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September 28, 2016

Search: mathematics: algebra;equations

Number of results: 45,124

mathematical physics
Determine the scale factors for an orthogonal coordinate system (s,t,v) whose coordinates are related to the Cartesian by the following equations: x = 2st, y = s^2-t^2, z = v.
March 22, 2015 by gourav

pre - CALCULUS
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20
April 15, 2015 by Ciara

pre - CALCULUS
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20
April 15, 2015 by Ciara

pre - CALCULUS
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20
April 15, 2015 by Ciara

pre-calc
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20
April 16, 2015 by Ciara

pre-calc
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. x+4y+6z =-32 5x+3y+9z = 20
April 16, 2015 by Ciara

calculus
find volumes of solids generated by revolving the regions bounded by the graphs of the equations about the given lines. y=square root of x y=0 x=3
July 22, 2015 by Pam

CHEM redox equations help!
MnO4 ^- + C2O2 ^2- = MnO2 + CO3 ^2- how would you balance this in basic solution? I keep getting the wrong answer.
October 22, 2015 by lily

Chemistry
I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?
February 24, 2016 by Dan

Chemistry
I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?
February 24, 2016 by Dan

Elementary Mathematics
How can a child who has not yet developed base-ten concepts understands quantities as large as, say, 85? Contrast this with a child who understands these same quantities in terms of base-ten groupings.
March 1, 2008 by Tee

mathematics
a cyclist bikes over a path at 10 miles per hour. he returns over the same path at * miles per hour. what was his average speed for the round trip.((please explain how to do this)
March 22, 2011 by kai

Statistics
A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?
July 5, 2013 by Anonymous

math
A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?
July 5, 2013 by Anonymous

Mathematics
The formula N = 2Xsquared + 22X + 320 represents the number of inmates, N, in thousands, in U.S. state and federal prisons x years after 1980. According to the formula, in what year were there 740 thousand inmates in the U.S. state and federal prisons?
September 22, 2007 by Demetria

math
Mercy must obtain an average mark of at least 85 to get an A grade in her mathematics examination,out of the four examinations she obtained 80,85 and 82 in the first three. Find the mark she must obtain on the fourth examination of to enable her get an A grade.
June 11, 2016 by Glory

Mechanics
What is the formula for time and displacement. Or where on the inet can I find a list of mechanics formulae? I am not allowed to post internet sites but if you go to google and search SUVAT the first option has a list of all the formulas you should need Thank you for using the...
February 4, 2007 by Janine

Chem
This is a lab concerning activity serious of metals and calculation of electrode portentions... Complete the following: if there is NO reaction write NR: (They provided the reactants, my answer is the products) Iron(s) + copper sulfate(aq) → iron sulfate(aq) + copper(s) ...
March 28, 2007 by Marisol

General Chemistry
Change these word equations into formula equations and balance them. Be sure to use the proper symbols to indicate the state of each substance as given. (a) Magnesium metal is placed into hydrobromic acid solution, forming hydrogen gas and aqueous magnesium bromide. (b) When ...
October 3, 2012 by Anonymous

mathematics
A group of twelve people are going to take a ride on a roller coaster at the same time in two different trains, one of which cannot fit more than 8 passengers, and the other cannot fit more than 7. In how many ways can the group take a ride?
May 6, 2016 by -

Mathematics
The angle of elevation of the top of a flagpole from a point on the level ground is 30degrees. From another point on the ground 20m, nearer the pole the angle of elevation is 60degrees. Calculate the height of the pole?
October 8, 2012 by Marydez

College Mathematics
write the statement in symbolic form. Let p: the temperature is 90 degrees Let q: The air conditioner is working r: the apartment is hot. If the apartment is hot and the air conditioning is working, then the tempurature is 90 degrees.
March 6, 2013 by Lisa

mathematics
Determine whether the statement is true, false, or sometimes true. 1) If x and y are both integers, 1) then (-x)3 = -x3 A) Sometimes true B) True C) False
September 4, 2009 by righteous dude

mathematics
the present age of a father and his son are in the ratio 10:3. if the son is 15 years old now, in how many years will the ratio of their age be 2:1?
April 30, 2013 by kola

further mathematics
Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))
September 17, 2013 by James

mathematics
Jake has a cable that is 55.3 feet long. He wants to cut it into pieces that are 7.9 feet long. How many 7.9 foot pieces will he get from the cable?
August 5, 2015 by Jacqueline

Mathematics
The mean mark of Ruth in 8 test is 90.The mean mark of Carol is 85.What is the difference in marks scored by Ruth and Carol?
March 10, 2016 by Akil Ross

algebra
P. 620 #56. Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home size S in thousands...
November 8, 2011 by genie

Survey of Mathematics
Suppose a car rental agency gives the following choices: Option A: $30 per day plus 40 cents per mile Option B: flat $50 per day (unlimited miles) At what mileage are both rates the same if you rent the car for 3 days?
December 4, 2014 by Daisy

MATH Prob.
On a TV game show, the contestant is asked to select a door 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 doors have behind them a $40,000 foreign car...
August 11, 2009 by Twg

MATH 157
On a TV game show, the contestant is asked to select a door 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 doors have behind them a $40,000 foreign car...
April 1, 2010 by Tyga

PRE-ALGEBRA MRS.SUE PLEASE!!!!!!!!!
1. 5h – 9 = –16 + 6h (1 point) 4 –7 7 10 2. 4x + 4 = 9x – 36 (1 point) –8 –7 8 –3 3. Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1) 5. Write an inequality for the word sentence...
December 18, 2014 by I NEED HELP PLEASE!!!!!!!!!!!!

chemistry
a beam of blue light has a wavelength of 595 nm. What is the frequency Since this is not my area of expertise, I searched Google under the key words " wavelength frequency" to get these possible sources: http://zebu.uoregon.edu/~soper/Light/frequency.html http://www....
June 12, 2007 by crystal

PRE-ALGEBRA
1. 5h – 9 = –16 + 6h (1 point) 4 –7 7 10 2. 4x + 4 = 9x – 36 (1 point) –8 –7 8 –3 3. Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1) 5. Write an inequality for the word sentence...
December 18, 2014 by I NEED HELP PLEASE!!!!!!!!!!!!

Mathematics
Prove that log a, log ar, log ar^2 is an a.p. Is the following below correct? Log ar^2 - Log ar= Log ar - Log a hence applying laws of logarithm Log(ar^2/ar) = log(ar/a) Log and log cancels out and then cross-multiply hence a^2r^2 = a^2r^2 L.H.S=R.H.S Hence proved?
July 15, 2009 by Anonymous

math
how do you find the interval Interval between what and what? Since I am not sure what you are asking, I searched Google under the key words "find interval" and "find interval math" to get these possible sources: http://www.yawiktionary.com/i/1148366673828.html http://mathweb....
September 25, 2006 by dustin

College Math
Your small library of books consists of 6 novels, 7 mathematics books, and 1 biology book. Calculate the number of ways to arrange them on a bookshelf for each of these situations. a) The books can be arranged in any order? b The novels must be together but the other books can...
October 18, 2010 by Tian

math
A student of MA101 is preparing a course schedule for the next semester. The student may select one of three mathematics courses, one of three science courses, and one of five courses from social sciences. How many schedules are possible?
April 19, 2011 by Amatusi

Math
Pages are being printed for a brochure. Four out of every 20 are in color. What is the ratio of noncolor pages to color pages? A.20:4 BB.4:16 C.16:4 D.16:20 A? What is the ratio of Ms to all the letters in the word MATHEMATICS? A.2/9 B.2/11 C.11/9 D.11/2 B? What is the ratio ...
November 15, 2012 by Jerald

Mathematics
A lot which is 3 feet times as long as it is wide is enclosed by a walk 10 feet wide. The area of the lot is 1200 square feet more than that of the walk. Find the dimensions of the lot. PLZ help and give a check if possible!
May 5, 2014 by Sadia

mathematics
Oaktree Transportation Corporation has 75,000 shares of stock outstanding. What would the dividend per share of stock be from a dividend declaration of $102,750? How many shares of stock does Jody Nichols hold if her share of the dividend is $20.55?
June 16, 2015 by Anonymous

mathematics
Pick a two-digit number greater than 25. Rewrite your two-digit number as a difference of two numbers. Show how to use the identity (x − y)^2 = x^2 − 2xy + y^2 to square your number without using a calculator.
June 9, 2016 by brandy

Discrete Mathematics
I am having trouble using modus ponens and all the rules of inherence. By any chance do you guys have a link that can explain these concepts in more detail. I've tried multiple books and links...and haven't found a good website that shows this types of proofs in good ...
September 13, 2007 by manny

Survey of Mathematics
In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading. As you answer the questions above, identify what types of misrepresentation or misuse have been demonstrated by referring to ...
September 18, 2011 by Leslie

Mathematics
Find the work done in moving a particle along the quadrant circle that has radius 2, going from A = (2, 0) to B = (0, 2) in the x-y plane through the force field F given by: F = (x - y)i + (x)j No diagram sorry, but the information provided does allow for a full diagram to be ...
April 3, 2013 by Blueberry Tuffin

Algebra II
An air show is scheduled for an airport located on a coordinate system measured in miles. The air traffic controllers have closed the airspace, modeled by a quadratic equation, to non-air show traffic. The boundary of the closed airspace starts at the vertex at (10, 6) and ...
March 23, 2016 by Lashunda

math
out of 100 students in a final examination of class 10, 70 passed in mathematics, 60 passed in science and 10 failed in both subject If 10 students absent find the number of students who passed both subject by using venn diagram
July 2, 2012 by pawan

math
Of the 12 full-time mathematics faculty at a high school, five drink coffee and eight do not enjoy teaching 8 a.m. classes. How many faculty both drink coffee AND enjoy teaching at 8 a.m.
February 16, 2010 by sam

Mathematics
Suppose humans walk 10,000 steps a day on average. If your average step it about 18 inches, how many inches do you walk in a day? How many feet per day? How many miles a day?
January 18, 2011 by Daniel

Math
The traditional method of determining the human age equivalent of a dog is to multiply its age by 7 years. The method we used in this project was to use equations based on scientific data to determine the human age of dogs. In my opinion, the _equations___________method (...
March 9, 2016 by Anonymous

Mathematics
A bullet is found embedded in the wall of a room 2.9 m above the floor. The bullet entered the wall going upward at an angle of 36.7°. How far from the wall was the bullet fired if the gun was held 1.1 m above the floor?
October 18, 2015 by harry

SCIENCE - Pls HELP
A proton (with a mass, mp = 1.673 x 10^-27 kg & electrical charge, e = 1.602 x 10^-19) and an electron (with a mass, me = 9.109 x 10^-31 kg & electric charge -e = -1.602 x 10^-19) are not moving & at a distance of 1.000 x 10^-10 m apart.... (assuming the electrical constant, ...
February 7, 2007 by OLIVIA

Mathematics
For the first 1 1/2 hours of a 91km journey the average speed was 30km/h.If the average speed for the reminder of the journey was 23km/h, calculate the average speed for the entire journey.
July 20, 2009 by Lydia

Mathematics (cumulative frequency
The figures below show to t he nearest minute 80 students waited to be served in a canteen. Waiting time No. of students Cum.Freq 1-5 4 4 6-10 7 11 11-15 11 22 16-20 18 ? 21-25 22 ? 26-30 10 ? 31-35 5 ? 36-40 3 ? How do i find cumulative frequency??? Dont want all the answer ...
June 17, 2009 by Maggie

math 12
In Lisa's first-year college program she must take nine courses including at least two science courses. If there are five science courses, three mathematics courses, four language courses and five business courses from which to choose, how many different academic programs ...
November 27, 2010 by kitkat

Mathematics
Out of 18 times at bat, Jen got a hit 5/6 of the time and Kasa got a hit 8/9 of the time. 1) Who got more hits? 2) How many more?
September 20, 2011 by Gian

mathematics
A house was purchased for $67,000 After 7 years the value of the house was $130,000. Express the house's value V(t) in terms of time t in years.
August 5, 2015 by jacqueline

MATHEMATICS
if 1g of a drug whose half-life is 9 hours is administered intravenously, how much of the drug is left after 3 hours? after 5 hours? after 10 hours?
September 21, 2016 by Matt

Algebra
The average mark on a test in an algebra class is 80. If the two lowest scores of 34 and 48 are not counted, the remaining scores would average 83. How many students are in the algebra class?
October 28, 2010 by Rocky

algebra
The volleyball team at West View High School is comparing T-shirt companies where they can purchase their practice shirts. The two companies, Shirt Box and Just Tees, are represented by this system of equations where x is the number of T-shirts and y is the total cost of the T...
May 23, 2016 by joanne

MATH
A student of MA101 is preparing a course schedule for the next semester. The student may select one of three mathematics courses, one of three science courses, and one of five courses from social sciences. How many schedules are possible? Please can you show me the anwer
May 1, 2011 by sateko

pre-calc
solve each system of equations using matrices x+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I dont see how it is possible to even attempt a matrix on this text oriented site.
October 24, 2006 by Erica

math
solve the following system of equations algebraically or graphically for x and y: y=xsquare-6x+6 y-x=-4 For an algebraicc solution, show your work here. y=x^2-6x+6 y-x= -4 Let's substitute x-4 for y in the first equation. x-4 = x^2-6x+6 x^2 -7x + 10 = 0 (x-5)(x-2) = 0 x = 5 or...
August 12, 2007 by Tashanna

MATH!!
Find equations of both lines through the point (2, -3) that are tengetn to the parabola y=x^2+x i got the derivative as y prime = 2x +1, and i dont know where to go from there. PLEASE HELP this is due tomorrow!!!
October 16, 2007 by Justin

Calculus
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y=ln x, y=0, x=1, x=3 Please show the steps in your work, thanks! :)
March 27, 2008 by Sun

Calculus
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y=ln x, y=0, x=1, x=3 Please show the steps in your work, thanks! :)
March 29, 2008 by Pan

Phy
98N-T=10a T-18.89N=3a I worked on the problem and I end up getting two equations but now I have to find T and a. For some reason, I cant solve it. Thanks
February 28, 2010 by Ana

Math
solve the system of linear equations using the addition method. Can you please show me the steps on how you reached the answer. Thank You 2x+20y= -144 12x+5y= 56
May 11, 2010 by Heather

math
Find equations for exponential functions that pass through the given pair of points. (Round all coefficients to 4 decimal places if necessary.) (-2, 3) and (3, 4)
October 7, 2010 by liz

Maths- Discriminants
Find the values of k for which the following equations have 2 distinct roots. a)kx^2+kx+2=0 b)kx^2+3k+k=0 c)x^2-2kx+4=0 Im stumped please show working so i can see what needs to be done
October 31, 2010 by Anonymous

Chemistry
I am having some difficulties balancing the following equations: Cr2O3(s)+CO(g)->Cr(s)+CO2 Ca(OH)2(aq)+Na3PO4(aq)->Ca3(PO4)2(s)+NaOH(aq) Sb2S3(s)+O2(g)->Sb2O3(s)+SO2(g)
November 13, 2010 by TMV

MATH
Determine graphically whether each given point is a solution to the system of linear equations. y = 4x-9 y = -2x+3 (2, -1) Is there any good online graph which could help me plot the points and stuff?
January 5, 2011 by Anonymous

chemistry
Complete the following word equation and write the balanced formula equations: a. Zinc(s) + iodine(g) b. Hydrogen peroxide(l) c. Magnesium(s) + lead(IV) nitrate(aq)
March 3, 2012 by Anonymous

chemistry
3. Complete the following word equation and write the balanced formula equations: a. Zinc(s) + iodine(g) b. Hydrogen peroxide(l) c. Magnesium(s) + lead(IV) nitrate(aq)
March 4, 2012 by Anonymous

Chemistry
A compound has four pKa values (3.5, 5.8, 9, and 12). Calculate the pH of the solution when 500 ml of 0.50 M of tetrasodium X is mixed with 650 ml of 1.0 M HCl. Include chemical equations in the answer.
September 5, 2012 by dhruti

Physics
A stone is thrown from the ground with initial velocity v0 directed at angle alpha with respect to the horizon. Find equations of its motion both in x and y directions.
November 10, 2012 by David

analytic geometry helps are appreciated
For some positive real number r , the line x+y=r is tangent to the circle x^2+y^2 = r. Find r. How do we do this? Set equal equations together??
March 1, 2013 by Knights

Derivative
given that f, g, and h are differentiable functions f(g(h(x))) = x what is h'(x) in terms of f, g, f', g', and h'? I plugged in equations on my own like h(x)= x^4 g(x) = 4th root of x f(x)= x^2 i need more assistance on how to proceed thnx
March 7, 2013 by Mary

math
I am working on quadratic equations and I have worked a problem down to 3 plus or minus the square root of 361 all over 2... what next?
March 12, 2013 by Robin

math
The real numbers x and y satisfy the nonlinear system of equations {2x^2 − 6xy + 2y^2+ 43x + 43y = 174 x^2 + y^2 + 5x + 5y = 30. Find the largest possible value of |xy|.
June 17, 2013 by jack

math
The real numbers x and y satisfy the nonlinear system of equations 2x^2−6xy+2y^2+43x+43y=174 & x^2+y^2+5x+5y=30. Find the largest possible value of |xy|.
June 20, 2013 by raja harishchandra

math
The real numbers x and y satisfy the nonlinear system of equations 2x^2−6xy+2y^2+43x+43y=174 x^2+y^2+5x+5y=30. Find the largest possible value of |xy|.
June 21, 2013 by anonymous

Pre-Cal
How do you find the number of solutions(not all the answers) for each of the following equations 1) 2sec^2 4x - 3sec4x =5 2) 2tan^2 12x +3tan12x -7 =0 3) 2sin^2 5x + 3sin5x +1 =0
November 18, 2013 by Lilly

Calculus 2
Find Mx, My, and (x, y) for the laminas of uniform density ρ bounded by the graphs of the equations. y=sqrt(x)+4 y=(1/2)x+4 The I keep getting 20/3 for Mx but webassign acts like it is wrong.
February 5, 2014 by Dominic

Math (Calculus)
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the y-axis. (Use Disc Method) y=3(2-x), y=0, x=0
May 8, 2014 by Sherman

Math
Which of these equations would not be in quadratic form? A.X^4-13X^2+36=0 B.2X^(2/5)+X^(1/5)-6=0 C.6x^3+2x^2-8X=0 D.3(2/x-4)^2+5(2/x-4)-2=0 I think its between C or D. C because the exponents are different not doubled and D because its set up is completely the opposite from ...
September 3, 2014 by M

Chemisty
The aqueous solution of two soluble salts are mixed to precipitate an insoluble salt. Give four different equations to support this statement.
May 3, 2015 by Saurav ; please help

English 1
What did the author of “The Cold Equations” most likely want you to believe? What examples from the story make you think this? Explain your answer in three to five sentences.
June 17, 2015 by Anonymous

Logarithm help please
Express y as a function of x. What is the domain? Explain your answer. log4y = x + log4 Solving exponential equations with logarithms Solve to the nearest thousandth. 5^1+x = 2^1-x
September 18, 2015 by Joe

Chemistry
Construct a Born Haber cycle for the formation of calcium oxide showing clearly using equations, the steps of the enthalpy stages involved
January 28, 2016 by Demario

Pre-Calculus
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x - y + 3z = 12 x + 4y + 6z = -32 5x + 3y + 9z = 20 Please help me..
June 2, 2016 by Liz

Math
When Albert flips open his mathematics textbook, he notices that the product of the page numbers of the two facing pages is 156. Which equation could be used to find the page numbers that Albert is looking at? a. x+(x+1)=156 b.(x+1)+(x-2)=156 c.(x+1)(x+3)=156 d.x(x+1)=156
March 28, 2009 by Angie

Mathematics C 8th grade
Two cars traveled equal distances in different amounts of time. Car A traveled the distance in 2.4 h, and Car B traveled the distance in 4 h. Car A traveled 22 mph faster than Car B. How fast did Car A travel? _______MPH
October 3, 2014 by Destiny

Mathematics
a cuboid with length 13cm width 4cm and height h State in terms of h the shaded face of the cuboid. write an expression in terms of h for the volume of the cuboid. if the volume of the cuboid is 286cm cube calculate the height h of the cuboid.
May 2, 2012 by SAM

Mathematics
A Pendulum 45cm long swings through a vertical angle of 30degrees. Find the distance of the altitude through which the pendulum bob rises. (I couldn't find this answer either :\ but can anyone please please help me! And if you can, can you also write the equation on how you ...
March 5, 2008 by Nazharia

mathematics
Please help me answer this question; 1.A metal gutter open at the tops and ends, is bent up from material 30 cm wide to form a rectangular cross section. a) If the base of the gutter is x cm wide, find the height of the gutter. b)Show that the area of the gutter cross section ...
August 29, 2011 by Ruby

Health and science
Explains the science, technology, engineering and/or mathematics behind a solar cooker that work day and night and how could a solar cooker that works day ajd night both address the everyday problems and have a broader impact locally or globally.
January 19, 2016 by Anonymous

mathematics
a ship which started at port p, sailed 15 km due south to port q , and then a further 20 km due west to port r. calculate pr , the shortest distance of the ship from the port where the journey started .
March 1, 2014 by patrice

algebra
Solve the inequality. |2x+3|< 26 So there are two answers to this problem? Do you switch the inequality sign for the second answer? This is the absolute value of some quantity I suppose. We have |2x+3|< 26 Thus we want numbers such that -26 < 2x+3 < 26 You can ...
August 30, 2006 by anonymous

Algebra1!Plz help I have test 2morrow!!!
so would the new eqaution be... 2x+8=10 then.. 2x=2 x=1? We know that y = x + 8. So if x + y = 10, then x + x + 8 = 10. but what about the y?ANd what do I do afetr that? If you know what x equals, then you can calculate what y equals. Once you've solved for x and y, you are ...
November 4, 2006 by Sammy

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