# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 24
1. ## Algebra

define the following new variables X to A =W X to B =X Y to A =Y Y to B =Z w+x=32 y+z=8 w+y=22 x+z=18 You helped me solve for y Ijust added w+y=32 220w+300(32-w)+400(22-w)+180(8-y)=9280 , w+y=22 The answer I got was y=32 I solved for x and got x=42 I don't

asked by mike on December 25, 2009
2. ## Chemistry

Please show work. 2Al(s) + 2NaOH(aq) + 6H2O(l) ---> 2NaAl(OH)4(aq) + 3H2(g) What mass of hydrogen gas would be formed from a reaction of 2.48 g Al and 4.76 g NaOH in water? Pb(NO3)2(s) + 2NaI(aq) ----> 2PbI2(s) +2NaNo3(aq) (a) If the solution contains 7.00

asked by Anonymous on February 25, 2013
3. ## Algebra ll

Consider the system below. {4x-2y=-12} {3x-y=-3} Solve the system by using a matrix equation.

asked by Me and I on June 13, 2014
4. ## Math

what is the solution of the system? 4x-y= -3 6x-y= -8 (5,5.5) (-2.5, -7) (-2.5, 2.2) (20, -28) what is the solution of the system 5x+6y=20 9x+11y=32 (28, -20) (28, 20) (-28, 20) (20, -28)

asked by rainbow on December 16, 2018
5. ## Physics

1. A weight lifter lifts a set of weights a vertical distance of 3.85 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights? (Show all work and include units of measure) 2. A car has a kinetic energy of

asked by Amber on October 24, 2018
6. ## maths B

i don't understand how to do simultaneous solutions of linear functions. i don't understand what elimination is and how to substitute. for eg. 4c-3d=11 3c-4d=17 is that elimination? how is it done?

asked by tegzy on March 14, 2009
7. ## precalculus

solve logarithmic equation in exact form only. show work. log_5(x-3)+ log_5(x-6)-log_5(x+1)=2

asked by Sara on January 15, 2012
8. ## physics

A heavy table of mass M is vibrationally isolated by being hung from the ceiling by springs, so that its frequency of vertical oscillation is \omega_0 (take \omega_0 to be 2\pi/sec, a typical value). Assume now that the ceiling vibrates vertically with

asked by david on January 8, 2015
9. ## Maths

3(3-4d)=57 could you pleas show method thanks

asked by Arran on January 28, 2011
10. ## math

find x 4x-5/1-5x = x+1/x+7 please can you show me the method thanks

asked by peter on October 27, 2010
11. ## Maths

(1+a+b+c)(1+ 1/a +1/b +1/c )= 16 then find a+b+c. Show the method

asked by Sanjay on March 23, 2017
12. ## Physics

Starting from rest, a 5kg block slides 2.5 m down a rough 30o incline in 2 seconds. Find a) the work done by the force of gravity. b) the work done by friction. c) the work done by the normal force Help ASAP please!! Show work step by step only with the

asked by Anonymous on October 20, 2016
13. ## Pre-Algebra

Directions: The traditional method for calculating a dog's age in dog years is to multiply its age in human years by 7. The chart below describes a different method some veterinarians use to estimate a dog's age based on its size. Size: Small Medium Large

asked by killjoy on January 15, 2019
14. ## Math

Consider the arithmetic series 7 + 19 + 31 + 43 + 55 + pr004-1.jpg. a) How many terms are less than 1000? (3 marks - show your work) b) How many terms are less than 2000? (3 marks - show your work)

asked by Alex on September 16, 2014
15. ## Math

1. Using the following system of equations : 4x +2x = 6 2x + y= 3 A: Find the solution(s) algebraically showing all work (4 pts) B: State whether it is independent consistent, dependent consistent, or inconsistent. (2pts) C: Demonstrate how to check the

16. ## Chemistry

Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the

asked by Danielle on April 30, 2007
17. ## Biology

*Yawn* Match the terms with the correct description: a. regulates supply of gases from ATP production b. provides negative feedback signals c. protects body against foreign dangers d. "rapid transit" for liquids and gases e. primary "regulator" of sensory

asked by mysterychicken on March 21, 2010
18. ## math

how would you solve for y in this problem: x=(y^2+3y)^(1/3) I got: y= x^3/y - 3 ? and for this problem: x= 1/[(y^2+3y-5)^3] I got: y = y/x + 5/y - 3? However, I do not know how to solve for y explicitly. I don't think quadratic formula would work in these

asked by kristie on July 20, 2006
19. ## Chem

The following questions refer to the following system: A total of 30.0 mL of a .10M solution of a monophonic acid (Ka = 1.0 x 10 ^-5) is titrated with .20M sodium hydroxide solution. 1) Before the titration begins, the pH of the solution is about A) 2 B) 5

asked by Charlie on April 6, 2014
20. ## Math

Are you trying to solve for x, n or p? solve for n Show me how to work this problem. 2n = 4xp - 6 what is the problem? what grade r u in i am in 6 grade To get n all by itself, you need to divide by 2. But if you divide by 2 on the left, you have to divide

asked by drwls on March 14, 2007
21. ## algebra

Can someone show me the complete solution to this word problem? William,a logistician,needs to route a freight train that is 20 feet at its tallest point and 10 feet at its widest point within 3 days. the most direct path includes a single-track tunnel

asked by Jack on January 10, 2017
22. ## Chemistry.

Please explain how to solve this question, and why you use your method to solve it. I am very very stuck. Gold is present in seawater to the exteen of 0.15mg/ton. Assume the density of the seaswater is 1.03g/mL and determine how many Au atoms could

asked by Philip on September 21, 2006
23. ## Algebra

An Algebra I test contains 30 questions. Some of the questions are worth 4 points each, and some are worth 2 points each. The total test is worth 100 points. Let f represent the number of questions worth 4 points and t, the number of questions worth 2

asked by lol on June 10, 2013
24. ## Chemistry

I know nothing about chemistry, but am wondering if someone could help me with these. 1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic

asked by Sara on October 14, 2010
25. ## Algebra

I'm really lose with this problem...HELP Using Cramer Rule If D=O use another method to solve 2x/3-5y/2=3/2 -x/4+5y/2=7/2 I don't know where to begin on how to solve this problem.

asked by Gwendolyn on September 16, 2011
26. ## Chemistry

Hi Dr Bob, I understand the 2nd method but need to clarify the 1st method.If I only wish to draw 1 Al and 1 O, then I need to include the "plus" sign and draw the 'dot and cross' diagram as 2[Al]+ 3[O] , with the charges of course, right? Posted by candy

asked by candy on April 2, 2009

1. Which of the following statements explains why threats are NOT effective for motivating people? A. Threats reduce tension. B. Threats ensure that appropriate actions are not abandoned. C. Threats produce permanent change. D. Threats provoke

asked by Ron on July 29, 2012
28. ## Trigonometry

Without using the Calculator, solve the ff: (show solution) a. Cos 18° b. Tan 18° c. Cot 18° d. Sin 9° e. Cos 9° [Hint: Using any of the formulas for Half- Angle, Double Angles, Reduction] Good Day!!! Thank you for the time. :)

asked by Fern Angel on April 29, 2016
29. ## Chemistry

Can some one show me a simple step by step solution to solve this. The book is very confusing. Determine the amount of NH4Cl that will be formed from the 34.0 g of NH3. Remember to use significant figures and a unit in your answer (for example, 275 g).

asked by Daniel Macombson on May 17, 2014
30. ## Math

Solve for S: r^2s-5s=7. Solve for b: L= 4a^2b. I'm confused about how to solve these problems. Could someone show me the steps?

asked by Sue on September 12, 2011
31. ## Geometry

1) Explain how you can use a straightedge and a compass to construct an angle that is both congruent and adjacent to a given angle. 2) When constructing a perpendicular bisector, why must the compass opening be greater than the 1/2 the length of the

asked by 123 on September 27, 2016
32. ## Geometry

1 Explain how you can use a straightedge and a compass to construct an angle that is both congruent and adjacent to a given angle. 2 When constructing a perpendicular bisector, why must the compass opening be greater than the 1/2 the length of the segment?

asked by Scarlet Snape on September 21, 2018
33. ## Math

1 Explain how you can use a straightedge and a compass to construct an angle that is both congruent and adjacent to a given angle. 2 When constructing a perpendicular bisector, why must the compass opening be greater than the 1/2 the length of the segment?

asked by Sunshine on September 21, 2018
34. ## algebra 1

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after

asked by Brittany on May 1, 2013
35. ## Math

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after

asked by Brittany on May 1, 2013
36. ## college algebra

for the given function f&g, find the following and state the domain of each result f(x)=2x+1/9x-5; g(x)4x/9x-5 a.(f+g)(x)= what is the domain? b.(f/g)(x)= what is the domain? please show work answer the following for the given quadratic function

asked by spazed out on December 1, 2012
37. ## math

A sound wave is modeled with the equation y= 1/4 cos2pi/3 theta. a. Find the period. Explain your method. b. Find the amplitude. Explain your method. i think the period is 2pi/3 but i feel like im wrong so could someone solve this and explain it for me?

asked by stan loona on June 3, 2019
38. ## Math

Steven goes to a game store. He purchases a new game system for $120. He purchased the game console for$82 and 2 used video games that were equally priced. How much did each of the video game cost? Show all of your work. Please help me with this question.

asked by Jassy on January 2, 2018
39. ## algebra

Part A: Graph the system of linear equations. Part B: Use the graph created in Part A to determine the solution to the system. Part C: Algebraically verify the solution from a Part B x + 6y = 6 y = 1/3x - 2

asked by Anonymous on January 26, 2018
40. ## Physics

Two particles A and B has the same mass and are being kept on a rough horizontal table "d" distance apart.B is kept still and A is given a velocity of u towards B.After the collision,if A comes to its previous point show that, u^2 = 2agd[1+(1/e^2)] a-

asked by Aanya on August 2, 2017
41. ## ALGEBRA

Find the choice below which gives a first step in solving the given system of equations by the addition method 6x - 5y = 12 x + y = 3

asked by TERESA on February 23, 2012
42. ## Chemistry

1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn(OH)2 + MnO2

asked by Sara on October 13, 2010
43. ## Chemistry

What is the molarity of OH- in a 7.83×10-3 M NaClO solution that hydrolyzes according to the equation. ClO-(aq) + H2O(l) = OH-(aq) + HClO(aq) The information they give is that constants Kh=2.86E-7 I know how to solve the problem when the constant Kw is

asked by Jay on December 5, 2011
44. ## Math

asked by Memes on October 12, 2017
45. ## Algebra

A boat traveled 180 miles downstream and back. The trip downstream took 10 hours. The trip back took 30 hours. Find the speed of the boat in still water and the speed of the current. Solve each system using any method

asked by Kevin on February 26, 2017
46. ## Science

Consider the isothermal expansion of 4.50 mol of an ideal gas at 450 K from an initial pressure of 12.0 bar to a final pressure of 2.75 bar. Describe the process that will result in the greatest amount of work being done by the system and calculate work

asked by Katherine on January 25, 2011
47. ## Algebra 1

23.what is the slope of a line parallel to a line represented by the equation x=2y-3? 19.what is the solution to the following system of equation? Y=4x-8 Y=2x 16.which graph below shows the function f(x)=-3x-1? 12.what is the solution to the following

asked by Elyon on January 21, 2012
48. ## Math (Calc) (Differential Equation Solution)

Some of the curves corresponding to different values of C in the general solution of the differential equation are shown in the graph. Find the particular solution that passes through the point (0, 2). y(x^2+y) = C 2xy + (x^2+2y)y' = 0 How would I start

asked by Ray on May 30, 2017
49. ## precalculus

Find all solutions of the system of equations. (If there is no solution, enter NO SOLUTION.) 4x^2− 27y^3 = 35 8x^2+54y^3= 74

asked by amaa on December 1, 2012
50. ## algerbra

Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 12y = -12x - 12 no solution (0, -1) (-1, 0) infinitely many solutions

asked by robert on September 8, 2014
51. ## Engineering

For what values of (¢ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-¢)x+4y+2z=4 4x+(5-¢)y+2z=4 2x+2y+(2-¢)z=2

asked by Edward on August 2, 2015
52. ## Physics

4. If F1 stands for a force vector of magnitude 30.0 N and F2 stands for a force vector of magnitude 40.0 N acting in the directions shown in Figure 3-6, what are the magnitude and direction of the resultant obtained by the vector addition of these two

asked by Winsome Purrier on June 14, 2016
53. ## MATH HELP

The south edmonton pet shop has several parrots and dogs for sale. There are a total of 24 heads and 82 legs in the display cages. A) Write a system of linear equations to represent the number of parrots, p, and the number of dogs, d, for sale. p+d = 24

asked by Anonymous on January 10, 2011

Use the compound interest formulas A = Pert and A = P(1 + 𝑟/n)^nt to solve. Suppose that you have $11,000 to invest. Which investment yields the greater return over 10 years: 6.25% compounded continuously or 6.3% compounded semiannually? Show your work. asked by Ciara on April 10, 2015 55. ## physics 27. A communications satellite transmits a radio wave at a frequency of 5 • 109 Hz. What is the signal’s wavelength? Assume the wave travels in a vacuum. Show your work. (3 points) I at least need the formula and how to solve it... not the answer. asked by Ms. Simpsonizer on April 19, 2012 56. ## chem an aq. solution(NaCl) made by using 133g diluted to a total solution volume of 1 L.Calculate the molarity, molality & mass % of the solution(density of solution = 1.08g/mL) [ans: M=1.92M, m=2.0m, 10.4 %] i need the calculation work bcus my ans is asked by lily on July 21, 2011 57. ## math-linear equations Its a story problem: The flying W Ranch raises only cows and horses. There are total 340 animals. The owner prefers horses to cows, so he has 52 more horses than cows. a. Write two different linear equations to model this situation. b. Solve the system of asked by B on January 19, 2016 58. ## math Identify the solution(s) of the system of equations, if any. -2x-4y=1 12y=-6x-3 a) no solution b) (0,-1) c) (-1,0) d) infinitely many solutions asked by monet on January 27, 2013 59. ## Math 116 Identify the solution(s) of the system of equations, if any. -6x-2y=12 4y=-12x-24 a. no solution b. (0,-2) c.(-2,0) d.infinitely many solutions asked by Queta on June 21, 2013 60. ## algebra Graph the system of inequalities (shade each half-plane solution,not only the overall solution). y asked by Anneliese on December 26, 2016 61. ## math 6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions asked by KiKi on March 27, 2010 62. ## finite math Determine whether each system of linear equations has a)one and only one solution, b)infinitely many solutions, or c) no solution 2x-4y=5 3x +2y=6 asked by bob on April 3, 2012 63. ## algebra 1)What is the 4x^2=y^2+8y+32 answer= either hyperbola or parabola 2)The graph of which equation is a circle? answer= 5x^2+10x+5y=9 3)Solve the system of equations by graphing x^2+y^2=16 and y= -x+4 answer= (4,0),(0,-4) 4)Find the exact solutions of each asked by Marissa on August 20, 2007 64. ## math 6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions These points would have C correct? asked by KiKi on March 28, 2010 65. ## Math Solve by elimination: 5x+7y=77 , 5x+3y=53 can you please help me out step by step so I can understand it on my own, thanks. asked by Alex on May 1, 2014 66. ## Math Help! I need to get these questions done before 8:30. Write a system of equations to model each situation. Solve my any method. 4.You and some friends buy hamburgers and milkshakes for lunch. A hamburger costs$1.50 and a milkshake costs \$2.00. The total

asked by Mal on May 31, 2018
67. ## circles

a. To find X, you will need to add the arc measures together and set this expression equal to the total degrees of a circle and then solve for X. Must show all work. b. Here are the steps to take (show all work) 1. Plug your x-value from a into each of the

asked by lilman on May 23, 2012
68. ## math

Here's my question: Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If

asked by Alex on January 26, 2015
69. ## Maths

x/2 + x/4 = 1 the answer is 1 1/3 can you show me the method please thanks in advance :)

asked by Greg on October 30, 2009
70. ## math

find x x^2-3x-4 = x^2 +11x+24 please can you show me you method thanks

asked by peter on October 27, 2010
71. ## algebra

how would i find an equation of a line that goes through points(1,6) and (3,10)?? thanks A straight line is y=mx+b Substitute the points to make two equations. 6=m(1)+b 10=m(3)+b Two equations; two unknowns, m and b. Solve for m and b, then plug back into

asked by jasmine on December 22, 2006
72. ## math

given the equation -3x +2y =4, Write another equation that will form a linear system with: one solution, no solution and infinite solution. infinite solution: (-3x +2y =) * 3 -> -9x +6y =12 y=3/2x+4 -9x +6y =12 I think we have to multiple the first

asked by Jay on April 16, 2015
73. ## physics

A system does 196 J of work on its environment and gains 40 J of heat in the process. (a) What is the change in the internal energy of the system? J (b) What is the change in the internal energy of the environment? J I thought the answer would be +40 for

asked by Will on April 26, 2008
74. ## MIS (java)

Download A04.txt and copy it into a new Eclipse project named {NetID}A04. Rename (refector) {NETID}A03.java to {NETID}A04.java Modify the return type of magicEightBallIf and magicEightBallCase so they return a String instead of printing the result. Create

75. ## algebra

Let f(x)= 2x^2 +7 and g(x)= x – 6. (a) Find the composite function (f*g)(x) and simplify. Show work. (b) Find ( f*g)(1). Show work.

asked by david on May 9, 2014
76. ## Calculus

Let f (x) = 5x^2 – 9 and g(x) = x – 3. (a) Find the composite function ( f o g)(x) and simplify. Show work. (b) Find ( f o g)(2) . Show work.

asked by Brian on March 10, 2012
77. ## Chemistry

You isolate an acidic compound in an experiment by first separating it from the organic layer. Then you have a solution containing a salt of an acid. You acidify it using concentrated HCl. A precipitation begins to form while the solution is still basic..

asked by Rachel on October 23, 2011
78. ## College Chemistry

Calculate pH of a 1.0 mol L -1 boric acid solution. (Ka(H3BO3) = 5.8 x 10 power -10 Please solve this problem. My computer does not have the power symbol. Can you please show maths and steps. Is mollar mass required of the above. Is -log and constant above

asked by Elleni on October 22, 2010
79. ## chemistry

HB, pH=1 To neutralize 10cm3 it took 5.00cm3 NaOH 10cm3 of the solution HB are diluted with water to make 1 litre of solution. The pH of the new solution is 3. Show that HB is the strongest acid.

asked by Anonymous on November 24, 2009
80. ## Chemistry!

HB, pH=1 To neutralize 10cm3 it took 5.00cm3 NaOH 10cm3 of the solution HB are diluted with water to make 1 litre of solution. The pH of the new solution is 3. Show that HB is the strongest acid.

asked by Anonymous on November 24, 2009
81. ## Chemistry

If one were to mix 200.0 mL of an HCl solution that had a pH of 3.00 with 200.0 mL of an NaOH solution that had a pH of 10.00, what would be the pH of the final solution? Can you show me the steps please so that I can apply to questions that ask for the

asked by Anonymous on December 16, 2010
82. ## Calc easy

Having trouble getting the correct solution. The integral of “x squared” in the numerator and “x squared plus x minus 6” in the denominator. S X2 / (X2 + x – 6) dx Thanks! That's a messy one. According to my table of integrals. The answer is -x/6

asked by Ang on February 23, 2007
83. ## Science

Which of the following body systems does not rely on the autonomic nervous system to simulate involuntary events? A. skeletal system B. digestive system C. circulatory system D. respiratory system A

asked by Anonymous on February 20, 2014
84. ## science

which of the following body systems does NOT rely on the autonomic nervous system to stimulate involuntary events? A. Skeletal System B. Digestive System C. Circulatory System D. Respiratory System

asked by hi on February 25, 2014
85. ## Science

Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens. A. Integumentary system B. Nervous system C. circulatory system D. endocrine system I think it is C

asked by Jack on November 16, 2017
86. ## Science

Which of the following body systems does not rely on the autonomic nervous system to simulate involuntary events? A. skeletal system B. digestive system C. circulatory system D. respiratory system A

asked by Anonymous on February 20, 2014
87. ## Physics I

Using 6400 km as the radius on Earth, calculate how high above Earth's surface you would have to be in order to weigh 1/16th of your current weight. Show all work leading to your answer OR describe your solution using 3-4 complete sentences.

asked by Sarah on October 28, 2014
88. ## Pharmaceutical Dosage Forms

If there is 1 g KH2PO4 and 1 g K2HPO4 in 100mL of solution, what is the mEq/mL of potassium? The Answer is 0.19mEq/mL. But I need to show work on how to get the answer. Textbook Applied physical pharmacy By Mansoor M. Amiji, Beverly J. Sandmann Chapter 3

asked by Jay on November 30, 2010
89. ## Algebra

What is the solution to the system of equations that contains –3x + y = 3 and 2x – y = –1? A. no solution B. (–1, 3) C. infinite number of solutions D. (–2, –3)

asked by Emma on June 16, 2014
90. ## math

Identify the solution(s) of the system of equations, if any. -3x -4y = 2 8y = -6x – 4 a) infinitely many solutions b) (-16/9, 5/6) c) (-2/3, 0) d) no solution

asked by monet on January 27, 2013
91. ## math

Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 4y = -4x - 4 A) no solution B) (0, -1) C) (-1, 0) D) infinitely many solutions

asked by sam on October 20, 2013
92. ## Math 6

Identify the solution(s) of the system of equations, if any. -3x-4y=2 8y=-6x-4 A) infinitely many solutions B) (-16/9, 5/6) C) (-2/3, 0) D) no solution

asked by sam on October 20, 2013
93. ## Math 116

identify the solution (s) of the system of equations, if any. -3x-4y=2 8y=-6x-4 a. infinitely many solutions b. (-16/9, 5/6) c.(-2/3,0) d. no solution

asked by Queta on June 21, 2013
94. ## linear systems

for what values of k does the linear system below have: a) infinite solutions? b) one solution? c) no solution? 2/3x+y=16 kx+3y=48

asked by Anonymous on May 30, 2015

You are working with the following equilibrium system in which one chromium complex is blue and one chromium complex is purple. The system is at equilibrium and is currently blue. Predict how the color will change if aqueous Ag+ ions are added. Ag+ reacts

asked by HK on November 15, 2010
96. ## Chemistry

A solution is prepared by adding of KOH to 1 liter of water. The resulting solution has an [OH negative]of 1 * 10 negative 3. What would be the pOH of this solution? Can you show me how you came up with this answer? Thank you.

asked by Tia on April 27, 2011
97. ## chemestry

To 400mL of a 0.1 M CH3COOH solution(Ka=1.8 x 10-5),two subsequent additions of 100mL of 0.2 M NaOH solution have been done.determine the solution pH after each addition. Drbob,I don't understand this problem how to solve.Can you help me and give me the

asked by Anonymous on June 26, 2016
98. ## intermediate algebra

in solving the equation (x+4)(x-4)=9 eric stated the solution would be x+4=9 =>5 or x-4=9 =>13 however at least one of these solutions fails to work when subsituted back into the original equation. why is that? solve the problem yourself and explain your

asked by Anonymous on August 22, 2012
99. ## Physics

Jack rides his 213kg motor cross bike 25.3m up a 30.0 degree slope at a constant speed. what is the energy his bike expends if the frictional force opposing its movement is one-tenth its weight? Are you sure the mass is 213 kg? Shouldn't it be 21.3 kg? Or

asked by Jarin on August 3, 2007
100. ## health

The cardiovascular system is also known as the ________. A. Blood pathway system B. Heart gateway system C. Circulatory system D. Vascular crossings system A?

asked by Martin1162 on March 11, 2016