 450 anytime minutes which are included in the plan and any additional minutes are $0.45/min Sprint-has a monthly fee $34.99/mo and 450 anytime minutes which are included in the plan and any additional minutes are $0....

College Algebra
In an assembly line of a factory, which produces networking switching hubs, two robots are utilized. The first one (A) is able to produce 40 microchips per hour, whereas the second one (B) produces 30 microchips per hour. For a total production of 400 microchips, the two ...

7th grade
There are at least 5 more than twice as many students taking algebra 1 than taking algebra 2. If there are 44 students taking algebra 2, what is the least number of students who could be taking algebra 1. Show all work

Physics
Please can you help out: 1)The Potential diff across the terminals of a battery is 8.5v when there is a current of 3amps in the cct from the -ve to the +ve terminal. When the current is 2amps in the reverse direction, the potential diff becomes 11volts. a) what is the internal...

Mathematics
Jake's car needs repairs but he is short of cash. A payday loan company charges a fee of 46 for a two week loan of 250. This is equivalent to a discounted loan with proceeds of 250 and a loan amount of 296. What is the per annum interest rate?

essential Mathematics
if on the first of january a savings account has a balance of $3,200, what amount will be there in this account after three years if the bank gives 6% per year interest compounded quarterly? (assume that there are no deposits or withdraws of money during these three years.

business mathematics
Check My Work (No more tries available) The Book Nook makes four times as much revenue on paperback books as on hardcover books. If last month's sales totaled $124,300, how much was sold of each type book?

Mathematics
If Z= [tan 2x -i(sin x+cos x)]/[1+i sin x] is completely imaginary, find x.(0<=x<=(pi/2) ) I understand that here we have to equate the real part to 0,but how do we isolate the real part.I tried multi plying both numerator and denominator by (1-2isinx),but it doesn't ...

algebra
These are very easy to set up with a "chart" ---------Distance-----Rate---Time (D=RxT) slow way --6x----------x-------6 fast way - 5(x+7)-----x+7------5 so 6x = 5(x+7) 6x=5x+35+ x=35 The speed on the slower trip was 35 mph, and on the return trip 42 mph A consultant traveled 6...

economics
Assume that the equation for demand for bread at a small bakery is Qd = 60 - 10Pb + 3Y, where Qd is the quantity of bread demanded in loaves, Pb is the price of bread in dollars per loaf, and Y is the average income in the town in thousands of dollars. Assume also that the ...

Math Help Please
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 Where are the inequalities? Those are equations.

Physical Science
Balancing Equations Al+N2-->AlN NH4NO3-->N2O+H2O Pb(NO3)2+HCl-->PbCl2+HNO3

Chemistry
Write balanced equations showing how HBr and SO2 are consumed in a gas trap containing NaOH.

Calculus
I'm having trouble with this one. Problem: Find the equations for the planes parallel to x+2y-2z=1 and two units away from it.

English/Language Arts
In Tom Godwin's Cold Equations (short story), what writing style does he use?

Math:Calculus
Determine vector and parametric equations for the plane containing the point P0(1, -2, 3) and having direction vectors a= (4, -2, 5) and b = (-3, 3, 7). Thanks for the help.

math
i am in 3rd grade and we are learning about equations. I was not in class when she went over the steps. I need help. y+3=6X2

Please help--Geometric series
I need to find the equations of the following, using Ó (and the n=1 which is at the bottom of the Ó) (and infinity is at the top of the Ó) 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 + 144/16...

Math
Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?

math
bobpursley, I am confused to the equations that you have just posted. However, this is what I figured out but I'm not if it's correct. ((25+R)-B)+3N=435

chemistry
Arrrg!!! i don't understand how you figure out when balancing equations how many moles of something are needed to make it balanced

Math
When solving exponential equations using logarithms. How would you sold one that has a fraction as the exponent such as: x^(1/4)-81=0

math
Solve the system of equations by Elimination OR Substitution. Explain why you chose one method over the other. 3x – 2y = 8 2x + 5y = -1

Chemistry
Write the 12 mole ratios that can be derived from the equations for the combustion of isopropyl alcohol. 2 C3H7OH(l) + 9 O2(g) ==> 6 CO2(g) + 8 H2O (g)

Math
Thanks Dylan! But I wanted to know HOW to WRITE OTHER equations to have the same answers as the ones below? NOT how to solve these! 2x+5y=8 x-3y=-7

Trig
Need answer check pls. Find the rectAngular equation for the plane curve by parametric equAtions. X=t +4 , y= t^2

Math
Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?

Curves defined by parameteric equations
Consider the following. x = e^t - 12 y = e^2t (a) Eliminate the parameter to find a Cartesian equation of the curve.

Trigonometric Functions
Given that 0 < or = x < 2pi, solve each of the following equations in radians. sin2x=square root of 3 over 2

chemistry
Na3PO4(aq) + AlCl3(aq) produces? Complete and balance each of the following equations. If no reaction occurs, write NOREACTION.

chemistry
Zn is less active than Mg. Write the equations describing what occurs when ou mix: a)Zn with 0.5M magnesium chloride, MgCl2 b)Mg with 0.5M ZnCl2

math
find the equations of the quadratics given the following information zeros of 5 and 9 an optimal value of -2 using the formula y=a(x-s)(x-t)

Geometry
What is the length of the midsegment of the trapezoid made by the vertices A(0, 5), B(3, 3), C(5, -2) and D(-1, 2). Show equations and all work that leads to your answer.

Chemistry
for each of the following balanced chemical equations write all possible mole ratios. Mg+ 2HF---> MgF^2+ H^2

Chemistry
how do you and write a combination of reaction equations? Sodium metal reacts with chlorine gas? Na(s) + Cl(subscript)2(g)---______?

physics hw urgent please
show how you would you arrange to find f in terms of v,m and r from four equations below. f=1/t, f=ma,v=2piR/T,a=v^2/R Thanks

math
Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?

math
Solve the following equations algebraically for n. Show your working using factorial notation. a) n!/3!(n-2)! = 12 b) 8Pn = 6720

Linear Equations
Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. -2x - 8y = 22 -6x - y = 20

Math (Grade 9)
Solving Linear Equations: x _ - 3 = 5 7 I know you have to add three to each side, but after that im not sure what to do,, please help!

MATH
solve the system of linear equations using the Gauss- Jordan elimination method x1- x2+ 4x3 = 15 x1+ x2 = X3 = 4 -3X1-X2 + X3 = -2

Linear equations
Please help me solve this problem- Find an equation for the line perpendicular to 6x+2y=-2 having the same y-intercept as -4x-3y=6

Math C30
Last Question disregard .. ooops Solving Equations Containing Circular Functions .. Solve 2cos^2x=1

Math
Hi, I can't seem to figure out the answer to this problem. Thanks to anyone who can help! *Solve the system of equations. Write your solution(s) in the form (x,y). y = x^2 x^2 + y^2 = 20

AP Chem
Complete and balance the following equations and identify oxidizing and reducing agents. S+HNO3---->H2SO3+N2O

Calc 3
Find parametric equations for the tangent line to the curve of intersection of the paraboloid z = x^2 + y^2 and the ellipsoid 6x^2 + 5y^2 + 7z^2 = 39 at the point (−1, 1, 2)

Math
Eliminate the parameter in the pair of parametric equations to find the corresponding rectangular question. x=h+ asecQ y=k+ tanQ

geometry
What are the equations of the lines through (-5, -3) and passing at distance 2sqrt5 from (5,7)? This problem is confusing? How do I solve this? Please I need your Help

Math,Geometry
What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

Math,Geometry
What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

Analytic Geometry
What are the equations of the circles tangent to the x-axis, of radius 4 and whose center is at (-2,y) Please help, how do I solve this problem?

Physical Science Help!
Can someone please help me balance these equations? Thank you for your time!! 1. NO + O2 ¨ NO2 2. NH4Cl + Ca(OH)2 ¨ CaCl2 + NH3 + H2O

Science
Okay, I need help with balancing equations. It's so frustrating for a 7th grader! -_- My problem is: _Na3PO4 + _KOH = NaOH + _K3PO4

equations
solve for x and y x+y=5 and x^x + y^y = 31 i have found x,y = 2,3 or 3,2 but i got the answer by merely substituting the values... is there any proper way to find x and y??

Maths
A and B are real numbers such that the two quadratic equations 19x^2+3x+2=0 and Ax^2+Bx+7=0 have a common root. What is the value of A+B

Math Quadratic Equations
1. Select the approximate values of x that are solutions to f (x) = 0 , where f (x)=8 x^2 +7 x +4 A. ( -0.39 , 1.27 ) B. ( -0.88 , -0.50 ) C. ( -8, 7 ) D. ( -2.00 , 1.75 ) The answer I getting is (B). But I second guessing it could be ( A ). Please let me know !

chemistry
Which metal can be obtained form the ore by heating alone Can you pls write down the word equations for these

PreCAL
Write an equation in slope–intercept form of the line with the given parametric equations. x = 9t + 2 y = –6t + 9 Answer Choices (A) y=-2/3x-3/7 (B) y=-3/2x+3/31 (C) y=31/3x-2/3 (D) y=-2/3x+31/3

Chemistry
Where can I find some chemical equations about land pollution? Please give me the website link.

Math
Change the following to the standard equation of the ellipse 1. 5x^2 + 3y^2 = 15 2. x^2 + 12y^2 = 16 3. 3y^2 + 4x^2 = 3 And please can you give the value of a, b and c of this equations... so that I can sketch it....

Pre-Calculus/Trigonometry
Solve the following system of equations algebraically. Verify your solution by using matrices. 3x-y=0 5x+2y=22

TRIG!
true or false, the two sets of parametric equations x=t, y=t^2+1 and x=3t, y=9t^2+1 have the same graph. justify your decision.

MATH
For the following system of equations, what is the x-value of the solution? -x + 2y = 6 6y = x + 18 A. -18 B. 0 C. -6 D. 3 Confused? Still trying to work it out. Please help! Thanks

trig equations
Find all solutions (if they exist)for the given equation on the interval [0,2pi) cos^2x-5sinx+5=0

pre - CALCULUS
Solve the system of equations using matrices. Use Gaussian elimination with back- substitution. x+y+z = -5 x-y+3z = -1 4x+y+z = -2

pre-calc
Solve the system of equations using matrices. Use Gaussian elimination with back- substitution. x+y+z = -5 x-y+3z = -1 4x+y+z = -2

pre-calc
Solve the system of equations using matrices. Use Gaussian elimination with back- substitution. x+y+z = -5 x-y+3z = -1 4x+y+z = -2

ochm
sodium lauryl sulfate can be prepared by replacing chlorosulfonic acid with another reagent. what could be used? show equations

Help please
Which of the following equations represent a line that has a slope of –5 and that passes through (2, –6)? Check all of the boxes that apply. a.y + 6 = –5(x – 2) b.y – 2 = –5(x + 6) c.y = –5x + 4 d.y = –5x – 28

ALGERBRA 2!!!
Which of the following equations represent a line that has a slope of –5 and that passes through (2, –6)? Check all of the boxes that apply. a.y + 6 = –5(x – 2) b.y – 2 = –5(x + 6) c.y = –5x + 4 d.y = –5x – 28

5th grade math
how do I solve 1 2/3 + 1/6. not coming up with the answers they are giving 5x6 +1x3/3x6 30+3/18 33/18 = 11/6 = 1 5/6 (my equations) their ans. 9/16, 11/6, 16/22, 22/12 and 33/18 help

math
Determine the solution of the following systems of linear equations using elimination. Briefly explain your work. 3x +2y = 19 2x – 3y = -6

Math
Good morning, can someone please give me simple easy steps to solve Quadratic Equations. Thank you

math
solve the following system of equations enter the x coordinate of the solution. Round your answer to the nearest tenth. 5x+2y=22 -2x+6y=3

MATH
What is the p.o.i for these set of equations (the substitution method) 2x+y=6 3x+2y=6 i tried to solve this many times but i keep getting different answers. What does x= and what does y=?

Math
So I'm doing solving system of equations, 2x+y=5 4x+2y=10 I found no solution that would fit it therefore they are parallel to each other. Am I correct?

Chemistry
Complete the following equations: 1. Benzene + hydrogen fluoride ----> 2. Propanoic acid + ethanol ----> 3. 3-pentanol --->(oxidized)

Gaussian Elimination Method
Write the system of equations as an augmented matrix ⎧⎪⎨⎪⎩u=150−7s+4m=25019s−11m=300

precalculus
Can you check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 answer: x=-y^2+4 x=-t y=-t^2+4 x=-t^3 y=-t^3+4

Balancing chemical equations
Chlorine+sulphur dioxide+water giving sulphuric acid+hydrogen chloride

calc
determine the intersection pints of the graphs of the equations y=x^3-4x y=-x-2 I dont understand this please show all work.

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