Most popular questions and responses by nancy
  1. Math

    One car is 3.9 meters long the other is 6%shorter How long is second car? What is the formula I use for questions involving %

    asked on January 4, 2016
  2. maths

    a carpenter has a board that is 8 ft long. he cuts off two piece is 3 1/2 ft long and other is 2 1/3ft long.How much off the board is left.

    asked on February 26, 2015
  3. Chemistry

    A certain indicator, HA, has a Ka value of 1.3 × 10-6. The protonated form of the indicator is blue and the ionized form is red. What is the pKa of the indicator? What is the color of this indicator in a solution with pH = 8? Blue, red, or purple?

    asked on February 26, 2013
  4. english

    Which group of words is the sentence below misplaced? Having been discovered, Fifi looked up at his owner with puppy-dog eyes. a)with puppy-dog eyes b)been discovered c)his owner d)Fifi looked up

    asked on August 4, 2010
  5. Chemistry

    The triprotic acid H3A has ionization constants of Ka1 = 6.8× 10–3, Ka2 = 8.1× 10–9, and Ka3 = 5.0× 10–12. Calculate the following values for a 0.0760 M solution of NaH2A [H+] = ? [H2A-]/[H3A]= ? Calculate the following values for a 0.0760 M

    asked on February 26, 2013
  6. chemistry

    I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find percent by mass of U-238 in rock. I have 4.5x 10^9x60x60x365x24=1.419x 10^17= .693/1.419 x10^17 =4.883x10^-18 =rate 1.6/238=.006722

    asked on June 17, 2012
  7. Chemistry

    What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.22?

    asked on February 26, 2013
  8. Chemistry

    This question has been bugging me for a long time. A rock contains a Pb-206 to U-238 mass ratio of .145 to 1.00. Assuming that it did not contain any Pb-206 at the beginning of its formation, determine its age. I assume from the other problems in my book

    asked on February 23, 2013
  9. Gr.11 Math

    A large company has a phone tree to contact its employees in case of an emergency factory shutdown. Each of the five senior managers calls three eployees, who calls three other employees and so on. If the tree consists of seven levels, how many employees

    asked on January 5, 2009
  10. chemistry

    Find the number of disintegrations per minute emitted by 1.1 mol of 232-Th in 1 min. The half-life of 232-Th is 1.4 x 1010 year I was able to do this with the following technique: 1.1 x 6.022 x10^23 =6.62x10^23 1.4x10^10=7.358x10^15 minutes I think then it

    asked on August 2, 2012
  11. Math

    A letter is chosen randomly from the 26 letters in the alphabet. Find the probability of choosing a consonant.

    asked on March 9, 2016
  12. Chemistry

    Why does equilibrium shift to the left when AgNO3 is added to the equation Co(H20)6 (aq) + 4Cl- (aq) CoCl4 (aq) + 6H2o(l)?

    asked on April 8, 2012
  13. chemistry

    I have a problem like this: CHCl3 + Cl2 = CCl4 +HCL This is the rate table: CHCL3 Cl2 Initial Rate .010 .010 .0035 .020 .010 .0069 .020 .020 .0098 .040 .040 .027 They want me to find the rate constant and the rate law.

    asked on February 23, 2013
  14. Chemistry

    Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? A) 3 B) 4 C) 2 D) 6 E) 5

    asked on November 28, 2011
  15. chemistry

    A 1.50 liter gas sample at 745mm HG and 25 celsius contains 3.55% radon by volume radon-220 is an alpha emitter with a half life of 55.6 seconds. how many alpha particles are emitted in 5 minutes by this sample? I got an answer 1.59x10^19 I started at

    asked on June 17, 2012
  16. physics

    When the thigh is fractured, the patient's leg must be kept under traction. One method of doing so is a variation on the Russell traction apparatus. (See the figure.) Please place period in place of (dot) oi53(dot)tinypic(dot)com/2a0b7yx(dot)jpg If the

    asked on March 4, 2011
  17. calculus

    a toy wagon is pulled by exerting a force of 15 pounds on a handle that makes a 30 degree angle with the horizontal. find the work done in pulling the wagon 50 feet.

    asked on May 12, 2010
  18. Chemistry

    How many moles of ions are released when these samples are dissolved in water? a. 0.37 mol of NH4Cl b. 3.55 * 10^18 formula units of Ba(OH)2 * 8H2O I need to know what steps to take to get to the answer. Thanks!

    asked on November 2, 2009
  19. math

    A clerk spent his 35 hour work week as follows: 1/5 of his time in sorting mail; 1/2 of his time in filing letters; and 1/7 of his time in reception work. The rest of his time was devoted to messenger work. The percentage of time spent on messenger work by

    asked on September 25, 2015
  20. physics

    A racing dog is initially running at 20.0 m/s, but is slowing down. Question: How fast is the dog moving when its kinetic energy has been reduced by half? Question: By what fraction has its kinetic energy been reduced when its speed has been reduced by

    asked on March 21, 2011
  21. Science

    Methanol reacts with carbon monoxide in the presence of a catalyst to produce ethanoic acid. Reacted completely with carbon monoxide in a reaction vessel. What is the theoretic yield of ethanioc acid?

    asked on February 8, 2019
  22. Maths

    In an election there were 3 candidates 3/7 of the electors voted for the winner. The runner up received 5/8 of the remaining votes, what fraction of the electors voted for the third candidate

    asked on June 16, 2016

    A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00

    asked on April 10, 2016
  24. Chemistry

    A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?

    asked on December 6, 2011
  25. Math

    You are the financial manager at Best Buy where a certain TV set is normally sold for $2,500 and the full purchase price is financed for 30 monthly payments at 24% per year compounded monthly, with the payments made at the end of each month. During

    asked on October 22, 2014
  26. Math

    At a summer camp, one boy and one girl will be selected to lead the weekly activities. If there are 130 boys and 145 girls at the camp, how many different 2 person combinations of 1 boy and 1 girl are possible?

    asked on February 5, 2013
  27. chemistry

    1)when benzoic acid and quinine is dissolved in CH2Cl2 and added 2M NaOH, what is the organic layer and what is the aqueous layer? a)and by adding another 2M NaoH to the organic layer, what is the new aqueous layer and organic layer? b)from (1), if we add

    asked on March 31, 2009
  28. Math

    Gabriella is x years old.Her sister Felicia,is six years old than she is.Their mother is twice as old as Felicia.Their aunt,Tanya,is x years older than their mother.Write and simplify an expression that represents Tanya's age in years.

    asked on January 14, 2015
  29. Physics

    How many times will the incident beam shown in Figure P25.3 (x = 1.90 m, y = 1.30 m) be reflected by each of the parallel mirrors? mirror on the right

    asked on November 6, 2008
  30. Statistics

    Suppose x is a uniform random variable with c=10 and d=90. Find the probability that a randomly selected observation exceeds26.

    asked on November 16, 2010
  31. math

    A golf ball is hit off the ground at an angle of pie/6 and it travels 400 ft. How long was the golf ball in the air?

    asked on May 6, 2010
  32. statistics

    The average math SAT score is 500 with a standard deviation of 100. A particular high school claims that its students have unusually high math SAT scores. A random sample of 50 students from this school was selected, and the mean math SAT score was 530. Is

    asked on November 23, 2010
  33. Maths

    Construct a parallelogram ABCD, where AB=7cm ,AC =9cm and /_A = 75°

    asked on February 5, 2017
  34. chemistry

    An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together. A

    asked on October 11, 2014
  35. Math

    You have borrowed $135,000 from the bank today. You are required to repay this money over the next six years by making monthly payments of $2,215.10 at the end of each month. What is the quoted interest rate for the loan (with monthly compounding)? Please

    asked on October 22, 2014
  36. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.100 M phosphoric acid solution. pKa1 = 2.16 pKa2 = 7.21 pKa3 = 12.32 [H3PO4] = ?

    asked on February 26, 2013
  37. math

    there are 7 red balloons and 4 fewer blue ballons. use cube trains to model the set of ballons.

    asked on November 18, 2011
  38. Pre-Calc with Analytic Geometry

    Function : y=cot(2x+pi) 1)determine the interval for the principal cycle. (Type this answer in interval notation) 2)Then for the principal​ cycle, determine the equations of the vertical​ asymptotes. 3)find the coordinates of the center​ point. 4)

    asked on August 4, 2016
  39. Chemistry

    2 NaN3(s) = 2 Na(l) + 3 N2(g) How many grams of NaN3 are needed to produce 20L of N2(g) at 303K and 776mmHg?

    asked on September 24, 2013
  40. Business math

    A store had 896 swimsuits that were marked to sell at $46.99. Each suit was marked down $15.90. Find the reduced price using the formula M = S – N, where M is the markdown, S is the original selling price, and N is the reduced price.

    asked on September 8, 2013
  41. Math

    123 Inc has a profit margin of 15%. Its total asset turnover ratio is 2 and its dividend payout ratio is 60%. What is the company's internal growth rate? Please show steps

    asked on October 23, 2014
  42. Math

    Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions a)

    asked on October 9, 2011
  43. Chemistry

    Can someone help me balance this equation? MnO4(¨C) + H(+) + C2O4(2¨C)--> Mn(2+) + H2O + CO2 Sure but tell us what you don't understand about it. You need to learn how to do them yourself. Tell me what you don't understand, in detail, and I can help you

    asked on April 30, 2007
  44. Language arts

    How should the United States government have behaved in dealing with the disputes between the Cherokees and the white settlers?

    asked on October 23, 2014
  45. science

    A car is moving at a speed of 72 km/hr. The radius of its wheels is 0.25m. If the wheels are stopped in 20 rotation by applying brakes, then angular retardation produced by the brakes is:

    asked on November 29, 2016
  46. Math

    An airline believes that the probability of a passenger being a no-show on a morning flight is 12%. If the airline overbooks a 300 seat morning flight by selling 350 tickets how many empty seats should the airline expect to have on the flight

    asked on September 7, 2016
  47. math

    On a map of the Fox River, 1 centimeter represents 6.5 kilometers. If a trail by the river is actually 26.65 kilometers long, what is the length of the river on the map?

    asked on November 19, 2013
  48. Ap chemistry

    if a 84g sample of thorium decays with a 10 minute half life, how much would the sample weight in a half hour?

    asked on February 27, 2018
  49. programming

    for a list of numbers entered by the user and terminated by 0, find the sum of the positive numbers and the negative numbers

    asked on May 16, 2010
  50. Chemisty

    If ten drops of 0.3 M HCl are mixed with ten drops of 0.3 M Na2S2O3, what will be the concentration of each chemical in the mixture? Please help, i am pretty sure that the concentration should be 0.3 M but i am not sure if i am supposed to do somthing with

    asked on January 7, 2009
  51. Science

    Why is the formation of iron hydroxide, Fe(OH)2, from Fe2+ and OH- not considered an oxidation-reduction reaction?

    asked on March 11, 2008
  52. Life orientation

    3 human rights violations or discrimination and explain in an introductory paragraph why you choose the specific human rights violations or discrimination

    asked on May 15, 2016
  53. Physics

    A 0.500 kg particle moves in a circle of R=0.0150 m at constant speed. The time for 20 complete revolutions is 31.7 s. What is the period T of the motion? What is the speed of the particle? What is the centripetal acceleration of the particle? What is the

    asked on March 5, 2013
  54. Calc.

    Find the minimum cost of producing 20,000 units of a product, where x is the number of units of labor (at$48 per unit) and y is the number of units of capital (at $36 per unit). P(x,y)=100x^.6y^.4

    asked on December 9, 2010
  55. science(physics)

    A powerful motorcycle can accelerate from rest to 28m/s in only 4 second . a.what is its average acceleration? far does it travel in that time

    asked on September 21, 2016
  56. Algebra 1- 8th Grade

    What is the relationship between the x-intercepts of a parabola and its vertex's x-coordinate?

    asked on March 29, 2009
  57. Math

    You have the following data for the Fosberg Winery. What is Fosberg's return on assets (ROA)? Return on equity = 15%; Earnings before taxes = $30,000; Total asset turnover = 0.80; Profit margin = 4.5%; Tax rate = 35%.

    asked on October 23, 2014
  58. Math

    A population grows exponentially at a rate of 2.6% per year. How long will it take for the population to triple?

    asked on December 14, 2016
  59. Math

    Pey Soon has taken out a 20-year, $150,000 mortgage with monthly payments (made at the end of each month) at a stated mortgage rate of 6.8% per year compounded semi-annually. If she makes each payment on time, what will be the mortgage principal remaining

    asked on October 23, 2014
  60. U.S History

    help please What challenges did the United States face after the overthrow of saddam Hussein? Please help me ASAP thank you

    asked on December 12, 2011
  61. british literature

    review the metrical feet box on page 35 in your study guis and the model of scanned poem in your textbook page 42. then ,scan the following sonnet 73. mark the syllables, separate the feet with shorts vertical lines, and indicate the rhythem scheme that

    asked on July 18, 2011
  62. Physics

    A daredevil plans to bungee jump from a balloon 64.0 m above a carnival midway. He will use a uniform elastic cord, tied to a harness around his body, to stop his fall at a point 10.0 m above the ground. Model his body as a particle and the cord as having

    asked on February 29, 2008
  63. Geometry

    Find the measure of each side of equilateral triagnle RST with RS = 2x + 2, ST = 3x, and TR + 5x -4.

    asked on November 9, 2010
  64. 8th Algebra

    What are some real-life examples of exponential growth and decay?

    asked on April 20, 2009
  65. Chemistry

    An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g). If 395mL O2 is collected over water at 25C and 749.2mmHg barometric pressure, then what is the percent by mass of AgO2 in the sample? The vapor pressure of water at 25C is 23.8mmHg.

    asked on September 27, 2013
  66. chemistry

    The escape velocity from earth is 2.5 x10^4 miles per hour. What is this speed in m/s? (1 mile 1609 m)

    asked on April 14, 2013
  67. Math

    On friday, a computer was priced at $800. on the following wednesday, the price was reduced by 15%. On the following friday, the price was further reduced by 20%. what percent of the original price was the final price ?

    asked on February 5, 2013
  68. Chemistry- rate laws

    CH3CHO decomposes into methane gas and carbon monoxide gas. This is a 2nd order reaction. Rate of decomposition at 140 degrees Celsius is .10M/s when the concentration of CH3CHO is .010. What is the rate of the reaction when the concentration of CH3CHO is

    asked on September 18, 2012
  69. Math

    A bucket that weighs 3.2 pounds and a rope of negligible weight are used to draw water from a well that is 82 feet deep. The bucket is filled with 42 pounds of water and is pulled up at a rate of 2.3 feet per second, but water leaks out of a hole in the

    asked on February 6, 2011
  70. statistic

    The amount of time a bank teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If a random sample of 16 customers is selected, a) what assumption must be made in order to solve parts (b) and (c)? b)

    asked on April 7, 2012
  71. Calc.

    a bomb is dropped drom an airplane at an altitude of 14,400 feet how long would it take to reach the ground? (because the motion of the plane, the fall will not be vertical, but the time will be the same as that for a vertical fall.) the plane is moving at

    asked on December 9, 2009
  72. Ict

    Uses Of Ict In Timing And Control

    asked on April 26, 2019
  73. Trig

    A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.

    asked on April 21, 2013
  74. Science

    Write correct formulas for the products in these combustion reactions.C6H6 + O2=

    asked on July 29, 2017
  75. chemistry

    I need help with this lab. Write the equation for the decomposition of the hydrate, CuSO4*XH2O. Mass of crucible and hydrate: 93.000g Mass of crucible and pure salt: 91.196g I need to calculate the following: 1. mass of water in hydrate sample(g) 2. number

    asked on November 8, 2012
  76. College Algebra

    A coin jar contains nickels, dimes and quarters. There are 46 coins in all. There are 11 more nickels than quarters. The value of the dimes is $1.00 less than the value of the quarters. How many coins of each type are in the jar?

    asked on April 26, 2011
  77. Global History

    How were European nations able to dominate non-European areas?

    asked on February 16, 2010
  78. Algebra

    1) Two cars leave town at the same time going in opposite directions. One travels 44 mi/h and the other travels 55 mi/h. In how many hours will they be 297 miles apart? 2) Two cars leave town at the same time going the same direction on the same road. One

    asked on March 7, 2009
  79. physics

    A dart leaves the barrel of a blowgun at a speed v. The length of the blowgun barrel is L. Assume that the acceleration of the dart in the barrel is uniform. If the darts exit speed is 17 m/s and the length of the blowgun is 1.10 m, find the time the dart

    asked on October 11, 2015
  80. Math

    a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma

    asked on March 1, 2012
  81. global studies

    the four major kinds of plant life in the United states are:tundra,grassland,desert scrub, and? Thank you for using the Jiskha Homework Help Forum. What about forests and flowering plants? P.S. Although the following link may not answer your question, it

    asked on March 19, 2007
  82. Chemistry

    Complete and balance the following (CH3)2NH(aq)+CH3COOH(aq)→ CH3CH2NH2(aq)+HBr(aq)→ CH3NH2(aq)+HCOOH(aq)→

    asked on May 27, 2014
  83. math/algebra

    Elena bought 49 packs of red balloons, 66 packs of blue balloons, and 35 packs of yellow balloons. Each contained 12 balloons. She mixed them up and gave away some balloons. She then repacked the balance into packs of 25. QUESTION A: How many balloons were

    asked on October 30, 2018
  84. stat

    In a random sample of 200 registered voters, 150 indicated they are Democrats. Develop a 99% confidence interval for the proportion of registered voters in the population who are Democrats.

    asked on April 17, 2017
  85. Math

    Given the following information: current assets = $400; fixed assets = $500; accounts payable = $100; notes payable = $45; long-term debt = $455; equity = $300; sales = $450; costs = $400; tax rate = 34%. Suppose that current assets, costs, and accounts

    asked on October 23, 2014
  86. Chemistry

    The nuclide 38cl decays by beta emission with a half life of 40min. A sample of .40 m of H38cl is placed in a 6.24 liter container. After 80 min the pressure is 1650 mmHg. What is temperature of container? I have tried calculating the decay rate of the

    asked on July 21, 2013
  87. algebra/logs

    I don't understand this problem: (1/2)n = 0.015625 n log 0.5 = log 0.015625 n = log 0.5 / log 0.015625 n = 6 When I plug log .5 into the calculator it gives .3010 and when I plug .15625 to the calculator it is -1.806 and that would be -.3010/-1.806 =.1666.

    asked on August 2, 2012
  88. Chemistry

    I don't know if I should be posting this on a new session or just the old one; I asked it yesterday and I have not seen a reply I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find

    asked on June 18, 2012
  89. science

    a 5.o kg book is sitting on a table. which describes the forces acting on the book? a)there are no forces acting on the book b)the net force on the book is zero Since the weight of the book is cancelled out by the support of the table. does that mean a)

    asked on August 7, 2010
  90. calculus

    a circle of radius 1 rolls around the outside of a circle of radius 2 without slipping. the curve traced by a point on the circumfarence of the smaller circle is callled an epicycloid. use the angle theta to find a set of parametric equations for this

    asked on May 12, 2010


    asked on March 2, 2019
  92. Statistics

    The table to the right lists probabilities for the corresponding numbers of girls in three births. What is the random​ variable, what are its possible​ values, and are its values​ numerical? Number of girls x ​P(x) 0 0.125 1 0.375 2 0.375 3 0.125

    asked on March 2, 2017
  93. physics

    An apple falls from a tree and hits the ground 10.9 m below. With what speed will it hit the ground? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s.

    asked on October 8, 2017
  94. Chemistry Check

    Determine the missing values of deltaH in the diagram shown below ^ | ^ N2O3(g) + 1/2 O2(g) (Enthalpy)| | ^ | | deltaH= +16.02 | | | | | | 2 NO2(g) | | | ^ | |deltaH=? | | | | | | deltaH=?| | | | | | | | N2(g)+202(g) | Answer: Delta H for the right= 66.36

    asked on October 18, 2014

    A voltaic cell is constructed that uses the following reaction and operates at 298 K: 2 Al(s) + 3 Mn^2+(aq) 2 Al^3+(aq) + 3 Mn(s). What is the potential, E, of this cell when [Mn^2+] = 0.10 M and [Al^3+] = 1.5 M?

    asked on March 16, 2014
  96. veterinary medicine

    A pet owner accidentally applies 2.5 ml of a dog flea product containing 45% permethrin to a 15 lb cat. What is the dosage this cat received?

    asked on July 12, 2010
  97. calculus

    a circle of radius 1 rolls around the outside of a circle of radius 2 without slipping. the curve traced by a point on the circumfarence of the smaller circle is callled an epicycloid. use the angle theta to find a set of parametric equations for this

    asked on May 11, 2010
  98. College Algebra

    A sailboat has a triangular sail with an area of 20 square feet. The height of the sail is 6 feet more than the length of the base of the sail. Find the height of the sail.

    asked on January 18, 2016
  99. Healthcare Statistics

    As a data collection specialist at the National Institutes of Health (NIH), you have been involved in a research study conducted over the past year. The study found that liver cancer rates per 100,000 males among cigarette smokers to nonsnmokers, in a

    asked on March 8, 2015
  100. earth

    Why is the Earth's atmosphere rich in oxygen and poor in carbon dioxide?

    asked on August 18, 2011


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