Most popular questions and responses by karen
  1. chemistry

    Write the balanced equation for the neutralization reaction between H3PO4 and NaOH in aqueous solution. Phases are optional.

    asked on May 14, 2014
  2. trig

    use a half-angle identity to find the exact value of tan 105 degrees.

    asked on July 22, 2013
  3. english

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

    asked on October 31, 2010
  4. math

    what is the effective interest rate of an 8% 13-week treasury bill? assume it is a $10,00 treasury bill, and round to the nearest hundredth percent

    asked on June 5, 2017
  5. Physics

    A student performs a ballistic pendulum experiment using an apparatus similar to that shown in the figure. Initially the bullet is fired at the block while the block is at rest (at its lowest swing point). After the bullet hits the block, the block rises

    asked on February 20, 2014
  6. Whatzit puzzle

    more it it thani

    asked on September 9, 2011
  7. Chemistry

    What are the three essential parts to make a battery? Cell reducing agent acid fuse porous barrier or salt bridge voltage regulator oxidizing agent

    asked on May 14, 2014
  8. Math

    A quadrilateral contains two equal sides measuring 12 cm each with an included right angle. If the measure of the third side is 8 cm and the angle opposite the right angle is 120 degrees, find the fourth side and the area of the quadrilateral.

    asked on February 2, 2015
  9. chemistry

    Calculate the concentration of all species in a 0.20 M KF solution.

    asked on March 7, 2017
  10. Biochemistry

    What is the condensed structural formula of cyclopropane?

    asked on August 21, 2017
  11. Geometry

    Stephanie casts a shadow of 1.2m and she is 1.8m tall. A wind turbine casts a shadow of 10m at the same time that Stephanie measured her shadow. Draw a diagram of this situation and then calculate how tall the wind turbine is.

    asked on January 11, 2014
  12. Statistics

    An airline reports that if has been experiencing a 15% rate of no-shows on advanced reservations. Among 150 advanced reservations, find the probability that there will be fewer than 20 no-shows.

    asked on February 16, 2013
  13. english

    Which words/phrase in this sentence is misplaced? Having been discovered, Rover looked up at his owner with puppy-dog eyes. a. with puppy-dog eyes b. been discovered c. his owner d. rover looked up I am torn between (a.) and (c.). Since the answer (c.)

    asked on January 28, 2011
  14. physics

    A human hair is approximately 55 µm in diameter. Express this diameter in meters. Answer in units of m

    asked on October 22, 2012
  15. math

    please help! 1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1. 2.) A random number between 1 and 20 (inclusive) is chosen. The probability that

    asked on August 11, 2012
  16. Calculus-Math

    The ordering and transportation cost C for components used in a manufacturing process is approximated by the function below, where C is measured in thousands of dollars and x is the order size in hundreds. C(x) = 12((1/x)+((x)/(x+3))) (a) Verify that C(2)

    asked on September 15, 2014
  17. chemistry

    for the reaction S2F6 (g) 2SF2(g), the equilibrium concentrations are as follows: [S26]=0.000430M, [SF2]=2.08 M, [F2]=1.32M. the equilibrium constant is

    asked on November 13, 2011
  18. Literature

    I am desperate for help with this assignment...a short chapter by chapter analysis of the book The Secret Life of Bees by Sue Monk Kidd.I need to summarize the plot of each chapter, include what I found out about the characters in each chapter, list any

    asked on January 31, 2013
  19. chem

    calculate the standard enthalpy change for each of the following reactions. N2O4(g)+4H2(g)=N2(g)+4H2O(g)

    asked on March 4, 2012
  20. Chemistry

    If 4.39 g AlCl3 is dissolved in enough water to make exactly 100.0ml of a solution, what is the molar concentration of the chloride ion?

    asked on March 31, 2018
  21. physics

    The Graph above shows the speed of a car traveling in a straight line as a function of time. The car accelerates uniformly and reaches a speed Vb of 4.00 m/s in 8.00 seconds. Calculate the distance traveled by the car from a time of 1.20 to 4.40 seconds.

    asked on September 8, 2013
  22. chemistry

    what is the volume of 62.3 g of nitrogen gas at STP

    asked on April 11, 2010
  23. physics

    A 0.5 kg soccer ball is kicked with a force of 50 Newtons for 0.2 sec. The ball was at rest before the kick. What is the speed of the soccer ball after the kick?

    asked on January 23, 2014
  24. Math

    A shoe box is an example of what geometric solid?

    asked on March 22, 2009
  25. Accounting

    A credit to a liability account was posted to an owner's equity account. This would cause __________. A. assets to be overstated B. liabilities to be understated C. owner's equity to be understated D. net income to be overstated i think its D A credit to

    asked on February 21, 2015
  26. economics

    When an economist says that a currency has become stronger, he or she means that a) it will buy less of foreign goods. b)it can be exchanged for more of a foreign currency. c)services, unlike goods, can be exported freely. d)there are very few things that

    asked on January 9, 2012
  27. English - Oedipus Rex

    I have to find evidence to support which character I think it the most guilty for what happens to Oedipus. I was just wondering if anyone knows whether or not Sophocles is trying to point the finger at someone other than Oedipus, who I think is the most

    asked on September 23, 2009
  28. Ap Calculus

    Find the area of the region bounded by the curves y=x^2-1 and y=cos(x). Give your answer correct to 2 decimal places

    asked on February 13, 2019
  29. statistics

    Given the following scatter diagram , the sample correlation coefficient r: Has a positive linear correlation Has a negative linear correlation. Has little or no correlation. Looks close to + 1.00

    asked on August 19, 2010
  30. ECE

    At which grade level is it most appropriate for children to group by more than one attribute? A. Primary B. Kindergarten C.Four years old D.Preschool

    asked on August 8, 2011
  31. Math

    You deposit $1000 in an account at the Lifelong Trust Savings and Loan that pays 7% interest compounded quarterly. By how much will your deposit have grown after 4 years?

    asked on March 9, 2009
  32. chemistry

    kilojoules released when 80.0g of steam condenses at 100 ∘C and to cool the liquid and freeze it at 0 ∘C I used the formula for condensation/ evaporation( 80.0g(2260)1kJ/1000J=632.8) and then i used the formula for heat of

    asked on September 15, 2014
  33. Chemistry

    How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

    asked on March 2, 2016
  34. Calculus

    If f is a function such that (f(b) - f(a))/(b-a) =2, then which of the following statements must be true a) f(a) = f(b) =2 b) the slope of the tangent line to the function at x =a is 2 c) The average rate of change of the function on the interval [a,b] is

    asked on December 20, 2018
  35. Chemistry

    To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 10.9 g, and its initial temperature is -12.0 °C. The water resulting from the melted ice reaches the temperature of your skin, 29.6 °C. How much

    asked on April 12, 2014
  36. math

    Jeremy takes out a 30-year mortgage of 220000 dollars at an annual interest rate of 7 percent compounded monthly, with the first payment due in one month. How much does he owe on the loan immediately after the 87th payment? I have tried 204311.1024, but

    asked on September 16, 2016
  37. Algebra 1,Part 2

    As cars passed a checkpoint ,the following speeds were clocked and recorded. Speed (mph):55,62,61,54,68,72,59,61,70) Find the mean and the range of the data set .

    asked on March 5, 2013
  38. Calculus

    In the space below, provide the larger of the positive integers that add to 10 and have the largest possible product

    asked on December 26, 2018
  39. Math

    write and solve two subtraction problem that show how many of each animal therw might be. then write the numbersthey are four different kind of animals on the farm there are 19 More cows than sheep there are 19 more ducks than hens there more hens than cow

    asked on January 14, 2019
  40. Math

    Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.? i am in grade 11 :), studying ahead of the class :) its 8 pm here, this

    asked on January 3, 2016
  41. Math

    Explain whether a function that has a slope of 0 can have the attribute of symmetry. . My answer is yes, because even though there is no slope you still have a possibility of it being symmetrical to the y axis depending on the domain. Am I correct

    asked on August 26, 2015
  42. Chemistry

    The radius of a magnesium atom is 160 pm & its mass is 4.04 X 10^-23 g. What is the density of the atom in grams per cubic centimeter? Assume the atom is a sphere with: Volume= (4/3)*pi*r^3

    asked on August 23, 2017
  43. Spanish 2

    Dear Profesora, Can you check my answers? 11 of 21 Grammar Questions: Choose the best answer to express the given statement or question. Creo que el poema ______________ por Pablo Neruda. escribió fue escrito** fuera escrito escriba unable to answer

    asked on August 13, 2015
  44. science-physics

    A worker sits at one end of a 183-N uniform rod that is 2.80 m long. A weight of 107 N is placed at the other end of the rod. The rod is balanced when the pivot is 0.670 m from the worker. Calculate the weight of the worker

    asked on May 15, 2013
  45. statistics

    Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced

    asked on August 17, 2010
  46. World history

    1Which of the following would john locke most favor Republic Oligarchy Theocracy Absolute monarchy 2Whay was james i resistant to working with parliament He believed in the absolute power of kings He did not agree with the policies of the prime minister

    asked on August 10, 2016
  47. Calculus

    Find an equation of the tangent line to the graph of the function f through the point (x0, y0) not on the graph. To find the point of tangency (x, y) on the graph of f, solve the following equation of f '(x). f '(x) = y0 − y/x0 − x f(x) = √x (x0, y0)

    asked on August 4, 2014
  48. Calculus

    Find the range of the function F(x)= integral from negative 6 to x of √(36-t^2) dt

    asked on March 12, 2019
  49. math

    At the ruins of Caesarea, archaeologists discovered a huge hydraulic concrete block with a volume of 945 cubic meters. The block's dimensions are x meters high by 12x - 15 meters long by 12x - 21 meters wide. What is the height of the block? I have no idea

    asked on October 9, 2013
  50. probability

    please help! 1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1. 2.) A random number between 1 and 20 (inclusive) is chosen. The probability that

    asked on August 11, 2012
  51. Trigonometry

    Solve the equation, where 0° ≤ x < 360°. Round approximate solutions to the nearest tenth of a degree. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.) 3 sin x − 3 cos x = 1

    asked on October 22, 2014
  52. Literature/The Crucible

    Can you help me with these two questions thanks. Acts 1 and 2 Cause and effect relationships The Crucible Directions: Fill in the blanks to show what happened (effect) as a result of specific action (cause) 1. Because Sarah Good had mumbled in Mary

    asked on October 21, 2010
  53. Business and Finance

    Jeff Jones earns $1,200 per week. He is married and claims four withholding allowances. The FICA rate is as follows: Social Security rate is 6.2% on $97,500; Medicare rate is 1.45%. To date his cumulative wages are $6,000. Each paycheck, his employer also

    asked on August 13, 2013
  54. algebra

    please help! The following equation can be used to predict the average height of boys anywhere between birth and 15 years old: y = 2.79x +25.64 where x is the age (in years) and y is the height (in inches). a. What does the slope represent in this problem?

    asked on August 10, 2012
  55. geometry

    M is the midpoint of JK. find the coordinates of K. 1. J (-8,4) M (-1,1) 2. J (9,-5) M (5, -2) 3. J (0,11) M (-3,2)

    asked on September 21, 2015
  56. math

    1. Corey needs 24 boards that are 47.5 inches How many feet of board should he buy and then explain. 2. If you can only buy 8 foot boards, how many should he buy? and then explain.

    asked on January 24, 2013
  57. Trigonometry

    The value V, of a $100,000 investment that earns 3% annual interest is given by V=f(t) where t is in years. How much is the investment worth in 3 years

    asked on January 15, 2013
  58. American Government

    Why did the framers insist that federal judges be appointed for a lifetime of service?

    asked on December 12, 2016
  59. English

    I'm having a hard time with the meter & feet part of my work today. I just don't really get it. Help me with the practice/study questions? (I put a star by the one's I think are right, but the last few I just have no idea.) What metric foot is represented

    asked on December 1, 2009
  60. Spanish

    Que te gusta hacer? My choices are (A).A mi tambien (B).No,no me gusta. (C).No,me gusta Tampico. (D).Me gusta montar en monopatin

    asked on March 12, 2013
  61. math

    the probability of an event is 7/10. Find the odds in favor of this event occurring.

    asked on March 7, 2012
  62. physics

    A 3kg ball is accelerated from rest to a speed of 10 m/s. What is the ball's change in momentum?

    asked on January 23, 2014
  63. physics

    A Boeing 787 is initially moving down the runway at 3.0 m/s preparing for takeoff. The pilot pulls on the throttle so that the engines give the plane a constant acceleration of 1.7 m/s2. The plane then travels a distance of 1900 m down the runway before

    asked on September 8, 2013
  64. Algebra 1 Part 2

    Simplify the rational expressions.State any excluded values:(1).3x-6/x-2 (2).x-2/x^2+3x-10

    asked on March 5, 2013
  65. geometry

    Quadrilateral ABCD is similar to quadrilateral WXYZ. Side BC is 8.6 units in length, side AD is 23.1 units, and side WZ measures 15.8 units. What is the measure of side XY?

    asked on July 3, 2012
  66. algebra II Part 2

    The equation h=7 cos{pi/3 t} models the height h in centimeters after t seconds of a weight attached to the end of a spring that has been stretched an then released. (C).Find the times at which the weight is at a height of 1 cm,of 3 cm,and of 5 cm below

    asked on May 19, 2013
  67. Chemistry

    How many milliliters of 4.25 M H2SO4(aq) are needed to react completely with 45.9 g of BaO2(s)?

    asked on May 14, 2014
  68. Physics

    A ceiling fan is rotating at 0.70 rev/s. When turned off, it slows uniformly to a stop in 2.9 s. (a) How many revolutions does it make in this time? (b)Using the result from part (a), find the number of revolutions the fan must make for its speed to

    asked on November 16, 2010
  69. Statistics

    A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P

    asked on February 13, 2016
  70. stats

    a die is rolled 10 times. find the chance of.... a)not getting 10 sixes b)all the rolls showing 5 spots or less I'm not sure how to do either, but for b, I think is it (5/6)^10 because each time there is a chance that the number will be 5 or less? Please

    asked on February 22, 2011
  71. Trigonometry

    Round answer to two significant digits. An airplane flew 300 miles at a bearing of N65°E from airport A to airport B. The plane then flew at a bearing of S38°E to airport C. Find the distance from A to C if the bearing from airport A to airport C is

    asked on October 22, 2014
  72. physics

    a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help!

    asked on October 15, 2008
  73. physics

    A net force of 100 newtons is applied to a 20 kg cart that is already moving at 3 meters per second. The final speed of the cart was 8 m/s. For how long was the force applied?

    asked on January 23, 2014
  74. College Math

    Ed Moura has $29,000 invested in stocks paying 5%. How much additional money should he invest in certificates of deposit paying 2% so that the average return on the two investments is 3%?

    asked on September 1, 2011
  75. statistics

    Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the quake below the surface at the epicenter.

    asked on August 20, 2010
  76. eco

    Assume that American rice sells for $100 per bushel, Japanese rice sells for 16,000 yen per bushel, and the nominal exchange rate is 80 yen per dollar. Suppose that rice is the only commodity in the world. What would happen to the real exchange rate

    asked on November 19, 2008
  77. Calculus

    A gallon rises at the rate of 8 feet per second from a point on the ground 12 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the ball on is 9 feet above the ground. Type your answer

    asked on December 19, 2018

    1) What are the equilibrium solutions to the differential equation and determine if it is stable or unstable with the initial condition y(-4)=1: 0.1(y+2)(4-y) 2) Use Euler's method with step size=0.5 and initial condition y(0)=3 to solve the equation

    asked on December 8, 2014
  79. Chemical Bonding

    Predict the type of bond present between carbon and suffer in vulcanized runbber? Is that ionic. Please tell me how I can figure out what bonds are present in different chemical reactions. Like phospherous nad oxygen in a DNA molecule. CS bond is covalent.

    asked on January 14, 2007
  80. 6th Grade Math

    Caleb sold boxes of candy. Some sold for $2, and some sold for $3. He sold a total of 35 boxes and received $92. How many boxes did he sell for $2?

    asked on October 7, 2015
  81. math

    anna bought 3 types of fruit for a fruit salad. She paid three times as much for buleberries as for pears and $2.50 less for strawberries than for blueberries. A) define a variable and write algebraic expressions to represent the amount she spent on each

    asked on November 24, 2012
  82. Trigonometry

    An airplane flew 300 miles at a bearing of N65°E from airport A to airport B. The plane then flew at a bearing of S38°E to airport C. Find the distance from A to C if the bearing from airport A to airport C is S60°E.

    asked on November 6, 2014
  83. Calculus

    A particle moves along the x-axis so that at time "t" its position is given by s(t)=(t+3)(t-1)^3 ,t>0 For what values of "t" is the velocity of the particle increasing? a) 00 d) the velocity is never increasing

    asked on December 26, 2018
  84. science

    A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

    asked on November 22, 2015
  85. statistics

    A jar contains 2 pennies, 6 nickels and 4 dimes. A child selects 2 coins at random without replacement from the jar. Let X represent the amount in cents of the selected coins. a. Find the probability X = 11. b. Find the expected value of X

    asked on April 13, 2019
  86. Calculus

    Given f'(x)=(2-x)(6-x), determine the intervals on which f(x) is increasing or decreasing Options: 1) Decreasing (-∞,2); increasing on (6,∞) 2) Decreasing (2,6); increasing on (-∞,2)U(6,∞) 3) Decreasing (-∞,2)U(6,∞); increasing on (2,6) 4)

    asked on December 26, 2018
  87. Ap algebra

    Question 1: if a function is undefined at a point can that point be its domain. Explain Question 2: explain what is meant by the minimum value of a function

    asked on August 26, 2015
  88. Corporate Finance

    Finding the Capital Structure Fama's Llamas has a weighted average cost of capital of 9.8 percent. The company's cost of equity is 15 percent, and its cost of debt is 7.5 percent. Tha tax rate is 35 percent. What is Fama's debt-equity ratio?

    asked on August 21, 2012
  89. finance

    I need help bad. You have been running your small business, Craft’s Boat Shop, for several years now and have been very successful.  You have come to the point where you expect sales to increase next year and want to be sure that you have enough assets

    asked on September 2, 2014
  90. PHYSICS!!!

    A neutron, a proton, and an electron are initially at the same distance from a relatively large stationary nucleus moving at a constant velocity. Assume the masses of the proton and neutron are equal. 1. Which is the first particle to reach the nucleus? 2.

    asked on March 23, 2008
  91. math

    Samantha has five objects weighing 1kg,2kg,3kg,4kg and 5kg. If she weighs them two at a time, how many different weighs can she get?

    asked on March 15, 2015
  92. Economics

    Suppose George is making $18 an hour installing electronic chips in hand held computers. Would you offer to work for $8 an hour to get you the job? Why might a profit-maximizing employer turn down you offer?

    asked on February 18, 2012
  93. Chemistry

    Three isotopes of Neon occur naturally: 20Ne (mass = 19.9924 amu) 21Ne (mass = 20.9938 amu) 22Ne (mass = 21.9914 amu) If the percent abundance of 21Ne is 0.2600, what is the percent abundance of 20Ne? How do I set up for these type of problems. I tried

    asked on February 12, 2016
  94. Spanish

    Form complete sentences using the information provided. Use indirect object pronouns and the present tense of the verb. el vendedor/ traer/ las camisetas/ a mis amigos y a mí el vendedor traer la camisetas a mis amigos y a mi.

    asked on February 24, 2015
  95. world geography

    In Iceland and the British Isles, the ocean creates a __________________ . a. mild temperatures c. hot and humid temperatures b. cold and wet temperatures d. hot and dry temperatures

    asked on December 13, 2013
  96. physics

    3. A man leaves his home by car and travels 5 km on a road running due East. The driver then turns left and travels 2 km due north to a junction where he joins a road that goes North West and drives a further 2 km. Find his displacement from home by then.

    asked on February 2, 2014
  97. Math quadratic equation

    2/x+5 - x/x-5 =1 I multiplied both side by (x+5) (x-5) or by x^2 -25 and I arrive at -x^3+x^2+25x-25 =0 And now I am stuck. Thanks for any help

    asked on November 10, 2018
  98. Chemistry

    How much heat is required to convert 9.00 g of water at 100°C into steam at 100°C, if ∆Hvap for water = 40.7 kJ/mol?

    asked on July 28, 2018
  99. Math

    A Texas oil drilling company has determined that it costs $25,000 to sink a test well. If oil is hit, the revenue for the company will be $500,000. If natural gas is found, the revenue will be $150,000. If the probability of hitting oil is 3% and of

    asked on August 2, 2017
  100. Trigonometry

    A telephone pole 40 feet high is situated on an 13° (H) slope from the horizontal. The measure of angle CAB is 21°. Find the length of the guy wire AC.

    asked on November 8, 2014


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