Popular questions and responses by Paula
  1. Algebra

    What inequality represents the verbal expression all real numbers less then 69? My answer is x

    asked on September 14, 2014
  2. Algebra

    Sis the set of prime numbers that are less than 15. My answer is 2,3,5,7,11, and 13

    asked on September 16, 2014
  3. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. kPa1: 2.16 kPa2: 7.21 kPa3:12.32 [H3PO4] = ?

    asked on March 10, 2013
  4. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. pKa1: 2.16 pKa2: 7.21 pKa3: 12.32 Hint: Convert

    asked on March 9, 2013
  5. Algebra

    What is the value of the first term of the sequence a n =n-1 ?

    asked on September 13, 2020
  6. statistics

    a pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. how large should the sample be if she wishes to be accurate to within $0.15? a previous study showed that the standard deviation of the price was

    asked on March 17, 2013
  7. math

    The figure shown the chain drive of a bicycle. How far will the bicycle move if the pedals are rotated at 180°. Assume the radius of the bicycle wheel is 13.6 inches. There's a small circle w/a radius of 1.38 in and a large circle w/ 4.33 in.

    asked on November 17, 2010
  8. science

    why does a cool, distant, supergiant star such as Betelgeuse have such a high apparent magnitude? PLEASE HELPPPPP!!!!!!

    asked on March 21, 2012
  9. physics

    Scientists want to place a 3300 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 2.2 times the radius of Mars above the surface of the planet. Here is some information that will help solve this problem: mmars =

    asked on September 13, 2014
  10. physics

    A single mass (m1 = 3.1 kg) hangs from a spring in a motionless elevator. The spring constant is k = 338 N/m. 1. What is the distance the spring is stretched from its unstretched length? 2. Now, three masses (m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2) hang

    asked on October 13, 2018
  11. chem

    what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL

    asked on February 12, 2011
  12. Music

    What is the vertical line at the end of a measure called?

    asked on September 11, 2014
  13. Com 425

    Which of the following statements is an example of metacommunication? 1) "Lets introduce ourselves one at a time." 2) Don't call me names!" 3) I think we should take this vote to the Board." 4) Let's agree to not discuss old issues today."

    asked on July 17, 2016
  14. math

    130 square root to the nearest hundredth.

    asked on February 24, 2014
  15. Calculus

    A rocket is fired vertically into the air at the rate of 6 miles/min. An observer on the ground is located 4 miles from the launching pad. When the rocket is 3 miles high, how fast is the angle of elevation between the rocket and the observer changing?

    asked on November 2, 2014
  16. Physics 212

    Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges

    asked on February 14, 2013
  17. Algebra

    solve and show steps 6=x+2/3

    asked on September 13, 2014
  18. Physics

    David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?

    asked on August 25, 2014
  19. Earth Science

    A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour

    asked on September 29, 2013
  20. science

    When does a sedimentary rock become a metamorphic rock?

    asked on October 2, 2020
  21. chemistry

    Calculate the pH of a buffer which contains 0.0500 M pyruvic acid and 0.0450 M sodium pyruvate. (The Ka of pyruvic acid is 4.1 × 10–3)

    asked on March 27, 2015
  22. physics

    A skier of mass 74.6 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.3 m up a 39.0◦ slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s 2 . Answer in

    asked on January 29, 2015
  23. Music

    if you add up the durations from left to right on any level of a note tree you end up with a what?

    asked on September 11, 2014

    A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

    asked on April 19, 2013
  25. science

    If Deneb and Rigel were located at alpha Centauri's distance from earth, how would they appear? PLEASEEE HELPPPPPP!!!!!!!!!!

    asked on March 21, 2012
  26. chemistry

    What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

    asked on March 29, 2015
  27. Math

    A man has three times as many quarters as half-dollars, four times as many dimes as quarters, and two more nickels than dimes. If he has $9.25, how many of each coin has he?

    asked on February 27, 2017
  28. Equivalent Payments

    Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

    asked on September 18, 2016
  29. Trig

    Given that cos θ = 5/13 and θ is in QIV, find the exact value of a. y b. sin θ c. sec θ d. tan θ

    asked on August 7, 2013
  30. bearing

    A ship is due east of a harbour. Another ship is also 3km from the harbour but on a bearing 042 degrees from it a. Find the distance between the two ships b. Find the bearing of the second ship from the first ship

    asked on May 13, 2017
  31. chemistry

    Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp = 2.34 × 10–59; Molar mass = 502.3 g/mol? I keep getting 5.83x10^-18 g but the answer is supposed to be 4.35x10^-5 g. I don't

    asked on March 29, 2015
  32. public speaking

    Medium that carries message signals from senders to receivers of communication is

    asked on September 28, 2014
  33. Physics

    02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his

    asked on August 25, 2014
  34. Lincoln College Of New En

    the average 1-ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1-ounce chocolate chip cookies results in the following calorie amounts, at the a = 0.01 level, is there sufficient evidence that the average

    asked on April 26, 2013
  35. Lincoln College Of New En

    How man 4 letter code words can be made using the letters in the word pencil if repetitions are permitted?

    asked on April 4, 2013
  36. English

    The toy car of jess is new

    asked on July 13, 2017
  37. Math

    Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

    asked on September 18, 2016
  38. biology

    identify and describe how organism could respond to an external stimulus

    asked on August 14, 2013
  39. Lincoln College Of New En

    The percentage of physicians who are women is 27.9% in a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. Is there sufficient evidence at the 0.05 level of significance to conclude that

    asked on April 26, 2013

    the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

    asked on April 19, 2013
  41. chemistry

    quarters are 91.67% mass/mass copper and 8.33% mass/mass nickel. if the average quarter weighs 5.67 grams, how many atoms of nickel are in a quarter?

    asked on April 22, 2011
  42. Chemistry

    In a certain reaction, 300.23 grams of solid aluminum sulfide combine with unlimited aqueous silver nitrate. How many moles of aluminum sulfide react? How many moles of each product will be produced? First of all, is the reaction a double replacement or

    asked on December 7, 2009
  43. Chemistry

    CO(g) + 2H_2(g) CH_3OH (g) deltaH=-90.7kJ Methanol is prepared industrially from synthesis gas (CO and H_2) Would the fraction of methanol obtained at equilibrium be increased by raising the temperature? Explain. Thank you :)

    asked on March 1, 2018
  44. finance

    Given an interest rate of 7.2 percent per year, what is the value at Year 9 of a perpetual stream of $3,950 payments that begin at Year 19

    asked on October 18, 2015
  45. math

    compare write >or< for 2,854,376 to 2,845,763

    asked on August 21, 2014
  46. math

    208 square root to nearest hundredth.

    asked on February 24, 2014
  47. Math

    X^ -3 = 216 How do you find x?

    asked on December 18, 2013
  48. Math

    True or False. The value of the square root of 16 is greater than the cube root of 29.

    asked on July 21, 2013
  49. Lincoln College Of New En

    it has been found that 85.6% of all enrolled college and university students in the U.S. are undergraduates. A random sample of 500 enrolled college students in a particular state revealed that 420 of them were undergraduates. Is there sufficient evidence

    asked on April 26, 2013
  50. algebra

    A rock is thrown upward with a velocity of 15 meters per second from the top of a 26 meter high cliff ad i misses the cliff on the way back down. when will the rock be 5 meters from the water below?

    asked on February 15, 2013
  51. science

    water in gas form is called

    asked on January 8, 2013
  52. Maths

    7y = 49w - 35 I am not sure how the working out goes

    asked on October 14, 2012
  53. statistics

    A salesperson has found that the probability of making various numbers of sales per day is presented in the following table. Calculate the expected number of sales per day and the standard deviation of the number of sales. Number of sales(Probability)

    asked on April 9, 2011
  54. algebra

    what is the equation of the ellipse with goci at (0,-4) and (0,4) and the sum of its focal radii being 10?

    asked on March 20, 2010
  55. chemistry

    What happens when : (give balanced chemical equations only) 1. Caustic soda reacts with carbon dioxide 2.caustic soda reacts with zinc hydroxide 3.potassium reacts with oxygen 4.sodium carbonate is fused with silicon dioxide 5. when bleaching powder reacts

    asked on March 10, 2010
  56. chemistry

    a thermometer containing 9.5g of mercury has broken. If Mercury has a density of 13.6g/ml what volume spilled

    asked on July 12, 2015
  57. Medical billing and Coding

    What is defined as improper behavior or billing practices that result in financial gain? I have looked all through the text and cannot find the answer.

    asked on March 26, 2015
  58. chemistry

    Suppose that the reaction of Fe3+ and SCN- produces Fe(SCN)2 (+). 5.00mL of 2.0mM Fe3+ is mixed with 5.00 mL of 2.0mM SCN-. The student finds the equilibrium concentrations of Fe(SCN)2(+) to be 0.3mM. 1.) What is the initial number of moles of each species

    asked on February 23, 2015
  59. Algebra

    Choose them compound inequality that represents all real numbers that are less then -3 or greater than or equal to 5.

    asked on September 17, 2014
  60. chemistry

    When 30.0g of aluminum reacts with HCl, how many grams of aluminum chloride are formed? Al + HCl --> AlCl3 + H2

    asked on July 15, 2013
  61. Math

    Are these true or false? 1. If s is negative, then the square root of s^2 is -s. 2. If r is positive, then the square root of r^2 is -r. 3. If q is negative, then the square root of q^2 is q. 4. If p is positive, then the square root of P^2 = p. If

    asked on July 15, 2013
  62. Lincoln College Of New En

    A survey by Men’s Health magazine stated that 14% of men said they used exercise to reduce stress. Use a = 0.10. a random sample of 100 men was selected and 10 said that they used exercise to relieve stress. Use the P –value method to test the claim.

    asked on April 26, 2013
  63. Lincoln College Of New En

    26 Gasoline Mileage for Autos and Trucks – Of the top 10 cars and trucks based on gas mileage, 4 are Hondas, 3 are Toyotas, and 3 are Volkswagens. Choose one at random. Find the probability that it is Japanese, Japanses or German or not foreigh.

    asked on April 6, 2013
  64. chemistry

    draw particle diagrams that account for the fact that 2 volumes of nitric oxide gas react with 1 volume of oxygen gas to form 2 volumes of product with no leftover gas

    asked on April 5, 2013
  65. Living Environment

    How one type of atom (carbon)can be the basis of so many types of biomolecules?

    asked on October 8, 2012
  66. math

    Explain why there is no number that can replace n to make the equation /n/ = -3 true.

    asked on October 7, 2012
  67. Mathamatics

    find the value of r in terms of T (2r+ 3T)/2 = (2r-T)/3 please help me!

    asked on October 9, 2011
  68. Math

    four times the difference or two posotive integer numbers is equal to half the sum of the numbers. If one of the numbers is 14, what is the other number? I just cant get this can anyone help me?

    asked on October 9, 2011
  69. chem

    need help with the following conversion Calculate the mass in pounds of one gallon of water given that the density of water is .0 g/ml

    asked on October 4, 2011
  70. Material Physics

    Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen

    asked on May 24, 2011
  71. Algebra

    A riverboat cruise line has a boat that can travel 76 mi downstream in the same time that it takes to travel 52 mi upstream. The speed of the current in the river is 1.5 mph. Find the speed of the boat in still water.

    asked on March 7, 2011
  72. math

    It is known from experience that in a certain industry 40 percent of all labour-management disputes are over wages, 40 percent are over working conditions, and 20 percent are over fringe benefit. Also, 9 percent of the disputes over wages are resolved

    asked on March 5, 2011
  73. math

    julie arrived 20 minutes before the race began. she started right on time. it took her 24 minutes to finish the6-kilometer race. she stayed 10 minutes after the race to cool off; she left. if she arrived at the race at 9:10a.m., what time was it when she

    asked on March 31, 2010
  74. College chemistry

    103.5 mL of hydrogen are collected over water at 22.2 degrees Celsius and 758.2 torr from reaction with 0.1356 grams of alloy. calculate the number of moles of dry hydrogen gas that were collected.

    asked on March 30, 2010
  75. math word problem

    The sum of a number and its square is 72. What is the number? I took a guess at 8, but I don't know how to put it in an equation form.

    asked on March 22, 2010
  76. math word problem

    how many ways can you arrange 6 books on a shelf horizontally?

    asked on March 22, 2010
  77. Math word problem

    Which would you rather be paid for 12 days - $100 per day for the 12 days or one dollar for the first day, $2.00 the second, $4.00 the third, $8.00 the fourth, etc., up to and including the 12th day?

    asked on March 21, 2010
  78. math word problem

    Jim is making a diagram of the solar system. If he draws Neptune, which is 2795 million miles from the sun, 10 inches from the sun on his paper, how far away (to the nearest tenth of an inch) from the sun should he draw Mars, which is 142 million miles

    asked on March 21, 2010
  79. algebra

    what are the x-intercepts, the extent of the graph and the asymptotes for x^2/16-y^2/25 = 1

    asked on March 20, 2010
  80. science

    why is Drosophila melanogaster named so?

    asked on March 4, 2010
  81. trig

    cos2(120degrees) help me solve this please

    asked on January 23, 2010
  82. math

    Heidi has a brown pair and a gray pair of slacks; a brown blouse, a yellow blouse, and a white blouse: and a blue sweater and a white sweater. How many different outfits does she have if each outfitshe wears consists of slack, a bluse, and a sweater?

    asked on August 8, 2009
  83. sociology

    functionalism, conflict theory, symbolic interactionism

    asked on July 28, 2009
  84. sociology

    Which of three theoretical perspectives best explains the fact that Americans find work roles psychologically satisfying but also find them to be stressful?

    asked on July 28, 2009
  85. Geometry

    Two ships leave San Francisco at the same time. One travles 40 degrees W of N at the speed of 20 knots. The other travels 10 degrees W of south at a speed of 15 knots. How far apart are they after 11 hours?

    asked on March 3, 2008
  86. Food and Nutrition

    How can food spices be either an obstacle or an aid to blending into a new culutre? If you prefer to eat highly spiced or seasoned foods, you might not want to eat the foods that are popular in your new culture. I knew a Vietnamese man who lived in the

    asked on March 29, 2007
  87. Chemistry

    I have one more question DrBob, I have draw a structure of this polymer CH2=CH-CH-OH ' CH3 and identify the monomer units. Would the mononer unit be this: CH2-CH-CH-O ' CH3 AND WOULD THIS POLYMERIZATION BE A CONDENSATION TYPE? Paula--I am not an organic

    asked on February 20, 2007
  88. Economics

    QA=96-2PA_3PB QB=30-25PA+0.32Y Given that PA=2,PB=4,Y=1000

    asked on February 19, 2020
  89. Chemistry

    What are the moles of substances present at equilibrium at 450C if 1 mol N2 and 4 mol H2 in a 10 L vessel react according to the following equation? N2 (g) + 3H_2(g) ⇌ 2NH_3 (g) The equilibrium constant Kc is 0.153 at 450C. Thanks a lot.

    asked on March 1, 2018
  90. Math

    Directions are "Order these integer decimals from least to greatest: +.125, -.1428, -0.025 (with a repeating 5), 0.2. I'm thinking that ordering from least to greatest would be: -.1428, -0.025, .125, 0.20

    asked on November 12, 2016
  91. Math

    The first question is show how to make one addend the next tens numbers. Complete the new addition sentence: 15 + 37= I need a break down to how to to figure this out. Please.. I have no clue what to do.

    asked on October 24, 2016
  92. COM425

    Abdoulaye tells his teammate Rick that he prefers to be called “Abdoulaye”; yet Rick continues to call him “Abdou.” This is a violation of __________ rules. 1) communication 2) relational 3) interpersonal 4) corporate (I think its relational, not

    asked on July 17, 2016
  93. math

    Write ( 1 9 ) 3 as a product of the same factor. Then find the value

    asked on January 15, 2016
  94. Physics

    A steel ball of mass 8.0 kg and traveling at 3.0 m/s [E] has a head-on elastic collision with a brass ball which is at rest. After the collision, the velocity of the brass ball is 4.0 m/s [E]. Find: a)the velocity of the steel ball after the collision b)

    asked on January 13, 2016
  95. Geography

    A bolt of cloth containing 25yd 6in. Was cut into 6 pieces. How long was each piece?

    asked on December 1, 2015
  96. Integral calculus

    The length of each leg of an isosceles right triangle is increase at the rate of 2 mm/s. How fast is the hypotenuse increasing at the moment when each leg is 10 mm?

    asked on July 25, 2015
  97. chemistry help

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked on March 30, 2015
  98. chemistry

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked on March 28, 2015
  99. chemistry

    What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

    asked on March 28, 2015
  100. calculus

    Find the intervals on the x-axis on which the function f(x) is increasing and those which it is decreasing, where f(x) = (x)/(x^2+1) I differentiated and got f'(x)=(x^2+1) -(x)(2x) all over (x^2+1)^2 But I don't know what to do now...

    asked on March 25, 2015


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