Most popular questions and responses by Andy
  1. Calculus

    The curve y = x/(1 + x^2) is called a serpentine. Find an equation of the tangent line to this curve at the point(2, 0.40).(Round the slope and y-intercept to two decimal places.)

    asked on November 2, 2011
  2. trig

    A population of wolves in a country is represented by the equation p(t)=80(0.98)^t, where t is the number of years since 1998. Predict the number of wolves in the population in the year 2008.

    asked on January 31, 2010
  3. Pre calc

    sin(θ + ϕ); sin(θ) = 5/13 θ in Quadrant I, cos(ϕ) = − 2root 5 over 5 ϕ in Quadrant II please give final answer this is bc i have a lot of trouble simplifying the final answer thank you

    asked on April 11, 2017
  4. Calc

    Air pressure at sea level is 30 inches of mercury. At an altitude of h feet above the, air pressure, P, in inches of mercury, is given by, P =30e^(-3.23x10-5h) a)Find th equation of the tangent line at h=0. b)A rule of thumb is given by travelers is that

    asked on October 23, 2012
  5. Corporate Finance

    1. Langston Labs has an overall (composite) WACC of 10%, which reflects the cost of capital for its average asset. Its assets vary widely in risk, and Langston evaluates low-risk projects with a WACC of 8%, average projects at 10%, and high-risk projects

    asked on March 1, 2010
  6. Chemistry

    Please help the question that I got is: Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at 78 degree Celsius. Knowing that solubility of sulfanilamide is 210 mg/ml at 78 degree Celsius, 14mg/ml at 0 Degree Celsius.

    asked on September 21, 2010
  7. gr.11 physics help!

    When an iceberg floats in the ocean, what fraction of it is visible?( The relative density of ice is 0.92, and the relative density of sea water is 1.03)

    asked on January 6, 2010
  8. chemistry

    For the equilibrium H2(g)+CO2(g)H2O(g)+CO(g) Kc=3.18 at 1106 K.If each of the four species was initially present at a concentration of 3.000M,Calculate the equilibrium concentration of the CO (g) at this temperature. Choices 0.844 3.268 3.844 3.460 2.156

    asked on May 9, 2010
  9. Corporate Finance

    19. Fool Proof Software is considering a new project whose data are shown below. The equipment that would be used has a 3-year tax life, and the MACRS rates for such property are 33%, 45%, 15%, and 7% for Years 1 through 4. Revenues and other operating

    asked on March 1, 2010
  10. Maths Lit, Accounting, Economics, Business Studies

    I am a grade 10 learner doing Maths Literacy, Accounting, Business Studies, Economics, Life Orientation, English and Afrikaans I want to know what Degree I can study in University and also to check what career path I would be able to do.

    asked on August 5, 2015
  11. Math

    a gasoline pump delivers 4 2/5 gallons of gas per minute. How many minutes will it take to fill a gas tank that holds 16 1/2 gallons?

    asked on December 11, 2008
  12. physics

    A car weighing 1.0 x 10^4N is parked on a 34 degree slope. The brakes fail and the car starts to slide down the hill. Assume no friction. Show your work, and determine a) the acceleration of the car, and b) after it has moved 28.0 m, how fast is it moving?

    asked on November 2, 2014
  13. hysical edu

    Roger is a single father of two young daughters and has been dating Cheryl for the past two years. He recently learned that his company is going to downsize. Although Roger is financially stable, he is worried that his job is in jeopardy. He hasn't told

    asked on June 18, 2012
  14. pre calc

    tan(θ + ϕ); cos(θ) = − 1/3 θ in Quadrant III, sin(ϕ) = 1/4 ϕ in Quadrant II I am really struggling with this idk why I keep getting the wrong answers

    asked on April 11, 2017
  15. Chemistry

    15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.23M lead(II) nitrate solution. What mass of precipitate will form?

    asked on September 28, 2014
  16. trig

    Let (theta) be an angle in quadrant II such that csc(theta)=8/5 Find the exact value of tan(theta) and cos(theta).

    asked on May 10, 2011
  17. chem can u check answer please

    what is the hydrogen ion concentration of an aqueous solution with a pOH of 9.262? I got 5.47X 10 ^-10 is this correct? Thanks Andy

    asked on May 23, 2010
  18. science

    I need an acrostic poem about forces

    asked on December 7, 2015
  19. LA

    Rewrite using a possessive noun: the (separate) bikes of Keith and Frank, the brooms of the witches, and the dog of Mike and Erin

    asked on January 11, 2017
  20. math

    One cubic meter (1.00 m3) of aluminum has a mass of 2.70E+3kg, and 1.00m3 of silver has a mass of 1.05E+4kg. Find the radius of an aluminum sphere whose mass is the same as that of an silver sphere of radius 1.07cm.

    asked on September 7, 2014
  21. chemistry

    What type of chemical rxn is Na2SO4(aq) +Ba(NO3)2(aq) the product is BaSO4(s) + 2NaNO3(aq)?what is its net ionic equation?

    asked on September 3, 2014
  22. chem--need help, please!!!

    Ka for benzoic acid, C6H5COOH, 6.5x10^-5. Calculate the pH of solution after addition of 10.0, 20.0, 30.0, and 40.0 mL of 0.10 M NaOH to 40.0 mL of 0.10 M Benzoic acid. PLEASE CHECK MY ANSWER!!!!! My answer is: Moles acid = 0.040 L x 0.10 M = 0.0040 Moles

    asked on October 20, 2010
  23. Physics

    Consider the 56 N weight held by two cables shown below. The left hand cable is horizontal. What is the tension in the cable slanted at an angle of 38degrees

    asked on November 6, 2012
  24. chemistry

    The solubility product constant (Ksp) for the dissolution of PbSO4 as represented by the chemical equation is 1.7x10-8. PbSO4 (s)= Pb2+ (aq) + SO42- (aq) Calculate the mass (g) of PbSO4 that dissolves in 1100 mL of water.

    asked on May 13, 2010
  25. Finance

    You want to be able to withdraw $25,000 from your account each year for 20 years after you retire. If you expect to retire in 25 years and your account earns 7% interest while saving for retirement and 6.7% interest while retired Round your answers to the

    asked on April 27, 2016
  26. la check

    which of the following is not a major point of view first person third person fourth person limited (THIS ONE)

    asked on February 24, 2015
  27. Math

    One advantage of a _____________ is that the actual data values are retained in the graphical display of the data. A) Pie chart B) Dot plot (This one?) C) Histogram D) boxplot If we want to discuss any gaps and clusters in a data set, which of the

    asked on September 5, 2013
  28. physics

    Spaceship I, which contains students taking a physics exam, approaches Earth with a speed of 0.640 c, while spaceship II, which contains instructors proctoring the exam, moves away from Earth at 0.280 c, as in Figure P26.27. If the instructors in spaceship

    asked on April 16, 2010
  29. math

    Nolan practices the piano for 1 2/5 hours every Saturday and Sunday. How long does he practice each weekend? Express your answer in hours and minutes.

    asked on March 17, 2015
  30. Pre calc

    sin(θ − ϕ); tan(θ) = 5/12 , θ in Quadrant III, sin(ϕ) = − square root 10 over 10 ϕ in Quadrant IV Please help last one

    asked on April 11, 2017
  31. physics

    Along a straight road through town, there are three speed-limit signs. They occur in the following order: 56 , 33 , and 24 mi/h, with the 33 -mi/h sign located midway between the other two. Obeying these speed limits, the smallest possible time tA that a

    asked on September 8, 2012
  32. physics

    A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +1.2. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror?

    asked on November 6, 2014
  33. Physics

    elbow raises a 1200 N piano a distance of 5 meters using a set of pulleys. elbow pulls in 20.0 meter of rope while exerting a force of 340 N. a) what is the work output? b) what is work input c) what is the mechanical advantage of this machine? d) what is

    asked on November 3, 2013
  34. Math - Data Management

    I'm kinda stuck on my math homework, does anyone know how to do it? The results of a blood test at a medical lab are normally distributed with a mean of 60 and a standard deviation of 15. How low must a score be to lie in the lowest 5% of the results?

    asked on June 9, 2011
  35. Computer Science

    w w w (dot)cs(dot)umass(dot)edu(slash)~verts(slash)coins105(slash)quizzes(slash)images(slash)hw10(dot)gif Using the constants in cells A2:A9, create formulae for cells A12:A15 (surrounded by a dark line) to compute the corresponding "derived" physical

    asked on April 4, 2010
  36. physics

    A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third second?

    asked on November 14, 2012
  37. Chemistry

    3Cu+8HNO3--> 3Cu(NO3)2+ 2NO+4H2O How many moles of HNO3 are required to react with 6 moles of Cu? How many moles of Cu(NO3)2 are produced when 3 moles of Cu react? How many moles of Cu must react to produce 4 moles of NO? If 4 moles of NO are produced, how

    asked on July 24, 2008
  38. chemistry

    What volume of a 0.550 M solution of potassium hydroxide can be made with 18.3 g of potassium hydroxide? (Ignore significant figures for this problem.)

    asked on September 28, 2014
  39. Physics

    The mass of Venus is 0.8140 times that of earth, and its radius is 0.950 times that of earth. Calculate the acceleration of gravity at the surface of Venus. Express your answer in g's (i.e. as a ratio to our acceleration of gravity). 9.01×10-1 is the

    asked on October 11, 2009
  40. books "A Thankless Experience" Short Essay Help

    This is the story: A Thankless Experience by Stephen Lautens. The story is on the internet. jiskha does not allow me to post the url The question is: Provide two examples of figurative language used by Lautens in his essay and describe the effect of each

    asked on September 25, 2013
  41. Chemistry

    Experiment Na2C2O4 is added to Pb(NO3)2.Precipitate forms (I think its PbC2O4). After the liquid above was decanted to another container. Dilute HNO3(aq) was added to it. The decanted cloudy solution cleared up a little but it was kinda cloudy still. Im

    asked on April 1, 2012
  42. Physics

    At serve, a tennis player aims to hit the ball horizontally. What minimum speed is required for the ball to clear the 0.91 m high net about L = 15.1 m from the server if the ball is "launched" from a height of H = 2.55 m? How far from the end of the

    asked on February 5, 2012
  43. Geomentry

    prove the statement Angle ABD is a right angle and Angle CBE is a Right Angle and prove Angle ABC is Congruent to Angle DBE

    asked on October 27, 2013
  44. Chemistry

    2.) Part A.2. Suppose 6 M HCl is substituted for the 3 M HCl in the procedure. What would be the consequence of this substitution?

    asked on November 2, 2011
  45. statistic

    Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Persson, Bringlov, Nilsson, and Nyberg, 2004).

    asked on June 24, 2017
  46. Algebra

    Find the Range of each function for the given domain. f(x)= -4x+3;{-1,0,1,2,3}

    asked on July 18, 2019
  47. physics

    The average lifetime of muons at rest is 2.20 us. A laboratory measurement on muons traveling in a beam emerging from a particle accelerator yields an average muon lifetime of 19.668 us. What is the speed of the muons in the laboratory?

    asked on April 15, 2010
  48. Physics

    A block of mass 5kg is lifted 2m in 3sec. Find the work done.

    asked on April 22, 2011
  49. Math

    Lisa and Katie are playing a card game, and a total of 900 points has been scored. Lisa scored 400 more points than Katie. If you let l= l= the number of points that Lisa scored, and k= k= the number of points that Katie scored, then the problem can be

    asked on May 30, 2016
  50. phsyics

    The x and y components of a certain force are measured and found to be Fx = (68 ± 3)N and Fy =(42 ± 2) N, respectively. Calculate the magnitude of this force? expressing your result to the proper number of significant figures.

    asked on September 25, 2016
  51. Chemistry

    A mixture of NaCN and NaHSO4 consists of a total of 0.60 mol. When the mixture is dissolved in 1.0 L of water and comes to equilibrium the pH is found to be 9.7.

    asked on March 9, 2014
  52. Physics

    A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.95 s after leaving the dock has a magnitude of 6.7 m. What is the car's speed at the instant it drives off the edge of the dock?

    asked on February 9, 2013
  53. A Thankless Experience

    I really need help on this question it is worth 5 marks. The question is: Explain how "A Thankless Experience" is a satire with support with direct reference to the essay. The short essay is called A Thankless Experience by Stephen Lautens' Thank you :)

    asked on September 28, 2013
  54. Physics

    Two particles, of mass m and mass nm, undergo a head-on, fully elastic collision. (Here n is just a unitless number.) Before colliding the particles approach one another with equal speed v. Snapshots of the particles before, during, and after the collision

    asked on November 3, 2015
  55. Physical Edu

    The transformation of love progresses in the following way: a. high levels of passion, increasing intimacy, diminished romance, enduring love. b. high levels of passion, increasing intimacy, diminished romance, breakup of relationship c. sex, passion,

    asked on June 18, 2012

    Bromine exists as a mix of bromine 79 and bromine 81 isotopes. an atom of bromine 79 contains: 35 prot.44.neutr.35 electrons 35 prot.and 35 electrons only 44 prot.44 elect and 35 neutr. 35 prot.79 neutr. and 35 electrons 79 protons 79 electrons and 35

    asked on May 12, 2010
  57. tax

    April and Joey are both 74 years old and received $1,500 in nontaxable social security benefits. Their AGI for the year was $18,000. How much can April and Joey claim as a credit for the elderly or the disabled? A. $300 B. $1,125 C. $1,500 D. $2,000 is it

    asked on April 2, 2012
  58. Tax

    Kobe is a single dad with two dependent children, Lizzie, age 7 and Leslie, age 3. He has AGI of $51,000 and paid $6,300 to a qualified day care center. What amount of credit can Kobe receive for the child and dependent care credit? A. $600 B. $1,200 C.

    asked on April 2, 2012

    Which of the following is NOT a postulate of the kinetic molecular theory? A; the average kinetic energy of the particles is directly proportional to the absolute temp. B;the forces of attraction and repulsion between the particles are insignificant C:the

    asked on May 10, 2010
  60. physics

    A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time a. what is the correct

    asked on September 11, 2009
  61. tax

    Caroline, who files as head of household, received $9,000 of social security benefits. Her AGI before the social security benefits was $27,000. She also received $200 of tax- exempt interest. What is the amount of taxable social security benefits? $9,000

    asked on May 10, 2012
  62. Chemistry

    Why can't benzene dissolve sodium chloride?

    asked on May 18, 2010
  63. physcial Edu

    All of the following are recommended by your text as time-management strategies, EXCEPT a. setting priorities. b. breaking down long-term goals into short-term ones. c. avoiding unstructured time. d. keeping track of tasks you put off. is it C

    asked on June 18, 2012
  64. Microeconomics

    3. An industry currently has 100 firms, all of which have fixed costs of $16 and average variable cost as follows: Quantity Average Variable Cost 1 $1 2 2 3 3 4 4 5 5 6 6 1) The price is currently $10. What is the total quantity supplied in this market? 10

    asked on April 28, 2012
  65. trig

    In a diagram of circle, chords AB and CD intersect at E. If AE = 3, EB = 4, CE = x, and ED = x - 4, what is the value of x?

    asked on February 1, 2010
  66. Algebra

    Find all of the points of the form (x, −1) which are 4 units from the point (3,2)

    asked on August 22, 2017
  67. Physics

    A motorcyclist traveling 35.0 m/s realizes suddenly that he is headed straight for the edge of the Grand Canyon 50.0 m away. He immediately begins to brake, decreasing his speed at a rate of 7.00 m/s^2. With what velocity will he fly off into the canyon?

    asked on September 23, 2014
  68. Chemistry

    What is the lattice energy of NaI? Use the given information below. Heat of formation for NaI = -288.0 kJ/mol Heat of sublimation for Na = 107.3 kJ/mol Ionization energy for Na = 496.0 kJ/mol Bond dissociation energy for I2 = 149 kJ/mol Electron affinity

    asked on November 22, 2013
  69. tax

    In 2011, the Chens' pleasure boat was severely damaged by a hurricane in an area that was declared a federal disaster area. They had AGI of $110,000 in 2011. The following information relates to the craft: cost basis $95000 FMV before casualty $145000 FMV

    asked on March 7, 2012
  70. math

    A store orders boxes of a new brand of cereal from their supplier. The suppier gives the store an additional 3% of the number of boxes ordered as free samples for customers. The store receives 1648 boxes in all. How many boxes of cereal did the store

    asked on September 11, 2019
  71. income tax

    Sean and Jenny are married, file a joint return and have two dependent children, Blake, age 9 and Jake, age 5. Sean has earned income of $72,000. Jenny was a full-time student (for nine months) with no income. They paid a qualified day care center $7,000.

    asked on May 10, 2012
  72. Physics

    A tennis player strikes a ball when it is 1 m above the ground, with a velocity 17 m/s at 30 degrees above the horizontal. The net is 4 m away horizontally and it is 0.6 m high. How high, vertically, above the net does the ball pass?

    asked on January 24, 2016
  73. physics

    Geostationary satellites are placed on orbits of radius 4.2×10^4m use this information to deduce g, the acceleration of freely falling body, at this height.

    asked on December 23, 2016
  74. Chemistry

    How many liters of excess reactant would be left when 3.00 liters of nitrogen monoxide is mixed with 2.00 liters of oxygen and allowed to react at 695 torr and 27 degrees Celsius to produce nitrogen dioxide

    asked on July 26, 2011
  75. physics

    Spaceship I, which contains students taking a physics exam, approaches Earth with a speed of 0.640 c, while spaceship II, which contains instructors proctoring the exam, moves away from Earth at 0.280 c, as in Figure P26.27. If the instructors in spaceship

    asked on April 16, 2010
  76. math 5th grade

    What are the multiplication combinations for 180?

    asked on September 5, 2011
  77. Chemistry

    Dr Bob Can you please confirm for me that only NH3 has a boiling point that does not fit the general trend from these choices NH3 PH3 SbH3 AsH3 many thanks andy I am picking NH3 because of the reason that the larger the compound the greater the boiling

    asked on May 11, 2010
  78. Math

    If A represents the number of apples purchased at 15 cents each, and B represents the number of bananas purchased at 10 cents each, which of the following represents the total value of the purchases in cents? a) A+B b) 25(A+B) c)10A+15B d) 15A+10B

    asked on November 30, 2012
  79. Algebra

    A kayak moves at a rate of 10 mph in still water. If the river's current flows at a rate of 2 mph, how long does it take the boat to travel 24 miles upstream?

    asked on February 6, 2012
  80. Chemistry (Acids and Bases)

    THIS HAS TWO PARTS NaOH(s) was added to 1.0 L of HCl(aq) 0.42 M. 1) Calculate [H3O+] in the solution after the addition of 0.13 mol of NaOH(s). 2) Calculate [H3O+] in the solution after the addition of 0.81 mol of NaOH(s).

    asked on March 20, 2011
  81. Corporate Finance

    1. TexMex Products is considering a new salsa whose data are shown below. The equipment that would be used would be depreciated by the straight-line method over its 3-year life, would have zero salvage value, and no new working capital would be required.

    asked on March 1, 2010
  82. physical Edu

    Which is a common expectation that can hurt a relationship? a. expecting your partner to change b. expecting that your partner loves you c. expecting intimacy d. expecting that you can trust your partner is it A

    asked on June 18, 2012

    although helium atoms do not combine to form He2 molecules is it fair to say that London dispersion forces (induced dipole forces)are what attract He atoms weakly to one another? The other choices are dipole-induced dipole forces Hydrogen bonding

    asked on May 11, 2010
  84. Math

    An Egyptian Mummy stands upright in a case that is 3.5m high, and has a colume of 14m^3. The width of the case is half the length. What are the length and width of the case? Please leave an explanation Thanks!~~~

    asked on January 11, 2009
  85. Statistics

    The lifetime of computer chips is approximately normal with mean 1.4×106 hours and standard deviation 3×105 hours. The statistics department has 5 computers built with that chip as the main component. What is the probability that all 5 computers last

    asked on April 12, 2013
  86. CHEMISTRY!!/science

    A mixture of CO2 and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times longer than the unknown gas to escape.Which of the following gases could the unknown one be Choices A: Cl2 B: CO C: HCl D: H2 E: SO2 I am going B

    asked on May 10, 2010
  87. physics

    A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness is negligible. what is the inductance per

    asked on February 21, 2010
  88. Chemistry

    What would be a good chemical blank to use for the Tollen's Test (Silver Mirror test)?

    asked on March 7, 2017
  89. physics

    At ground level g is 9.8meter per second square. Suppose the earth started to increase its angular velocity. How long would a day be when the people on the equator were just 'thrown off' why is the expression thrown off is a bad one?

    asked on December 20, 2016
  90. chemistry

    Can you please check if I came up with the right answer for this please. A 4.30L container had 55.10 moles of N2O4 added to it. When equilibrium was established the concentration of N2O4 was found to be 1.69M.What is the Kc for the following reaction?

    asked on May 10, 2010
  91. Collage Physic

    A uniform rod hangs vertically on a frictionless horizontal axle passing through its center. The rod is 35cm long and 85g. A 15g ball of clay travelling horizontally at 2.5cm/!@#$%^&s and sticks to the bottom of the rod. What is the maximum angle the rod

    asked on March 28, 2016
  92. books (A thankless experience)

    Explain whether Lautens' essay is written formally or informally, referring to examples from the essay for support. The short essay is on the internet called A thankless experience by Stephen Lautens. I can not post the url because jiskha does not allow

    asked on September 24, 2013
  93. chem can u check answer please

    the solubility of silver sulfate in water is 0.223%(w/v) at 35 degrees celsius.calculate the solubility product of this salt at this temp. I got 1.46 X 10^-6 M is this right please thanks Andy

    asked on May 23, 2010
  94. chemistry

    for the equilibrium H2+CO2H2O+CO Kc=3.18 at 1106K. if each of the four species was initially present at 3.000M calculate the equilibrium concentration of the CO at this temperature..... OK I can get as far as equilibrium (final) H2O=3.000-x CO=3.000-xx

    asked on May 9, 2010
  95. world history

    Explain the origins of Hinduism and Buddhism and compare their main beliefs and social practices associated with them?

    asked on September 11, 2007
  96. Algerbra

    The expression x*y has the value y^-2 -(-SQRT(x))^3. find the value of 49* -1/3

    asked on November 14, 2018
  97. science /chem

    1250.37986 rounded to four significant figures is ??????

    asked on May 12, 2010
  98. English

    clive looked up at a dictionary page with the guide words - MOB and MOP write a list of words that might be found on the page pleasehelp

    asked on August 27, 2019
  99. Physics

    Could someone help explain this problem to me . . . Carbon 14 has a half-life of 5700 year, scientist use this fact to determine the age of things made of organic material. Suppose the average page of a book containing aprox. 0.5mg of Carbon 14 is put into

    asked on December 9, 2007
  100. world history

    What important contributions did the Aryans make to ancient India

    asked on September 11, 2007


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