Popular questions and responses by Kim
  1. statistic

    A lottery ticket has a grand prize of $28 million. The probability of winning the grand prize is .000000023. Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Show your calculations and reasoning clearly.

    asked on August 27, 2010
  2. math

    In the middle of the page, draw two circles an inch apart. Then draw a slight arch going up from the right edge of the left circle to the left edge of the right circle. Then draw a diagonal line out from the left edge of the left circle. This line should

    asked on February 29, 2016
  3. chemistry

    Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1 Element Symbol: ? Ground State: ?

    asked on September 30, 2013
  4. Calculus Help Please!!!

    Compute Δy and dy for the given values of x and dx = Δx. (Round your answers to three decimal places.) y = 3x − x^2, x = 3, Δx = −0.6 Δy=???

    asked on March 30, 2014
  5. Trigonometry

    A painter needs to cover a triangular region 62 meters by 68 meters by 70 meters. A can of paint covers 70 square meters. How many cans will be needed?

    asked on April 24, 2009
  6. Chemistry

    I have a few question about an equilibrium lab we performed. Approximately .1 g of CoCl2 * 6H2O was mixed with 2 mL of 12 M HCl. The solution turned blue. Then, water was added and stirred into the solution in 2 mL incriments until no further color change

    asked on May 29, 2007
  7. Accounting - Please check me

    Indicate whether a debit or credit decreases the normal balance of each of the following accounts. Office Supplies- debit Repair Service Revenue- debit Interest Payable- debit Accounts Receivable- creditSalaries Expense- debit Owner Capital- credit Prepaid

    asked on April 8, 2008
  8. Calculus Help

    A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is L(t) = 12 + 2.8 sin[(2π/365)(t − 80)]. Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and April 21.

    asked on March 9, 2014
  9. math

    if you pick a number between 1 and 100 inclusive what is the probability of picking a number which is not a multiple of 27

    asked on July 8, 2020
  10. Chemistry

    Write the formulas of the compounds formed by NH4+ with the following anions: CN-, ClO3-, SO42-, H2PO4-

    asked on November 25, 2015
  11. chem 101

    How many kilojoules of heat are needed to completely vaporize 42.8 g of C4H10O at its boiling point? Given Hvap=26.5kj/mol

    asked on April 14, 2014
  12. chemistry

    which pair(s) of liquids will be miscible ? H2O AND CH3CH2CH2CH2CH3(PENTANE) C6H6 (BENZENE) AND CCl4(CHLOROFORM) C2H5OH (ETHANOL) AND CH3COOH(ACETIC ACID) how do you know if they are miscible?

    asked on March 16, 2012

    Rate of Change You are given the dollar value of a product in 2008 and the rate at which the value of the product is expected to change the nest 5 years. write a linear equation that gives the dollar value V of the product in terms of the yeart.(let t= 0

    asked on September 26, 2009
  14. math

    f(x)= 6x + 6 if f is 0 and 5?

    asked on July 8, 2020
  15. Spanish please help!

    Complete each sentence with the correct form of the verb in parentheses. 1. La clase de matemáticas (terminar) a las cuatro. 2. ¿Te gusta (estudiar) psicología? 3. La profesora (explicar) el mapa. 4. Necesito (comprar) el libro de español. 5. Ustedes

    asked on March 10, 2013
  16. Early childhood

    School-age children generally develop writing skills in which sequence? A.Expressive writing,expository writing,story B.Exposity writing,story writing,expressive writing. C.Expressive writing,story writing,expository. Story writing,expository

    asked on March 15, 2011
  17. AP Chemistry

    what is the molecular shape of OCCl2 ion? C is the central atom. Options: 1. seesaw 2. tetrahedral 3. trigonal pyramidal 4. trigonal planar 5. trigonal bypyramidal 6. octahedral

    asked on July 14, 2010
  18. Calculus-Modeling Equations

    An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent. 1.What is the half-life of the element? 2.How long will it take for a sample of 100 mg to decay to 46 mg?

    asked on March 6, 2009
  19. Maths

    Principal - 6000 Rate - 5% Effective Date - May 15 Maturity Date - November 1 Partial Payment Amount - $1500 Partial Payment Date -August 15 Also Answer the following questions: 1. NUMBER OF DAYS BETWEEN EFFECTIVE DATE AND PARTIAL PAYMENT = 2. INTEREST ON

    asked on March 10, 2008
  20. geometry

    2 complementary angles are in the ratio of 5:13. Find the measure of each angle?

    asked on March 28, 2010
  21. Math

    Which of the following is a factor of both x2- x-6 and x2 - 5x + 6

    asked on March 13, 2017
  22. Math

    Betty has the option of using three types of tables in her coffee shop: square tables with a side length of 42 inches; rectangular tables 26 inches wide and 73 2/3 inches long; and round tables with a diameter of 36 inches. Which of the tables has the

    asked on November 7, 2017
  23. chemistry

    Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)LiNo3(aq)+LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate

    asked on April 29, 2015
  24. Chemistry

    We performed a lab in class about a month ago concerning different types of equilibrium. One particular portion of the lab adding 5 mL of .3M HCl to 5 mL of .3 M Pb(NO3)2. After a precipitate finally formed, 8 mL of water was added to dissolve PbCl2. One

    asked on May 28, 2007
  25. math

    The probability of not picking a purple marble out of a bag of marbles is 2/5, if 2 purple marbles are taken out of the bag, reducing the number of purple marbles to 4, what will the new probability of picking a purple marble be?

    asked on December 6, 2013
  26. General Chemistry

    A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What volume of solvent has evaporated from the 0.275 M solution? a)42.2 mL b)63.3 mL c)187.8 mL d)230 mL e)272.2 mL

    asked on June 20, 2012

    1. When McDonald’s Corp. reduced the price of its Big Mac by 75 percent if customers also purchased french fries and a soft drink, The Wall Street Journal reported that the company was hoping the novel promotion would revive its U.S. sales growth. It

    asked on July 31, 2011
  28. Physics

    A constant force is exerted for a short time interval on a cart that is initially at rest on an air track. This force gives the cart a certain final speed. Suppose we repeat the experiment but, instead of starting from rest, the cart is already moving with

    asked on February 6, 2015
  29. Ohlone

    how many moles of oxygen are consumed in burning 1.6 moles of benzene, C6H6?

    asked on October 7, 2010
  30. calculus

    Find f(x+ (delta)x)- f(x) --------------------- (delta)x if f(x)=8x(squared)+ 1 This is so confusing! What is all the delta x stuff?

    asked on September 18, 2008
  31. statistics

    A school club consists of 22 male students and 15 female students. If 3 students are selected to represent the club in the student government, what is the probability 2 will be male and 1 will be female?

    asked on March 19, 2017
  32. math

    write a negation of the statement...not all people like football

    asked on September 20, 2011

    Private colleges and universities rely on money contributed by individuals and corporations for their operating expenses. Much of this money is put into a fund called an endowment, and the college spends only the interest earned by the fund. A recent

    asked on February 15, 2011
  34. Math

    Suppose you draw a card from an ordinary deck of playing cards What are the odds in favor of drawing a face card? b. What are the odds against drawing a face card?

    asked on October 7, 2015
  35. physics

    What will a spring scale read for the weight of a 50 kg woman in an elevator that moves as follows? (a) upward with constant speed of 3.0 m/s Enter a number.1 N (b) downward with constant speed of 3.0 m/s Enter a number.2 N (c) upward with acceleration of

    asked on December 18, 2009
  36. history

    What are the checks on the power of the judiciary? Are they potent and easily invoked or weak and difficult to invoke?

    asked on November 30, 2008
  37. physics

    a baseball is batted with a speed of 120 ft/sec at an angle of 37 degrees with the ground. find how long the ball is in the air, how high the ball goes, how far from the plate it is caught, and the components of the velocity of the ball 4 sec after it is

    asked on September 21, 2016
  38. General Chemistry

    At STP, a 5.00L flask filled with air has a mass of 543.251g. The air in the flask is replaced with another gas and the mass of the flask is 566.107g. The density of air is 1.29g/L. What is the gas that replaced the air?

    asked on June 20, 2012
  39. math

    round to the nearest thousand, nearest hundred, nearest ten 8999

    asked on October 7, 2010
  40. Cash Budgeting Question

    Cash Budgeting – Helen Bowers, owner of Helen’s Fashion Designs, is planning to request a line of credit from her bank. She has estimated the following sales forecasts for the firm for parts of 2006 and 2007: May 2006 $180,000 June

    asked on December 10, 2006
  41. chemistry

    a metal object has a mass of 8.37g. when it was placed in a graduated cylinder containing 20.0ml of water, the water level rose to 23.1 ml. what is the density and identity of the metal?

    asked on February 16, 2014
  42. Math

    The elephants at the zoo are fed 1/2 barrel of corn each day. The buffalo are fed 7/10 as much corn as the elephants. How many barrels of corn are the buffalo fed each day?

    asked on February 26, 2013
  43. Chem

    Calculate the number of C atoms in 0.185 C6H14O.

    asked on September 28, 2012
  44. Chem

    I stuck on this problem. Can you help me to solve it? A reaction mixture in a 3.67L flask at a certain temp. initially contains 0.763g H2 and 96.9g I2. At equilibrium, the flask contains 90.4g HI. Calculate the equilibrium constant(Kc) for the reaction at

    asked on October 17, 2010
  45. physics- PLEASE HELP

    2. A .12 kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. What is the change in the magnitude of the momentum of the ball? 4. Lonnie pitches a baseball of mass .2 kg. The ball arrives at home

    asked on December 3, 2008
  46. Vectors

    A plane is steering east at a speed of 240km/h. What is the ground speed of the plane if the wind is from the northwest at 65km/h. What is the plane's actual direction?

    asked on May 25, 2018
  47. Vectors

    A plane is steering east at a speed of 240km/h. What is the ground speed of the plane if the wind is from the northwest at 65km/h. What is the plane's actual direction?

    asked on May 25, 2018
  48. Math

    An Italian food restaurant claims that with the choices of toppings that they offer on their pizzas, you can order about 65,550 different types of pizza. How many toppings do they offer?

    asked on February 20, 2013
  49. chemistry

    which solution has highest freezing point if all are at the same molality calcium chloride sodium nitrate potassium sulfate iron(III) nitrate all have same freezing point please explain

    asked on March 16, 2012
  50. math

    I need help rounding 423,607,492 to the following place values. ten thousands million Please tell us what you think, and we'll be glad to comment on your answers. Starting at the ten thousands digit, it is now 07,492, so rounding it to the nearest, is one

    asked on April 22, 2007
  51. math

    What is AB x BC?

    asked on October 15, 2014
  52. PM

    You are creating a customer database for Modesto Nuts minor league baseball team. Draw a project network given the information below. Complete the forward and backward pass, compute activity slack, and identify the critical path. How long will this project

    asked on August 1, 2013
  53. Math

    A parking lot contains a total of 52 cars and motorcycles. There are a total of 186 tires (not counting spare tires) in the lot. Assuming each car has 4 tires and each motorcycle has 2 tires, determine how many cars and how many motorcycles are in the

    asked on February 20, 2013
  54. data management

    A survey of 1000 veiwers conducted by a television station produced the following data: 40% watched the news at 12:00 60% watched the news at 18:00 50% watched the news at 23:00 25% watched at 12:00 and 18:00 20% watched at 12:00 and 18:00 20% watched at

    asked on November 6, 2011
  55. Algebra

    Steve is making bags of mixed nuts. Almonds are $5 per pound & Cashews are $12 per pound. Steve charges $56 per 7 pound bag. 1. Write a system of equations that can be used to determine how many pounds of almonds & how many pounds of cashews Steve uses. 2.

    asked on July 18, 2018
  56. Seattle central college

    Which of the following is author’s opinion a. Olmsted - was appoint superintendent and worker began cleaning the land for construction. b. After a vote by park commissioner, Vaux and Olmsted become the officer design of Central Park. c. Calvert Vaux, a

    asked on March 21, 2018
  57. FSCJ

    please help!! A storage tank 32 m high is filled with pure water. (Assume the tank is open and exposed to the atmosphere at the top.) (a) Find the gauge pressure at the bottom of the tank. (b) Calculate the magnitude of the net force that acts on a square

    asked on February 12, 2017
  58. Algebra

    Find all points on the x-axis that are 10 units from the point (7, 6). (Hint: First write the distance formula with (7, 6) as one of the points and (x, 0) as the other point.)

    asked on October 6, 2014
  59. Help Please!!!!

    The oral evacuation system is held with the _______ grasp. A. thumb-to-nose B. palm C. thumb-ring D. pinky-to-nose I said B and was wrong. Thank you!

    asked on August 9, 2014
  60. statistic

    The random variable x represents the number of boys in a family with three children. Assuming that births of boys and girls are equally likely, find the mean and standard deviation for the random variable x.

    asked on August 20, 2013
  61. chemistry

    The charge and identity of an ion with 16 protons, 18 electrons and 17 neutrons would be?

    asked on February 6, 2013
  62. Chemistry

    The mass of a single barium atom is 2.28E-22 grams. How many barium atoms would there be in 182 milligrams of barium?

    asked on January 23, 2013
  63. Chemistry

    C15H30 is a hydrocarbon that reacts with oxygen gas to give carbon dioxide and water. Calculate the mass of water (grams) formed when 724.05 grams of the hydrocarbon reacts with the oxygen gas.

    asked on November 14, 2011
  64. physics

    A solid sphere of weight 36.0 N rolls up an incline at an angle of 30.0o. At the bottom of the incline the center of mass of the sphere has a translational speed of 4.90 m s-1. Isphere = 2/5mr^2. What is the kinetic energy of the sphere at the bottom of

    asked on November 13, 2008
  65. Declaration of Independence

    What are the key points of the declaration of independence? List a main idea for each paragraph; then let us know what YOU think. Someone here will give you feedback. =) One of the unwritten things, to me, not

    asked on January 23, 2007
  66. Chemistry

    What is the variable x in the following hydrate formula NaCl xH2O if the mass of sodium chloride is 58g and the mass of the water is 36g

    asked on June 28, 2016
  67. math

    In right triangle ABC,BC=8cm and AC=17cm.Find the value of sin C

    asked on January 13, 2016
  68. math

    Maria needed 5 gallons of gas to fill her​ car's gas tank. The mileage odometer read 34,300 miles. When the odometer read 34,528 Maria filled the tank with 12 gallons. At the end of the​ trip, she filled the tank with 17 gallons, and the odometer read

    asked on October 8, 2015
  69. management

    1. Regarding management and leadership, which statement is most accurate? A. Leaders can be good managers, and good managers can be leaders. B. Leaders aren’t managers, and managers aren’t leaders. C. Leadership and management are entirely unrelated.

    asked on August 22, 2012
  70. Pre Calculus

    Find the measure of the central angle, in radians, given the area of the sector as 22.6 cm2 and a radius equal to 3.7 cm. Round your answer to the nearest tenth.

    asked on March 23, 2011
  71. Chemistry

    Lithium nitride reacts with water to form ammonia and aqueous lithium hydroxide. Li3N(s) + 3H2O(l) ==> NH3(g) + 3LiOH(aq) a)What mass of water is needed to react with 32.9g Li3N? b)When the above reaction takes place, how many molecules of NH3 are

    asked on April 5, 2010

    1. A 4.0 N force acts for 3 seconds on an object. The force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to the object? 2. A railroad freight car, mass 15,000 kg, is allowed to coast along a level track

    asked on December 4, 2008
  73. calculus

    Suppose the revenue (in thousands of dollars) for the sales of 'x' hundred units of an electronic item is given by the function R(x)= 40x^2e^ -0.4x +30. where the maximum capacity of the plant is 800 units. Determine the number of units to produce in order

    asked on April 29, 2018
  74. Pre Algebra

    “A pre-algebra book is 8 1 half Click for more options inches by 9 1 fourth Click for more options inches. Determine the perimeter of the textbook. Describe the steps you took to solve this problem.

    asked on March 30, 2018
  75. Math

    An electron weighs about 10^(-27) grams, and a raindrop weighs about 10^(-3). a raindrop is 24 times heavier than an electron. an electron is 24 times lighter than a raindrop. but idk what is the order of multitude difference.. or how to calculate it... i

    asked on February 27, 2017
  76. Math, number and operations base

    I have 8 thousands,17 tens, 5 hundreds, and 12 ones. What number am I?

    asked on September 15, 2016
  77. physics

    Two charges +q and −q are separated by a distance d. Find an expression for the potential difference VBA = VB − VA, where points A and B are both a distance b from the charges. 

    asked on March 21, 2016
  78. chemistry

    29.0g Ag combine completely with 4.30g S to form a compound. what is the percent composition of each element in this compound

    asked on November 19, 2014

    1)Each state has a dental board of examiners responsible for enforcing that particular state's Dental Practices Act (DPA). The DPA contains similar requirements for dentist conduct. Which of the following is not covered by the DPA? A. Americans with

    asked on August 7, 2014
  80. Math

    Javia ran 8 laps around a track to run a total of 1 mile on Monday. How many laps will she need to run on Tuesday to run 3/8 of a mile?

    asked on February 26, 2013
  81. statistics

    A lottery offers one $800 prize, one $400 prize, and ten $80 prizes. One thousand tickets are sold at $3 each. Find the expectation if a person buts two tickets. Assume that each ticket can win more than one prize.

    asked on October 26, 2012
  82. chemistry

    A sample of gas has an initial volume of 14.7L at a pressure of 1.02 atm. If the sample is compressed to a volume of 10.2L, what will its pressure be?

    asked on February 28, 2012
  83. statistics

    An auditor of Health Maintenance Services reports 40 percent of policyholders 55 years and older submit a claim during the year. Fifteen policyholders are selected at random for company records. a)how many of the policyholders would you expect to have

    asked on March 26, 2011
  84. calculus, please help

    A fish is reeled in at a rate of 3.2 feet per second from a point 10 feet above the water (see figure). At what rate is the angle between the line and the water changing when there is a total of 25 feet of line out? (Round your answer to three decimal

    asked on October 14, 2010
  85. Chemistry

    Calculate the enthalpy change (delta H) in kJ for the following reaction. 2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy changes for the combustion of aluminum and iron. 2Al(s) + 3/2 O2(g) ==> Al2O3(s) Delta H: -1669.8 kJ 2Fe(s) + 3/2 O2(g) ==>

    asked on May 23, 2010
  86. English

    correct or incorrect? Sally wants a new bicycle,but her mother and father will not buy her one. My little sister is a big baby;she cries all the time. Mr.Smith,my spanish teacher,is going on vacation. Parents want their children to go to college;however

    asked on May 18, 2010
  87. Physics

    How much energy is needed to melt 0.225 kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celsius and is poured in the mold immediately after it has melted. Not sure if this is

    asked on March 30, 2010
  88. physics

    An electric force moves a charge of +1.80×10-4 C from point A to point B and performs +5.80×10-3 J of work on the charge. (a) What is the change in the electrical potential energy of the charge as it moves from A to B? (b) Determine the potential

    asked on February 13, 2019
  89. Statistics

    Suppose x is a uniform random variable with values ranging from 20 to 70. Find the probability that a randomly selected observation is between 23 and 65.

    asked on April 13, 2017
  90. Math

    Impulses in nerve fibers travel at a speed of 293 ft./sec . the distance D traveled in T seconds is given by D =293t . how long would it take an impulse to travel from the brain to the toes of a person who is 6 feet tall? My answer: 6ft=293t 6/293=0.020477

    asked on February 2, 2016
  91. Algebra

    The height in feet of a projectile with an initial velocity of 32 feet per second and an initial height of 240 feet is a function of time in seconds given by h(t) = −16t2 + 32t + 240. (a) Find the maximum height of the projectile. ______ ft (b) Find the

    asked on November 3, 2014
  92. math

    Under normal circumstances 1.5 feet of snow will melt into 2 inches of water. After a recent snowstorm, there were 3.5 feet of snow. How many inches of water will there be when the snow melts.

    asked on March 3, 2013
  93. math

    Write 0.026 As a sum using powers of 10 to show place value

    asked on February 11, 2013
  94. logic

    Sometimes people get caught in a “downward spiral,” a case in which something leads to a result which in turn leads to more of the original thing, bringing on more of the result. As the process continues, the result continually gets worse and worse. An

    asked on October 31, 2010
  95. physics

    Two particles, with identical positive charges and a separation of 2.60 x 10^-2 m, are released from rest. Immediately after the release, particle 1 has an acceleration a1 whose magnitude is 4.60 x 10^3 m/s^2, while particle 2 has an acceleration a 2 whose

    asked on April 26, 2010
  96. Chemistry

    When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g) what is the theoretical yield of iron?

    asked on March 28, 2010
  97. physics

    What displacemtn at 70 degrees has an x-component of 450m? What is its y-component? I know the answers are 1.3 and 1.2... but don't know how to work it out?? PLEASE HELP!!

    asked on February 3, 2010
  98. Chem

    1) A 15.0 g sample of nickel metal is heated to 100.0 C and dropped into 55.0 g of water, initially at 23.0 C. Calculate the final temperature of the nickel and the water, if the specific heat capacity of nickel is 0.444 j / g x C. 2) In a coffee-cup

    asked on November 11, 2008
  99. Organic Chemistry

    Why is benzyl chloride reactive in both tests, whereas bromobenzene is unreactive?

    asked on November 2, 2008
  100. Algebra

    Find the equation for the line L. Note the x-coordinate of the point Q is 3, y-coordinate of the point P is 17, and the parabola has equation y=x^2+4.

    asked on February 1, 2020


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