Popular questions and responses by lynn
  1. Math

    In a volleyball a player on one team spikes the ball over the net when the ball is 10 ft above court. The spike drives the ball downward with initial vertical velocity of -55 feet per second. Players on the opposing team must hit the ball back over the net

    asked on November 18, 2011
  2. Math (Please help ASAP!!)

    24. You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is -0.015. How confident can you be that your predicted value will be reasonably close to the actual value? My

    asked on April 16, 2018
  3. Chemistry

    Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)-->2NH3(g) Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present. After complete reaction, how many molecules of ammonia are

    asked on October 7, 2012
  4. English

    All these sentences look right to me. Which is incorrect? Identify the incorrect sentence. A. The jury has been deliberating for the past three hours. B. Members of the jury have been deliberating for the past three hours. C. The jury is arguing over the

    asked on July 23, 2015
  5. Chemistry

    What is the Pb2+ concentration in a saturated solution of PbCl2 if the concentration of chloride ion is 0.023 M? Units: M ksp = 1.72x10^-5 i can't seem to get the answer. i have tried and ICE diagram and going from there: PbCl2 (s) Pb ^2+ = 2Cl- I: 0.023 M

    asked on April 3, 2017
  6. US Government

    Can someone please help confirm my answers? 1. Which of the following is TRUE regarding the Supreme Court’s modern rulings on regulation of interstate commerce? a. The Court allows federal regulation of almost anything related to interstate commerce. b.

    asked on June 14, 2018
  7. Stats

    What is the minimal sample size needed for a 99% confidence interval to have a maximal margin of error of 0.06 if there is no preliminary estimate for p?

    asked on July 8, 2012
  8. chemistry

    How many moles of molecules are in 252 g of hydrogen nitrate (HNO3)? Answer in units of mol

    asked on November 5, 2011
  9. Physics

    In Larry Niven’s science fiction novel Ringworld, a ring of material of radius 1.54 × 1011 m rotates about a star with a rotational speed of 1.5 × 106 m/s. The inhabitants of this ring world experience a normal contact force ~n. Acting alone, this

    asked on July 9, 2013
  10. Math

    Jenny's lawn is 1/3 of an acre. After moving 1/2 of the lawn, how much of an acre has she mowed? A. 1/5 B. 1/6 C. 1/2 D. 2/5 ______________________________ A leaking bucket is filled to 3/4 capacity. After some time, 1/2 of the water has leaked out. What

    asked on December 31, 2016
  11. US government

    Which of the following organized interests was NOT part of the original process of bargaining during the 1920s through the 1950s? I think it's E. Is this right please? A. business B. labor C. professional groups D. environmentalists E. farming

    asked on February 15, 2019
  12. Statistics HELP!

    Use a normal approximation to find the probability of the indicated number of voters. In this case assume that 119 eligible voters aged 18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged 18-24, 22% of them voted.

    asked on May 18, 2015
  13. Physics

    Two 1.5 kg balls move away from each other, one traveling 6 m/s to the right, the other 2 m/s to the left. What is the magnitude of the total momentum of the system? Answer in units of kg · m/s

    asked on July 14, 2013
  14. geometry

    A lacrosse field measures 110 yards long by 60 yards wide. What would be an appropriate scale to construct a scale drawing of a lacrosse field so it would best fit on a 8.5 by 11 inch sheet of paper?(1 yd = 36 in.)

    asked on February 2, 2012
  15. Calculus

    "Three hundred books sell for $40 each, resulting in a revenue of $12,000. For each $5 increase in price, 25 fewer books are sold. Write revenue R as a function of the number x of $5 increases." How would you get this problem started?

    asked on September 8, 2014
  16. Calc BC

    Let f be the function defined by f(x)=(4x-8)/(x^2+5x-14) write an equation of the lien normal to the graph of f at x=1 how?

    asked on May 3, 2013
  17. geometry

    if ON=7x-5, LM= 6x+3, NM =x-4, and OL =2y+5, find the value of x and y given that LMNO is a parallelogram

    asked on May 15, 2012
  18. physics

    A cheerleader lifts his 62.2 kg partner straight up off the ground a distance of 0.89 m before releasing her. The acceleration of gravity is 9.8 m/s 2 . If he does this 19 times, how much work has he done? Answer in units of J

    asked on September 27, 2012
  19. US government

    Which of the following is NOT considered illegal discrimination? I think this is D. Can you please confirm? A. Setting different ages at which men and women legally become adults. B. Barring women from jobs by arbitrary height and weight requirements.b. C.

    asked on February 15, 2019
  20. Chemistry

    Balance the following half-reactions: (a) (acidic) VO2+ (aq) -------V3+ (aq) (b) (basic Ni(OH)2 (s)--------Ni2O3 (s) (c) (acidic) NO3- (aq)-------NO2 (aq) (d) (basic) Br2 (aq)----------BrO3- (aq)

    asked on October 28, 2012
  21. business law

    You make an online purchase of a hooded sweatshirt with the logo of the Dallas Cowboys. The next time you log on, your screen has a banner ad for Dallas Cowboy hats and shirts. This banner ad is most likely the result of: A) a cookie. B) a coincidence. C)

    asked on March 1, 2014
  22. Chemistry

    Calculate the concentrations of all species in a 0.390 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Species: Na+ SO3 2- HSO3 - H2SO3 OH- H+ Thanks! The only thing I seem to

    asked on April 5, 2014
  23. Maths

    A ball is dropped from a height of 80ft.The elasticity of this ball is such that it rebounds three-fourths of the distance it has fallen. How high does the ball rebound on the fifth bounce? Find a formula for the height the ball rebounds on the nth bounce?

    asked on July 7, 2015
  24. Physics

    A book weighing 12 N is placed on a table. How much support force does a table exert on the book? Answer in units of N

    asked on July 1, 2013
  25. chemistry

    NH4NO3(s) + H2O(l) NH4NO3(aq) ΔH = +25.7 kJ What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial temperature of 25.0°C,

    asked on July 15, 2012
  26. 6th grade line segment

    How to you do a problem like this? A segment that is 1/2 of an inch long is how many sixteenths of an inch long? Thanks

    asked on October 10, 2010
  27. Math

    A wildlife biologist in Nova Scotia is testing the pH of stream water. She hopes that the pH of the water is greater than 5.5 so that Atlantic Salmon returning this year to their natal streams will be able to reproduce. The hydrogen ion concentration of

    asked on July 24, 2008
  28. HELP!! Statistics!

    The accompanying data table lists measured voltage amounts supplied directly to a family’s home. The power supply company states that it has a target power supply of 120 volts. Using these home voltage amounts, test the claim that the mean is 120 volts.

    asked on June 3, 2015
  29. Chemistry

    Lithium hydroxide is used in the space program to remove carbon dioxide (from respiration) in spacecraft. Specifically, lithium hydroxide, LiOH, reacts with carbon dioxide, CO2, to form lithium carbonate, Li2CO3, and water. 2 LiOH + CO2 ® Li2CO3 + H2O

    asked on July 24, 2008
  30. economics

    Think about how each scenario would affect the price of khaki pants. a.A new technology reduces the time it takes to make a pair of khaki pants. b.The price of the cloth used to make khaki pants falls. c.The wage rate paid to garment workers increases.

    asked on October 18, 2015
  31. chemistry

    Zinc chloride (ZnCl2) is 52.02% chlorine by mass. What mass of chlorine is contained in 53.6 g of ZnCl2? Answer in units of g

    asked on November 6, 2011
  32. chemistry

    Duralin is an alloy of aluminium containing 4.5% manganese, 3.5% copper, and 0.45% magnesium. How much magnesium is present in a 90 g sample of this alloy? Answer in units of mol

    asked on November 6, 2011
  33. physics

    This question is typical on some driver’s license exams: A car moving at 40 km/h skids 12 m with locked brakes. How far will the car skid with locked brakes at 80 km/h? Answer in units of m

    asked on September 27, 2012
  34. business

    Molly Ellen, bookkeeper for Keystone Company, forgot to send in the payroll taxes due on April 15. She sent the payment November 8. The IRS sent her a penalty charge of 8% simple interest on the unpaid taxes of $4,100.

    asked on May 6, 2012
  35. Physics

    Three point charges are on the x axis: −9 μC at −3 m, 2 μC at the origin, and −5 μC at 3m. Find the force on the first charge. The value of the Coulomb constant is 8.98755 × 109 N · m2/C2. Answer in units of N.

    asked on February 2, 2018
  36. Chemistry

    Which of the following substances are likely to be soluble in water? A)ZnS b)Au2(CO3)3 C )PbCL2 d) MnO2

    asked on October 23, 2012
  37. trig

    Find the bearing and airspeed for a plane to fly 630 miles due north in 3 hours if the wind is blowing from a direction of 318* and is blowing at 15mph. Approximate the bearing to the nearest degree and the speed to the nearest mile per hour.

    asked on April 28, 2015
  38. Chemistry

    Balance the following half-reactions: (a) (acidic) VO2+ (aq) -------V3+ (aq) (b) (basic Ni(OH)2 (s)--------Ni2O3 (s) (c) (acidic) NO3- (aq)-------NO2 (aq) (d) (basic) Br2 (aq)----------BrO3- (aq)

    asked on October 28, 2012
  39. Chemistry

    Calculate the mass of water produced when 3.94 g of butane reacts with excess oxygen. Butane, C4H10, reacts with oxygen, O2, to form water, H2O, and carbon dioxide, CO2, as shown in the following chemical equation: 2C4H10(g)+13O2(g)→10H2O(g)+8CO2(g)

    asked on May 6, 2019
  40. statistics

    asked on June 2, 2013
  41. Math

    Find the value of x. The area of a rectangle = 105 The length is 2x+1 Width is x __________________________________ I tried solving it : Arec = l x w 105 = (2x+1)x 105 = 2x^2 + x 0= 2x^2 + x - 105 This is where I get stuck on...

    asked on November 4, 2011
  42. chemistry

    Give the orbital designations of electrons with the following quantum numbers" (a) n = 3, l = 0, m1=0 (b) n=2, l=1, ml=-1 (c) n=4, l=3, ml=-2 (d) n=4, l=2, ml=0

    asked on November 11, 2012
  43. Financial math

    Janet Woo decided to retire to Florida in 5 years. What amount should Janet invest today so she can withdraw $45,000 at the end of each year for 20 years after she retires? Assume Janet can invest money at 5% compounded annually.

    asked on June 29, 2016
  44. physics

    A 2.8-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of the spring/mass system is 1.2 J. What is the elastic potential energy of the system when the 2.8-kg block is replaced by

    asked on January 26, 2010
  45. Chemistry

    Charcoal is primarily carbon. Determine the mass of CO_2 produced by burning enough carbon (in the form of charcoal) to produce 510 kJ of heat. C + O2 --> CO2 Delta H = -393.5 kJ

    asked on March 19, 2012
  46. algebra

    Solve. 10/(3x) + 4/3 = (7 + x)/2x A) x = 1/3 B) x = 17/5x C) x = 1/5 D) x = 1/6 PLEASE HELP MRS. SUE!

    asked on April 22, 2013
  47. algebra

    The cost of operating an appliance varies jointly as the number of watts, hours of operation, and the cost per kilowatt-hours. It costs $0.45 to operate a 3000-watt air conditioner for 2 hours at a cost of $0.075 per kilowatt-hour. Find the Cost of

    asked on July 29, 2017
  48. chemistry

    a solution contains Cr3+ ion and Mg2+ ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.8 g.

    asked on January 28, 2012
  49. Physics

    A projectile is fired with a velocity u at right angles to the slope, which is inclined at an angle theta with the horizontal. Derive and expression for the distance R to the point of impact. The only think I know to do in this situation is to make the

    asked on October 4, 2009
  50. physics

    A 170 kg physics professor has fallen into the Grand Canyon. Luckily, he managed to grab a branch and is now hanging 53 m below the rim. A student (majoring in linguistics and physics) decides to perform a rescue/experiment using a nearby horse. After

    asked on October 26, 2011
  51. chemistry

    When the equation Fe2(SO4)3(aq) + 3Ba(OH)2(aq) ! is completed and balanced, a term in the balanced equation is 1. 2 Fe(OH)(s). 2. 2 Fe2(SO4)3(aq). 3. Ba2(SO4)3(aq). 4. 2 Fe(OH)3(s).

    asked on November 6, 2011
  52. math

    Write the decimal as a percent: 0.3 4. Write the decimal as a percent: 5.16 5. Write the percent as a decimal: 61% 6. Order from least to greatest: 68%, one half , 0.55, 1.28 7. Write the fraction as a percent. If necessary, round to the nearest tenth of a

    asked on January 8, 2019
  53. chemistry

    How much aluminum nitrate can be found when 12 g of aluminum react with lead(II) nitrate? Answer in units of mol

    asked on January 22, 2012
  54. math

    350 is 70% of what number? A) 500 B) 420 C) 245 D) 280 What percent of 64 is 24? A) 267% B) 62.5% C) 40% D) 37.5% What percent of $6.50 is $2.60? A) 25% B) 40% C) 90% D) 250% 20% of 140 is what number? A) 280 B) 120 C) 28 D) 12 HELP

    asked on December 17, 2018
  55. US government

    Elections based on a plurality system discourage new parties from forming because I think it's C. Is this correct please? a. a plurality system discourages patronage and reduces voter interest in joining a party b. a plurality system requires parties to

    asked on February 15, 2019
  56. Statistics

    If np ≥ 5 and nq ≥ 5, estimate P (fewer than 4) with n = 13 and p = 0.5 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq

    asked on May 17, 2015
  57. Chem

    A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate (with the fillers

    asked on March 8, 2017
  58. chemistry

    Which of the following solutions will not form a precipitate when added to 0.10M NaOH? a) 0.10 M MgBr2 b) 0.10 M NH4Br c) 0.10 M FeCL2

    asked on October 23, 2012
  59. Physics

    A neutral ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. Why is this? 1. The ball becomes negatively charged by induction. 2. The string is not a perfect conductor.

    asked on July 23, 2013
  60. Physics

    A street lamp weighs 158 N. It is supported equally by two wires that form an angle of 107˚ with each other. What is the tension of each of these wires?

    asked on July 2, 2013
  61. Geography

    The thickness of the troposphere varies from place to place and from day to day. What influences this thickness? Please give me some ideas!!!THANKS!!!

    asked on June 9, 2010
  62. Chemistry

    A sample of Helium occupies 200 L at 30ºC under a pressure of 970 torr. What is the volume it occupies at standard temprature and pressure (STP)?

    asked on April 18, 2010
  63. math

    I need to solve as an equation. A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of been should be used

    asked on August 8, 2007
  64. Trig

    verify the following identity: tanx+cotx/cscx=secx

    asked on July 19, 2012
  65. Chem

    How many lone pairs of electrons are on the central atom in the water molecule

    asked on April 8, 2010

    In a test of of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured beforeandafter the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 5.4

    asked on May 26, 2015
  67. Trig

    verify the following identity: 2sinxcos^3x+2sin^3cosx=sin(2x)

    asked on July 19, 2012
  68. statistics

    A USU Today survey found that of the gun owners surveyed 55% favor stricter gun laws. The survey Involved 500 gun owners. Test the claim that a majority (more than 50%) of gun owners favor stricter gun laws. Use a .05 significance level.

    asked on May 12, 2010
  69. US government

    97. Public opinion supports _______ the role of the federal government. I think it's E. Can you please confirm? a. localizing b. centralizing c. expanding d. outsourcing e. decreasing

    asked on February 15, 2019
  70. Algebra

    A line has slope -5/3. Through which two points could this line pass? A: (12,13), (17,10) B: (16,15), (13,10)*** C: (0,7), (3,10) D: (11,13), (8,18)*** My Explanation: I know how to use the formula for slope, which is y2 -y1 over x2 - y2, so I know how to

    asked on December 8, 2016
  71. Chemistry

    How many milliliters of 0.277 M AgNO3 solution are needed to react completely with 47.1 mL of 0.278 M NaCl solution? How many grams of AgCl will be formed? The reaction is NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

    asked on November 1, 2011
  72. poetry

    I need to know what format is being used in this poem: Canadian Angels Angels of the House, Angels of Mercy- yes, they've called women that. But these are Angels of Ice,Hard-muscled, sharp, dangerous as winter's cold. How else do you explain their speed,

    asked on October 5, 2013
  73. English

    I need a thesis statement on the positive impacts of Online Dating

    asked on September 29, 2019
  74. chemistry

    Which of the following solutions will not form a precipitate when added to 0.10M NaOH? a)0.10 M MgBr2 b) 0.10 M NH4Br c) 0.10 M FeCL2

    asked on October 23, 2012
  75. math

    The Jacobys went on a 600-mile trip. On the first day they drove 5 3/4 hours and on the second day they drove 4 3/4 hours. How many hours did they drive during the first two days?

    asked on March 6, 2016
  76. US History

    One notable difference between the passage of Medicare (1965) and the Patient Protection and Affordable Care Act (2010) was the lack of ______. A. bipartisan support for the 2010 Act B. bipartisan support for the 1965 Act C. media coverage given to the

    asked on December 12, 2018
  77. Biostatstics

    Question: The New York State Health Department reports a 10% rate of the HIV virus for the “at-risk” population. Under certain conditions, a preliminary screening test for the HIV virus is correct 95% of the time. (Subjects are not told that they are

    asked on September 18, 2016
  78. statistics

    A purchasing agent wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and find that the sample mean is 180 lbs with a sample standard deviation of 38.5 lbs. a)State the 90% confidence interval for the mean.b) State

    asked on June 13, 2012
  79. Math (Algebra)

    I sent my professor asked the pros and cons of each method, I answered with this; When graphing; pros are that graphing gives you a picture of what the solution is. Cons would be is that graphing is not always accurate and it is difficult to see the

    asked on June 23, 2010
  80. math

    the product of johns height and 5 is 95 use the variable j to represents john

    asked on August 28, 2019
  81. Chemistry

    Calculate (in calories) the amount of heat needed to melt 96g of ice at -24 degrees C to water at 28 degrees C.

    asked on January 15, 2014
  82. Math

    Start at 500 create a pattern that subtract 4 from each number stop when you have 5 numbers

    asked on February 26, 2018
  83. physics

    Potential energy and kinetic energy are forms of what kind of energy? 1. mechanical 2. nuclear 3. heat 4. electromagnetic 5. chemical

    asked on October 26, 2011
  84. Math - Word Problem

    Word problems confuse me >_> You are choosing between two long-distance telephone companies. Company A charges $.09 per minute plus $4 monthly fee. Company B charges $.11 per minute with no monthly fee. X = number of minutes you call long distance y =

    asked on October 12, 2011
  85. math

    Devon's bike has wheels that are 27 inches in diameter. After the front wheel picks up a tack, he rolls another 100 ft and stops. How far above the ground is the tack?

    asked on October 25, 2010
  86. com 220

    how do you know when sources ar reliable? explain your answer.

    asked on October 4, 2008
  87. math

    i need to find the measure of angle B to the nearest degree if tanB=3.4874

    asked on May 15, 2008
  88. chemistry

    Which atom in each of the following pairs has a larger radius? a) Na or K b) V or Zn c) V or Ta d) Li or Ba

    asked on November 11, 2012
  89. Algebra 2

    Condense the expressions 1) 10 log x + 2 log 10 2) 1og base 5 of 8 - log base 5 of 12 Can you please explain to me how do you condense these expressions? Thanks in advanced!

    asked on January 18, 2012
  90. Algerbra

    The range of the function y=3x-2 is 1, 7, 13, 16 , and 19. Which number is in the domain of the function ?

    asked on October 24, 2010
  91. physics

    A moving car has kinetic energy. If it speeds up until it is going four times faster than before, how much kinetic energy does it have in comparison? 1. The mass is needed. 2. The same 3. Sixteen times larger 4. Four times smaller 5. Four times larger 6.

    asked on October 26, 2011
  92. chemistry

    Glauber's salt undergoes a phase transition according to the following equation: Na2SO4*10H2O(s)--> Na2SO4*10H2O(l) ∆H = 74.4 kJ/mol Calculate the mass (g) of Glauber's salt (use the masses to two decimal places found in the front of your text) needed to

    asked on July 4, 2011
  93. english

    what's an introduction Thank you for using the Jiskha Homework Help Forum. An introduction "introduces" what you are going to say! The thesis statement could be in the introductory paragraph but it isn't necessarily always there. Here might be an easy way

    asked on October 22, 2006
  94. algebra

    approximate square root to the nearest integer-------- square root of 46

    asked on October 10, 2012
  95. chemistry

    A voltaic cell is constructed based on the following reaction and initial concentrations: Fe^2+,( 0.0055 M ) + Ag+,( 2.5 M ) ----> Fe^3+,( 0.0055 M ) + Ag(s)

    asked on March 28, 2009
  96. Calculus II

    A 24 foot ladder is leaning against a building. Let x be the distance between the bottom of the ladder abd the building and let theta be the angle between the ladder and the ground. Suppose the bottom of the ladder is sliding away from the wall at a rate

    asked on March 18, 2012
  97. math

    Find the missing angle 45 degree and 106 degree

    asked on March 17, 2010
  98. Physics

    A heavier mass m1 and a lighter mass m2 are 20.5 cm apart and experience a gravitational force of attraction that is 8.60 10-9 N in magnitude. The two masses have a combined value of 5.80 kg. Determine the value of each individual mass.

    asked on June 22, 2014
  99. US History

    The special protection the courts once granted property rights has been reduced so the government can A.regulate business more than in the past B. construct national infrastructure plans C. force redistribution of income D. implement collective laws I

    asked on December 12, 2018
  100. Maths

    Find the first four terms in the binomial expansion of (1+x)^(1/5) and state the range of values of x for which this expansion is valid.Hence approximate (31)^(1/5) correct to four decimal places.

    asked on July 8, 2015


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