1. ***chemistry

    Why is vinegar recommended for cleaning coffee pots, steam irons, and kitchen and bathroom faucets with white deposits on them? Why does it work, and what is the chemical equation for how it works?

    asked by samantha on November 3, 2010
  2. Physics Quick

    Quick question because i am trying to complete a lab report. How can i find the linear tangential acceleration of a wheel as it is turned by two hanging masses by using Newton's Second Law and the equation ΣT=Iα?

    asked by Dib on December 2, 2014
  3. advance functions gr 12

    2 QUICK QUESTIONS PLEASE HELP ME I NEED THEM FOR THE MORNING! the ______________ (fill in blank) of logarithms state that log (xy)= logx + logy solve the equation 6^3x+1= 2^2x-3, Leave in extact form THANKS

    asked by samantha on June 10, 2013
  4. physics

    What magnetic field is required to constrain an electron with a kinetic energy of 400eV to a circular path of radius .80m? (answer: 8.4x10^-5T) What equation(s) do I use? Any help is appreciated!

    asked by Anonymous on March 15, 2008
  5. Chemistry

    Help!!!!!!!!!!!! Fe + CuSO4 --> Cu + FeSO4 2.05g 7.00g 2.46g 151.8g Which reactant was limiting and how does this chemical equation support this? The numbers beneath the names are the masses in grams.

    asked by Megan on February 18, 2013
  6. AP Chemistry

    An aqueous sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution at 20°C has a density of 1.3294 g/mL. Calculate (a) the molarity, (b) the molality, (c) the percent by mass, and (d) the mole fraction of H2SO4 for the solution. (MM H2SO4

    asked by Beth on January 5, 2010
  7. Chemistry

    If a solution has a total mass of 26.7g and is 8.36 % by weight in sodium chloride, what mass of sodium chloride is present in the solution? How many moles of dextrose (C6H12O6) are in 414mL of solution with a concentration of 0.84M? If an aqueous solution

    asked by larlee on September 26, 2017
  8. science

    4 gm of N aOH are present in 0.1dm3 solution have specific gravity 1.038 gm/ml. calculate: a. Molality of N aOH solution; b. Molarity of N aOH solution.

    asked by rohan on May 3, 2016
  9. chemistry

    What is the molarity of the following solutions? (a) 2.1 mol KCl in 1.7 L of solution 1 M (b) 1.04 mol H2SO4 in 335 mL of solution 2 M (c) 0.944 mol of ammonia in 215 mL of solution 3 M

    asked by Bobby on February 24, 2011
  10. Chemistry

    An aqueous solution of a monoprotic acid is prepared. This acid is known to have a pKa of 8.6. If the acid is 37.5% ionized when in solution, what is the pH of the solution? Not really sure where to start with this question? Thanks in advance

    asked by Jessica on April 14, 2015
  11. math

    buying a house supposed you are in the market for a new home and are intersted in a new housong community under construction in different city. the sales representative informs you that there are two floor plans available, and that there are a total of 56

    asked by ann on October 19, 2009
  12. math

    buying a house supposed you are in the market for a new home and are intersted in a new housong community under construction in different city. the sales representative informs you that there are two floor plans available, and that there are a total of 56

    asked by ann on October 19, 2009
  13. Chemistry - Equilibrium

    You have an unknown concentration of ammonia. When you add 15.0mL of a 0.400 M HCl solution to 50.0mL of the ammonia solution, the pH of the solution becomes 8.75. What is the concentration of the original ammonia solution? [Kb (NH3) = 1.8 x 10^-5]

    asked by Martha on April 25, 2012
  14. Math 209

    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

    asked by Lulu on March 17, 2012
  15. 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

    asked by genie on November 8, 2011
  16. Math Algebra 1

    For most people, buying a house is a great investment that can offer security in an uncertain world, but buying a house is also a commitment. Application Practice Answer the following questions. Use Equation Editor to write mathematical expressions and

    asked by Antonio on August 15, 2008
  17. physics

    9)Which has more momentum? A .1 kg toy truck moving at 1012 m/s or a real 2200 kg truck moving at .046 m/s? The real truck since it has more mass 10)A 120 kg football player tries to dive into the endzone at 7.5 m/s to score a touchdown. A 150 kg player

    asked by Jon on April 1, 2008
  18. Math

    Which of the following ordered pairs is a solution of the equation y equals negative 4 x squared? A. left parenthesis negative 2 comma 16 right parenthesis B. left parenthesis 1 comma negative 8 right parenthesis C. left parenthesis 0 comma negative 4

    asked by ffdf on May 7, 2019
  19. algebra 1

    Marissa is a photographer. She sells framed photographs for $100 each and greeting cards for $5 each. The materials for each framed photograph cost $30, and the materials for each greeting card cost $2. Marissa can sell up to 8 framed photographs and 40

    asked by malik on November 22, 2013
  20. intermediate algebra

    Write the equation of the line containing (-3,4) and perpendicular to y = 2/3x + 2. Write your answer in slope-intercept form. Not sure how to do this one. please help.

    asked by jennifer on November 7, 2008
  21. science

    how is this equation derived from the momentum principle? In the near-Earth orbit the rate of change of momentum is (v/R)p = (v/R)mv

    asked by sally on July 11, 2014
  22. Math equation

    A rectangle has a width w that is a 5 units longer than its lengthL. Which equation expresses the rectangle's area, A?

    asked by Anonymous on July 3, 2015
  23. Math

    write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400

    asked by Matt on March 23, 2013
  24. Geometry

    1. What is the equation of the circle with center (-4,-3) that passes through the point (6,2)? A. (x-4)^2+(y-3)^2=25 B. (x-4)^2+(y-3)^2=125 C. (x+4)^2+(y+3)^2=25*** D. (x+4)^2+(y+3)^2=125 I think the answer is C but I'm not sure. Can someone help tell me

    asked by Crystals on May 10, 2017
  25. algebra

    Give the equation of the line that passes through point (5, 1) and is parallel to the line y = 3x – 1. I am so lost. I have no clue how to do this. Can anyone please help?

    asked by sabrina on February 21, 2010
  26. Physics

    What would the equation be for this problem: A bicyclist accelerates at 0.89 m/s/s during a 5 s interval. What is the change in the speed of the bicycle and bicyclist?

    asked by Alyonka on February 10, 2012
  27. Algebra ll

    Write an equation in slope-intercept form for the line that has a slope of -4 and passes through (1,2) Choices: y= -2x+4 y= -4x+6 y= -4x+9

    asked by Carol on September 30, 2009
  28. Help 6!!!

    6. What happens to the graph of the line y = 3x -2 when the equation is changed to y = 3x +6? What do you think happens...how do the slopes compare? The y intercept changes, does it move the line up or down?

    asked by Margie on October 13, 2006
  29. Chemistry

    The equation is N2 + O2 reacts 2NO Given 12.5 mg of oxygen reacts with 21.4 mg of Nitrogen what mass of product is formed

    asked by Nicole on November 15, 2016
  30. math

    Write an equation of the line containing he given point and parallel to the given line? Express your answer in the form y=mx+b (6,8);x+7y=5

    asked by micheal on June 13, 2009
  31. math

    The gradient of a curve at (1,-11) is ax^2 + b at all points. The tangent at (2,-16) is parallel to the x-axis. Find a and b and the equation of the curve

    asked by joseph on June 21, 2016
  32. Pre-Algebra

    Write the given sentence as an equation. Tim's age in 7 years will be three times what it was 19 years ago.

    asked by Amy on March 4, 2013
  33. Math

    Tanya is 62 inches tall. She is 17 inches taller than May. Write an equation that can be used to find out May's height.

    asked by Amy on December 10, 2014
  34. Math!

    Solve the equation on the interval 0

    asked by Hannah on May 7, 2013
  35. Math

    The equation of a nonvertical line, explain how to fine the slope without finding two points on the line.

    asked by Cindy on February 28, 2011
  36. Maths

    Find the equation of a line which is perpendicular to 2x + 3y = 4 passing through ( -5, 1) Can you show mw how to work this out step by step please?

    asked by Remy on September 20, 2009
  37. Calculus

    Convert the curve to an equation in rectangular coordinates: x=sin theta + 1 y=2cos theta - 1

    asked by Elyse on April 16, 2013
  38. Chemistry

    Consider the following generic chemical equation: 2W + 3X ? 3Y + Z When 5 units of W and 6 units of X are allowed to react, the limiting reactant would be: a)W b)x c)Y d)Z

    asked by Anonymous on December 6, 2011
  39. Math

    Write and solve an equation for the situation. Eight and one-half years ago, Steven was 7 years old. How old is he now?

    asked by Bell on December 5, 2012
  40. chemistry

    How many grams of HCl are produced according to the following equation, H2 + Cl2 = 2 HCl, when 4.0 g of hydrogen reacts completely?

    asked by HElp on October 20, 2011
  41. Chemistry

    Give a chemical test for carbon(2) oxide and illustrate your answer with chemical equation

    asked by Yaseerah on May 20, 2015
  42. intermediate algebra

    Write the equation of the line containing (-3,4) and perpendicular to y = 2/3x + 2. Write your answer in slope-intercept form. Not sure how to do this one. please help.

    asked by jennifer on November 6, 2008
  43. math

    sketch the plane x+2y-z=6. if you need help,find a third line by letting z=0 and then graph the resulting equation in the xy plane

    asked by rvb on August 13, 2014
  44. chemistry please help!!

    what is the net ionic equation for the reaction between a strong acid and a strong base? what does it mean by this question?/ (: thanks.

    asked by yvette on March 4, 2013
  45. Physics

    Rearrange the following kinematics equation for the variable iondicated: a)d=v1t+1/2at^2 i)v1 ii)a b)d=v2t-1/2at^2 i)v2 ii)a

    asked by Katie on September 19, 2007
  46. Math

    Solve the equation. Explain each step and identify the property usedbto reach each step. 0.6x + 0.8 = 1.4

    asked by Darkdream on January 18, 2018
  47. Trigonometric

    tan^2 x − 7 tan x − 8 = 0 Use inverse functions where needed to find all solutions of the equation in the interval [0, 2π).

    asked by Diana on March 16, 2015
  48. algebra 1

    USING EQUATIONS THAT FACTOR How to turn fifteen more than the square of a number is eight times the number into an equation.

    asked by kevin on February 9, 2012
  49. math

    Write the equation in slope-intercept form of the line that passes through the point (-3, 5) and has a slope of 2/3.

    asked by sabrina on November 3, 2015
  50. Statistics

    The least absolute deviation line equation for the data in the table is m = 0.1 x + 2.9 X 1,6,0.5,4,7.5,12,10,11 y 3,2.5,8,1,1.5,9,13,4 What is the sum of the absolute deviations?

    asked by BoB on December 12, 2018
  51. Trigonometry

    Write an equation of cotangent with period = 3pi, phase shift = -pi, and vertical shift = -1

    asked by xavier on December 6, 2016
  52. STATS

    7. Calculate b0 and b1 and make an equation of regression line for the set of data given in Table 3 Table 3 x y 1 12 2 15 3 16 5 18 6 21 8 23

    asked by Mary on March 30, 2010
  53. Math

    The sum of three consecutive numbers is 66.Form an equation to represent this information and find these numbers

    asked by Hazel on June 7, 2016
  54. math

    Find the equation of a parabola where the vertix is at origin and the parabola opens to the left and passes through (-1,2).

    asked by pallavi on March 15, 2016
  55. calculus

    the curve with equation 2(x^2+y^2)^2=9(x^2-y^2) is called a lemniscate. find the points on the lemniscate where the tangent is horizontal.

    asked by Lee on October 30, 2011
  56. algebra 1

    Write an equation of the line containing the given point and parallel to the given line. express your answer in the form y=mx+b (-8,4); 9x=7y+5 y= ?

    asked by spirit73 on September 22, 2009
  57. Math

    I don't know how to solve this equation. cos(30) = x / 6 How would I solve this to find the missing side of a 30-60-90 triangle?

    asked by John on May 25, 2018
  58. algebra

    What is the first step to solving the equation: 4(x + 4) = 24 Add 4 to both sides, subtract 4 from both sides, or distribute 4 times x + 4?

    asked by Mudz on May 24, 2017
  59. chemistry

    Why is balanced chemical equation for H2O written 2H2+0>2H20 and not H20>H20?

    asked by jo on September 21, 2009
  60. Chemistry

    how do I write the equation for How many grams of sodium nitrate are required to form 90.0 grams of water?

    asked by dody on December 5, 2010
  61. math

    PLEASE HELP Could someone check my answer? I need to figure out the equation of the circle given the center of (-9,0) and radius of 7. (x-(-9))^2 + (y-0)^2 = 7^2 answer(x+9)^2 + y^2 = 49 is this correct?

    asked by sam on September 20, 2009
  62. algebra-trig help asap

    Write an equation I'm not sure how to do this though. The sine of x with an amplitude of 4, period of 3(pie) and phase shift to the right of pie/4

    asked by missy on May 5, 2012
  63. basic algebra

    Graph the line passing through the given point and having the given slope-intercept form of the equation of the line if possible. (1,-2),m=-1/2

    asked by Camille Byrne on July 29, 2011
  64. Statistics

    Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?

    asked by Julia on December 2, 2012
  65. coordinate algebra

    Which equation describes the proportion: The number of chickens (c) is four times as many the number of horses (h) on the farm.?

    asked by Yannick on July 22, 2014
  66. Graphing Linear Equations and Inequalities

    Fill in the t-table below for the equation. Then graph the line on the grid by selecting two of the points from your table. 3x+4y=-16 x y −4 0 4

    asked by DAISY on November 14, 2016
  67. geometry

    in slope-intercept form, what is the equation of the line passing through (6,22) and parallel to the line joining (11,3) and (2,6)

    asked by Anonymous on May 26, 2011
  68. trig

    How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

    asked by ALISON on December 10, 2011
  69. math

    Which equation shows the correct use of power of products property? a) (2x^5y^2)^3 = 6x5y^2 b) (2x^5y^2)^3 = 6x^15y^6 c) (2x^5y^2)^3 = 8x^8y^5 d) (2x^5y^2)^3 = 8x^15y^6

    asked by victoria on September 11, 2013
  70. Math

    write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400

    asked by Matt on March 23, 2013
  71. math

    i need to solve this equation by completing the square: x^2-14x+1=0 i don't' know how to do this, nor do i know what complete the square means. please help.

    asked by Nic on November 4, 2008
  72. Science

    Express your answer as a balanced net ionic equation. Identify all of the phases in your answer

    asked by libby on February 28, 2011
  73. Chem

    if salt has the solubility product expression Ksp={Br3+}2{S2-}3 what is the equilibrium equation for the solubility?

    asked by Tammy on December 3, 2011
  74. algebra

    Find an equation in slope-intercept form of the line passing through (0, 1) which is parallel to the line y = 6x – 23

    asked by isa on February 10, 2014
  75. physics

    a force accelerates a car of mass 1240 kg at 2 km/hr. what is the force? i need help how do you get the acceleration? i know f=ma but what's the a? or is this the wrong equation?

    asked by Cierra on January 13, 2008
  76. math

    P (5,) and Q (-1, 2) are points on a straight line. Find the equation of the perpendicular bisector of PQ: y = mx+c how to find missing

    asked by kudu on March 14, 2015
  77. math

    use the quadratic formula to solve this equation. 4x^2-8x+3=5 use the formula x=-b + or - the sqrt of b^2-4ac/2a yes, the 2a divides into all. Memorize it.

    asked by kayla on July 12, 2007
  78. Math

    State whether the equation y=10^3x represents a linear, quadratic, or exponential function. Tell how you decided. I think it is exponential

    asked by Lyndse on December 11, 2009
  79. maths

    I've to solve the following absolute value equation: |x - 3| - 4 = 0. I found one of the answers which is 7 i.e. |x - 3| - 4 = 0 x - 7 = 0 x = 7 However, my textbook also includes -1 as the answer. How did they get this answer?

    asked by bindiya farswani on January 30, 2010
  80. algebra

    Find the equation for the graph of the path of a point​ P(x,y) that moves such that​ P(x,y) is the same distance from the point ​(14​,0) and the​ y-axis.

    asked by jacob on December 3, 2016
  81. math

    translate to an equation F $ 0.30 folders and N $1.50 totals $12 can you determine 3 different combination of folders and notebooks that total $12

    asked by brian on December 6, 2011
  82. chemistry

    6. Given the equation below, how many moles of each reactant were there if 13.7 moles of N2(g) is produced? 4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g)

    asked by bliss on March 9, 2016
  83. algebra

    Find an equation in slope-intercept form of the line passing through (0, 1) which is parallel to the line y = 6x – 23

    asked by john on February 10, 2014
  84. intermediate algebra

    Write the equation of the line containing (-3,4) and perpendicular to y = 2/3x + 2. Write your answer in slope-intercept form. Not sure how to do this one. please help.

    asked by jennifer on November 7, 2008
  85. Math

    (-4,8);6x=7y+3 Write the equation of the line containing the given points and parallel to given line express your answer in y=mx+b form

    asked by Chris on October 30, 2011
  86. precalculus

    can you please check my work? 7. Find the equation of the parabola y=ax2+bx+c that passes through the points(0,6),(-2,2), and(3,9/2). y=ax2+bx+c 6=a(0)2+b(0)+c 2=a(-2)2+b(-2)+c 9/2=a(3)2+b(3)+c 6=c 2=4a+(-2b)+6 9/2=9a+3b+6 -4=4a-2b -3/2=9a+3b a=-1/2, b=1

    asked by Anonymous on December 3, 2016
  87. Math

    Suppose that y varies inversely as t he cube of x. If y is 1/2 when x is 2 , find the constant of variation and variation equation

    asked by Mary on August 28, 2014
  88. math

    2x(x-2)=x+3 2x-2=x+3 What error has been made in solving this equation, and what could be done to aviod this error? The 2x was NOT multiplied by the contents of the parenthsis. Should have been 2x2 - 4x

    asked by cheryl on March 19, 2007
  89. math

    Find the standard form of the equation of the circle with the given characteristics. Center: (5, -2); point on circle: (-3, -4)

    asked by mary on May 26, 2018
  90. math

    Could someone check my answer? I need to figure out the equation of the circle given the center of (-9,0) and radius of 7. (x-(-9))^2 + (y-0)^2 = 7^2 answer(x+9)^2 + (y-0)^2 = 49 is this correct?

    asked by sam on September 20, 2009
  91. Statistics

    how do you find equation of the least-squared line (line of best fit) from 2-vars stats and the correlation?

    asked by Bob on October 29, 2009
  92. Math

    I'm having trouble with reciprocal functions. If a graph of a reciprocal function is given, how do you find its equation? Any help would be really appreciated.

    asked by KC on November 24, 2009
  93. Algebra

    Please help...Evaluate the logarithmic equation for three values of x that are greater than 1, three values of x that are between 0 and 1, and at x=1. Show your work. y=log7 x

    asked by J. Ed on June 12, 2010
  94. ALGEBRA

    need help x(to the second power -don't know how to type it on the computer)-7x-30=0 I know the factors are 10 & 3, but I don't know how to write the equation/expression

    asked by Rose on October 14, 2008
  95. Math

    When it says, "Paulo has a certain amount of money. If he spends six dollars, then he has 1/4 of the original amount left." So would the equation be n-6=1/4?

    asked by Nicole on January 9, 2014
  96. algebra

    Suppose you want to add a sprinkler system, and the location of one section of the sprinkler line can be described by the equation .

    asked by frustrated on February 15, 2008
  97. math

    What is the sum of all values of x that satisfy the equation (x2 -5x+5)x2 +4x-60 =1? Hint: There are three cases to consider I think I figured out 2 of the cases. The first one being x2 +4x-60=0 while x2 -5x+5=whatever. The second is x2 -5x+5=1 and x2

    asked by John on January 3, 2016
  98. generate formulas

    A box has a base with an area of 53 cm2 and a height of h. Which equation can be used to find V, the volume of the box?

    asked by johnnny on March 24, 2011
  99. Algebra 2

    solve each equation. check for extraneous solutions. sqrt(2x+1)+sqrt(2x+6)=5 please show work!!!!!

    asked by maria on February 9, 2015
  100. Chemistry

    How would you write an ionic equation for: NH2SO3H + NaOH —> NaNH2SO3 + H2O? Is it simply H+ + OH- —> H2O?

    asked by Autumn on October 9, 2017

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