Popular questions and responses by Lori
  1. Chemistry

    A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

    asked on November 9, 2013
  2. Statistics

    Roll two standard dice and add the numbers. What is the probability of getting a number larger that 9 for the first time on the third time.

    asked on September 19, 2010
  3. Statistics

    Working of a problem--I have found the mean, variance and the standard deviation from the following info: The probability that a cellular phone company Kiosk sells X number of new phone contracts per day is shown below---- X=4, 5, 6, 8, 10 P(X)=0.4, 0.3,

    asked on September 25, 2010
  4. Math

    What multiplication fact can be found by using the arrays for 2x9 and 5x9?

    asked on February 11, 2008
  5. calculus

    suppose the quantity demanded per week of a certain dress is related to the unit price p by the demand equation p=sqrt800-x. write the function that describes the revenue function? To maximize revenue how many dresses should be made and sold each week?

    asked on March 29, 2013
  6. ochemistry

    How many pi-electrons are in the thiazoline ring of thiamine hydrochloride? of thiamine?

    asked on July 5, 2011
  7. chemistry-stoichiometry

    how many grams of chlorine can be liberated from the decomposition of 64.0g of AuCl3 by this reaction 2 AuCl3----> 2 Au + 3cl2

    asked on May 19, 2008
  8. Statistics

    In a department store there are 120 customers, 90 of whom will buy at least 1 item. If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item.

    asked on September 19, 2010
  9. Chem

    A patient receives 3.2 L of glucose solution intravenously (IV). If 100. mL of the solution contains 5.0 g of glucose (carbohydrate), how many kilocalories did the patient obtain from the glucose solution? *If anyone could help me with this, please show

    asked on September 3, 2018
  10. Chemistry

    1.69 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the solution?

    asked on April 22, 2011
  11. math

    there was 3/4 of a pizza left over from a family gathering. The next day, Tina ate 1/2 of what was left. How much of the whole pizza did Tina eat?

    asked on December 9, 2015
  12. Chemistry

    if you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution, what is the molarity of the solution

    asked on May 13, 2014
  13. math word problems

    Sally and marta had the same number of postcards. After sally sold 18 of her postcards, marta had 4 times as many postcards as sally. How many postcards did each girl have to begin with?

    asked on October 2, 2011
  14. Early Childhood Literacy

    Children with many experiences with stories: A-can accurately sound out words. B-tend to know stories have predicitable segments and features C-can read simple words as was or am by late preschool years. D-realize words are separated in sentences and that

    asked on July 4, 2012
  15. Grammar

    what is the agreement error in the following sentence: One of the options concerning his future surgeries were discussed with him.

    asked on September 23, 2011
  16. ochemistry

    Why might the presence of Benzoic acid be deleterious to the Benzoin condensation?

    asked on July 5, 2011
  17. Trig

    What is the exact value of cot(4pi/3)? Do not use a calculator.

    asked on February 28, 2010
  18. Chemistry

    in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.

    asked on November 21, 2014
  19. Statistics

    A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If all answers are random guesses, estimate the probability of getting at least 20% correct? Trouble with deciding p, n, q, and P (X)

    asked on October 8, 2010
  20. pre-cal

    what are the steps to solve sec y sin (pi/2-y)=1

    asked on January 12, 2010
  21. Physics

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked on February 23, 2013
  22. social studies

    What is an example of a nonrenewable resource?

    asked on September 4, 2012
  23. financial management

    A capital project has an initial investment of $100,000 and cash flows in years 1-6 of $25,000, $10,000, $50,000, $10,000, $10,000, and $60,000, respectively. Given a 15 percent cost of capital, •(a) compute the net present value. . •(b) compute the

    asked on April 14, 2014
  24. calculus optimization problem

    A farmer has 460 feet of fencing with which to enclose a rectangular grazing pen next to a barn. The farmer will use the barn as one side of the pen, and will use the fencing for the other three sides. find the dimension of the pen with the maximum area?

    asked on March 30, 2013
  25. Chemistry

    I need to solve latent heat. It gives me the number of ice cubes and the mass in grams (7550 grams). It wants to know how many calories would burn turning the ice into body temperature water (if body temp is 37 degrees celsius.) It gives Lm of H2O=1,44

    asked on January 24, 2013
  26. singapore moth

    Place the following digits in the boxes so that the sum of the digits in each straight line is the same. This is like a crossword 3 boxes across and 3 boxes down then 3 boxes across and 3 boxes down using digits 1,2,3,4,5,6,7,8,9. please help with answer.

    asked on November 4, 2012
  27. Chemistry Kb question need to clarify something

    the pKb for methylamine is 3.36, what is the Kb for methylamine? pKa+pKb= 14.00 Kb= 10^-pKb = 4.4x10^-4 is the answer but HOW?? what is punched into the calculator to get 4.4 x 10^-4??

    asked on December 16, 2010
  28. Chem

    Given the reaction: C8H16 + 12O2 --> 8CO2 + 8H2O How many moles of H2O are produced when 11.2 liters of C8H16 gas, measured at STP, reacts completely?

    asked on December 14, 2010
  29. Chem

    What is the percent by mass of oxygen in Al2O3?

    asked on December 14, 2010
  30. statistics

    Women comprise 80.3% of all elementary school teachers. In a random sample of 300 elementary teachers, what is the probability that more the 3/4 are women?

    asked on October 9, 2010
  31. Statistics

    What z-value corresponds to the 18th percentile?

    asked on October 3, 2010
  32. Stat

    An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?

    asked on September 26, 2010
  33. Statistics

    The probability that a person owns a microwave oven is .75, that a person owns a compact disk player is .25, and that a person owns both a microwave and a CD player is .16. Find the probability that a person owns either a microwave or a CD player, but not

    asked on September 23, 2010
  34. Algebra HELP!

    solve 7x+5(-3x-4)=-21-7x 7x+(-15x-20=-7x-21 -8x-20=-7x-21 7 7 -8x-20+7x=-21 -1x-20=-21 20 20 -1x/-1 = -1/-1 x=1

    asked on March 21, 2008
  35. Math

    Hi! Can someone help me with this? Thanks! Directions: Solve this equation by doing it twice; one time using the substitution method and one time using the graphing method. x – 2y = 0 3x – y^2 = 0

    asked on March 2, 2015
  36. algebra

    electricity costs 7.57 a month plus 8.77 per kilo watt hour for the first 400 kWhr and 6.574 per kWhr for all useage over 400 in a month. what is the cost for 300 kWhr? 2638 What is the cost of 700? 7.57+8.77 times 400 and 6.574 times 300? 5487.77 I think.

    asked on February 23, 2013
  37. Chemistry

    Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen

    asked on February 21, 2013
  38. Math

    A jar contains 6 red marbles and 10 blur marbles all of equal size. if Dominic were to randomly select 1 marble without replacement and then select another marble from the jar, what would be the probability of selecting 2 red marbles from the jar.

    asked on April 8, 2012
  39. Intro.Criminal Justice

    which sentencing philosophy is best suited for cybercrimes

    asked on December 6, 2011
  40. Chemistry

    What are the products for the reaction of Sodium hydrogen phosphate with nickel II nitrate Ni2HPO4 + Ni(NO3)2 -->

    asked on September 20, 2011
  41. Statistics

    In a given normal distribution, the standard deviation is 14.4 and 8.27% of the distribution lies to the left of 60. What is the mean?

    asked on October 3, 2010
  42. statistics

    A student takes a 20-question, true/false exam and guessed on each question. Find the probability of passing if the lowest passing grade is 15 correct out of 20.

    asked on September 26, 2010
  43. Psydag--stat

    An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?

    asked on September 26, 2010
  44. PreCalc

    An isosceles triangle is a triangle with two sides that are the same length. Find the measure of the two equal angles to the nearest degree in a triangle that has sides of length 5ft., 5ft., and 6ft.

    asked on April 7, 2010
  45. Chemistry

    For the reaction of hydrazine (N2H4) in water, Kb is 3.0 10-6. H2NNH2(aq) + H2O(l) H2NNH3+(aq) + OH -(aq) Calculate the concentrations of all species and the pH of a 2.2 M solution of hydrazine in water. okay so i don't know how to do this problem because

    asked on February 14, 2009
  46. algebra 2

    a swimming pool 50m by 25 m is to be built with a walkway w meters wide around it write the total area of the pool and walk way in the form ax exponet 2 +bx+c

    asked on November 1, 2006
  47. math grade 5

    Name each number in two different ways. 90,000,000 40,000

    asked on September 18, 2018
  48. Science

    If I want to do an experiment to find which route to class is faster (route 1 or route 2), what would be my control group and what would be my treatment group in the experiment?

    asked on January 29, 2018
  49. tribal government

    if the tribal government don't recognize judicial board does separation of powers still work

    asked on December 10, 2016
  50. Economics

    Suppose the market demand and supply are given by Qs = -50 + 3P and Qd = 300 - 4P. What is the equilibrium price? ? is the answer 50

    asked on May 22, 2016
  51. Chemistry

    If the percent (mass/mass) for a solute is 6% and the mass of the solution is 300 g., what is the mass of solute in solution?

    asked on March 14, 2016
  52. chemistry

    If the solubility of gas in water is 5.0g/L when the pressure of the gas about the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/L?

    asked on March 14, 2016
  53. Algebra

    I need help with the following question: (2 + p)(r+ 9) = (r + 9)(2 + p) Is this communtative property? Thank you very much for all your help.

    asked on August 19, 2015
  54. written communication

    If you blank to visit your grandmother, you should go now; visiting hours will be ending soon.

    asked on May 13, 2015
  55. Chemistry

    step by step, show how to balance C2H5OH + K2Cr2O7 + H2SO4 = Cr2(SO4)3 + K2SO4 + CH3COOH + H2O

    asked on November 11, 2014
  56. Pre-Calc

    Describe the difference between transformations and nonrigid transformations.

    asked on September 26, 2014
  57. analytical chemistry

    Suppose a 4.272 g soil sample undergoes an extraction with 50 ml of extracting solvent to remove the lead. This 50 ml was then diluted to 250 ml and tested by atomic absorption technique. The concentration of lead in this diluted extract was found to be

    asked on March 5, 2014
  58. Fundamentals of Finance

    I've posted 2 different questions on the above mentioned and no one has helped with the questions, or if it was than how to I go about finding them. HELP! I'm so lost here!

    asked on January 15, 2014
  59. chemistry

    For the following chemical reaction write the net ionic equation, including the phases. 2HBr (aq) +Ba(OH)2(aq) --> 2H2O(l) +BaBr2 (aq)

    asked on November 9, 2013
  60. College Physics PLEASE HELP

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked on February 23, 2013
  61. Chemistry

    A laboratory stockroom has a stock solution of 90%(m/v) sulfuric acid,H2SO4(aq). If a technician dilutes 50ml of the stock solution to a final volume of 300ml, what will be the new mass/volume percent concentration?(HINT: the dilution formula can be used

    asked on February 21, 2013
  62. albebra

    a cubic millimeter of the blood contains 22 to the 3rd power of white blood cells and 22 to the 5th power of red blood cells What is the ratio of whiteblood cells to red blood cells?

    asked on February 18, 2013
  63. Education/Technology

    Syllabi, class outlines, and discipline reports are practical applications of A) systems procedures. B) spreadsheet functions. C) database functions. D) word processing packages. I answer is C, it sounds where all three of these would be, is this correct?

    asked on February 14, 2013
  64. Education/Technology

    To get instant feedback for assessment, such as physical education fitness, a music lab activity, or reading competency, students have been shown how to use A) scanners or punch cards. B) handheld computers or PDAs. C) desktop or laptop computers. D)

    asked on February 14, 2013
  65. Chemistry

    15.0 moles of gas are in a 6.00L tank at 298.15K. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300 L^2*atm/mol^2 and b=0.0430 L/mol. I found the idea gas

    asked on September 13, 2012
  66. Physics

    An object with mass 3.7 is attached to a spring with spring stiffness constant 270 and is executing simple harmonic motion. When the object is 2.5×10−2 from its equilibrium position, it is moving with a speed of 0.45 . what is the amplitude of the

    asked on August 30, 2012
  67. Math

    The perimeter of a rectangle equals the sum of the length of its four sides.If the width of the rectangle if 7 inches and its perimeter is 48 inches, what is the length of the rectangle?

    asked on August 1, 2012
  68. Math

    Need to make a monthly amortization schedule. Borrowing 16000 over 4 years at 3.5%. Do I need to calculate for 48 months in order to do this project correctly? I do all the calcs for 48 months and I still end up with approx a payment left over?

    asked on June 15, 2012
  69. chemistry

    The Haber process for ammonia synthesis is exothermic: N2(g) + 3H2(g) 2NH3(g) ∆H° = -92 kJ If the equilibrium constant Kc for this process at 500.°C is 6.0 ξ 10-2, what is its value at 300.°C?

    asked on March 8, 2012
  70. Quality management/performance improvement

    as a health information management coding supervisor, you have been asked to compare the steps of the current coding process with a proposed coding process. what would be the best tool to use for this process? a. Root-cause analysis b. scatter diagram c.

    asked on January 19, 2012
  71. algebra

    What is 34 divided by 24 in a lowest form

    asked on January 11, 2012
  72. Algebra

    How many three symbol codes using the digits 3 through 9 are possible if repetitions are allowed? (243 is an example of a three symbol code).

    asked on November 15, 2011
  73. Grammar

    Thx, Sue!!! Can u please help me with these others. Agreement errors: 1) Verb tense error 2) subject verb error 3) pronoun agreement error 4) modifer placement error 5) parallel structure error Q:The patient is thin, combative, uncooperative, oriented only

    asked on September 23, 2011
  74. geometry

    Given the following sets, select the statement below that is NOT true. A = {b, l, a, z, e, r}, B = {b, a, l, e}, C = {a, b, l, e}, D = {l, a, b}, E = {a, b, l} (Points : 2) E ⊂ C C ⊆ B D ⊆ C B ⊆ C C ⊆ D

    asked on June 27, 2011
  75. Algebra 2

    The speed of the current is 5m/h. Angie goes upstream 25 miles and returns to the doc. The whole trip takes 12 hours. What is the speed of the boat in still water?

    asked on May 11, 2011
  76. Algebra

    Is y=3x+67 a linear equation?

    asked on April 19, 2011
  77. chem

    The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium perchlorate in the solution. (B) the molarity of potassium

    asked on December 14, 2010
  78. Statistics

    If I deal you one card from a standard deck of 52 and it is a face card, I will give you a $5.00 bill. There are 12 face cards. There is one catch: You have to pay me something to play this game. How much would that be if the game is to be fair?

    asked on September 26, 2010
  79. Math

    3{[3(x-5)15]-[3(4x-3) +3]} I need help to simply this. I have been working on this for 2 hours and still don’t get it, can anyone help?

    asked on April 25, 2010
  80. Business

    can you help me with this if you can In reviewing the office's profit and loss statement, the office manager notices a discrepancy between the stated revenue and cash deposits. In fact, it appears the office may have incorrectly booked $250,000 in revenue

    asked on March 13, 2010
  81. Business

    can you help me with this if you can In reviewing the office's profit and loss statement, the office manager notices a discrepancy between the stated revenue and cash deposits. In fact, it appears the office may have incorrectly booked $250,000 in revenue

    asked on March 9, 2010
  82. College Math II

    Solve by using the quadratic formula. x^2 + 6x + 6 = 0 I am having problems using the quadratic formula to get the right answer. Can someone show me the steps that I use? Thanks.

    asked on November 21, 2009
  83. chemistry

    If 1.000 kcal of heat is added to 1.700 L of oxygen in a cylinder at constant pressure of 1.00 atm, the volume increases to 2.100 L. Calculate the total energy change for this process. Pay careful attention to units. Some plz help me :(

    asked on November 19, 2009
  84. Anatomy

    What lipoprotein is associated with cholesterol and the production changes in blood vessles?

    asked on January 30, 2009
  85. math

    I have 440 feet of fence. After fencing in a square region, I have 136 feet of fence left

    asked on May 20, 2017
  86. Physics

    The Little Prince is a fictional character who lives on a very small planet as shown in the figure below. Suppose that the planet has a mass of 1.95 1013 kg and a radius of 1.06 103 m. (a) How long would it take for an object to fall from rest a vertical

    asked on May 18, 2017
  87. math

    need to write an equation only for: four less than half a number

    asked on March 13, 2017
  88. math

    What is the function rule with input of 18,6,10,22,4,14 and output of 13,7,9,_,_. The last 2 outputs are blank as we need to figure out the rule and then fill in the blanks.

    asked on January 23, 2017
  89. Science

    why can't a model of the solar system be proportionate in distance b/w the planets and size of the planets? I think that a scale model that is proportionate could include both

    asked on January 19, 2017
  90. political

    when there is no judicial board is there seperation of powers for political

    asked on December 10, 2016
  91. probability

    If a soccer team won 60% of the games in which its players scored 5 or more goals, what is the probability of choosing a game in in which the team scored 0-4 goals and won the game? The season so far is they have won 3 games scoring 0-4 goals, won 3 games

    asked on December 8, 2016
  92. Pre algebra

    A coin is tossed and a number cube is rolled. What is the probability that the coin shows heads and the number cube shows 6?

    asked on May 20, 2016
  93. Chemistry

    In a laboratory, the following reaction is performed by combining 358 g of H2O and a sufficient amount of CaC2. The percent yield for this reaction is 94.5%. Calculate the actual yield of acetylene (C2H2) in grams from this reaction. CaC2 + 2H2O C2H2 +

    asked on May 1, 2016
  94. Math

    How many 1/2 sq ft tiles to cover a desk that is 5 1/2 ft long and 3 1/2 ft wide?

    asked on April 12, 2016
  95. Math w/business apps

    How much should be invested at 6% compounded monthly so that the investment will be worth $20,000 in six years?

    asked on April 8, 2016
  96. Chemistry

    What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)

    asked on March 14, 2016
  97. English

    Can you please check if my answers are correct? 1.)The pupil had not(brang, brought) the homework. Answer: The pupil had not brought the homework. 2.) Has the choir ever(sung,sang) that tune? Answer: Has the choir ever sung that tune? 3.) The seamstress

    asked on March 12, 2016
  98. Introduction to Computer Applications

    I am doing and assignment that requires a short story or narrative poem of my choice to summarize and such. any suggestions or recommendations on short stories?

    asked on February 12, 2016
  99. Math

    Sara bought 2 boards of wood one board is 18 inches the other is 30 inches she wants to cut the wood into longest equal parts with no wood left over does Sara have enough wood for 10 equal size peices

    asked on February 3, 2016
  100. English

    Cross out prepositional phrases. Underline the subject once and the verb/verb phrase twice. Identify adv. 1.) The discussion between Lori and her mother was regarding their weekend plans. Subject: discussion Verb: was regarding Phrase: between Lori and her

    asked on February 1, 2016


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