Most popular questions and responses by Dana
  1. chemistry

    Calculate the expansion work done when 50 g of water is electrolysed under constant pressure at 25C

    asked on September 5, 2010
  2. english 4

    Change the italicized clause to a nominative absolute. Rewrite the entire sentence in the box below. As the hurricane season was over, people returned to the cottages on the beach. Change the italicized clause to a nominative absolute. Rewrite the entire

    asked on November 9, 2014
  3. Physics

    You're driving parallel to train tracks at 52.0 km/h when a train passes you, going a steady 91.0 km/h. A track crossing is up ahead, so you begin to speed up at 8.00 m/s2. How far do you drive before you pass the train?

    asked on September 21, 2016
  4. Calculus

    Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the y-axis (meaning it has no odd powers of x), and which has a y-intercept of 10, and global maxima at (3,253) and (−3,253).

    asked on April 7, 2013
  5. math

    Classify each quadrilateral using the best description

    asked on November 14, 2010
  6. chemistry

    Calcium carbonate CaCO3 reacts with stomach acid (HCl, hydrochloric acid) according to the following equation: CaCO3(s)+2HCl(aq)->CaCl2(aq)+H2O(l)+CO2(g) Tums, an antacid, contains CaCO3. If Tums is added to 35.0 mL of 0.300 M HCl,how many grams of CO2 gas

    asked on October 8, 2010
  7. math

    Solve the problem. A shirt company has 4 designs that can be made with short or long sleeves. There are 5 color patterns available. How many different types of shirts are available from this company? a. 9 types b. 40 types c. 11 types d. 20 types

    asked on May 4, 2008
  8. Chem

    List several anions, by formula, that contribute to the salinity of a water sample. Is this the answer? : chloride sulfate sodium , Na bicarbonate carbonate bromide fluoride What does it mean by formula? thanks so much !

    asked on September 9, 2015
  9. geometry

    the means of a proportion are 4 and 17. List all possible oairs of positive integers that could be the extremes of the proportion

    asked on November 15, 2011
  10. math

    Lin borrowed $950 for a new laptop. She will pay $25.80 each month for the next 48 months. Find the simple interest rate for her loan. (Rounded to the nearest 10th of a percent.)

    asked on January 22, 2015
  11. math

    How many distinguishable permutations of letters are possible in the word? BASEBALL a. 20,160 b. 10,080 c. 5040 d. 40,320

    asked on May 4, 2008
  12. macroeconomics

    Which of the problems in the construction of the CPI might be illustrated by each of the following situations?   Substitution Bias, Introduction of New Goods, Unmeasured Quality Change 1. The invention of the iPod 2. The introduction of air bags in cars

    asked on September 11, 2013
  13. statistics

    if you earned a 17 on a quiz what would your score indicate the best performance a. x=15 and s=2.4 b. x=15 and s=2.1 c. x=17 and s=2.4 d. x=17 and s=2.1

    asked on February 15, 2015
  14. Geometry

    The measures of 6 of the interior angles of a heptagon are: 120°, 150°, 135°, 170°, 90°, and 125°. What is the measure of the largest exterior angle? 90° 80° 75° 85°

    asked on January 23, 2012
  15. pre-algebra

    The number of cells in a lab sample triples every 4 hours. Write an expression to represent the number of cells after 24 hours. I think it might be x cubed times 6

    asked on November 5, 2014


    asked on April 17, 2011
  17. math

    TJ had a car loan for $5800. Over the course of the loan, he paid a total of $1508 in interest at a rate of 6.5%. Over how many months did TJ pay off the car loan?

    asked on January 22, 2015
  18. math

    Four accounting majors, two economics majors, and three marketing majors have interviewed for five different positions with a large company. Find the number of different ways that five of these could be hired. One accounting major, one economics major, and

    asked on May 4, 2008
  19. Algebra 1

    What is the simplest form of following expression -(8n-5v)

    asked on September 22, 2017
  20. physics

    a .105 kg hockey puck moving at 48 m/s is caught by a 75 kg goalie at rest. With what speed does the slide on the ice?

    asked on January 31, 2011
  21. Math

    Gabe placed $2000 in a certificate of deposit. He earned $10 in interest each month for the next 36 months. Find the annual simple interest rate for his certificate of deposit.

    asked on January 22, 2015
  22. physics

    A 1000-kg space probe is motionless in space. To start moving, its main engine is fired for 5 seconds during which time it ejects exhaust gases at 5000 m/s. At the end of this process it is moving at 20 m/s. The approx. mass of the ejected gas is??

    asked on October 10, 2010
  23. maths

    you have eight $1coins and five $2 coins in your pocket. What is the smallest number of coins you need to take out of your pocket to be certain of having atleast one of each coin?

    asked on March 30, 2017
  24. chem

    Why was a strong base (KOH) used in the synthesis of ferrocene? Why would a strong acid not be a suitable alternative?

    asked on March 28, 2009
  25. geometry

    Suppose points A, B, and C have the coordinates given below. Find y such that C is on the perpendicular bisector of segment AB. A(−1, 4), B(7, −2), C(9, y)

    asked on October 3, 2011
  26. physics

    what distance does the electromagnetic radiation travel in 50.0 (nu)s?

    asked on October 20, 2010
  27. chemistry

    Magnesium reacts with HCl to produce magnesium chloride and hydrogen gas. Mg(s)+2HCl(aq)->MgCl2(aq)+H2(g). What is the molarity of the HCl solution if 330 ml of the HCl solution reacts with magnesium to produce 7.40 L of H2 gas measured at STP?

    asked on October 9, 2010
  28. chemistry

    what is the osmolarity of a .20 M solution of Na3PO4?

    asked on October 19, 2010
  29. Algebra

    A farmer has 230 ft of fence to enclose a rectangular garden. What is the largest garden area that can be enclosed with the 230 ft of fence?

    asked on July 11, 2010
  30. economics

    how would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods? a.) the computer in invented b.)1 million farm workers remain unemployed for six months c.) a drought

    asked on April 7, 2011
  31. trig

    -Find sin(x+y), cos(x-y), tan(x+y) and the quadrant of x+y sinx=-3/5, cosy=-7/25, x and y in Q3

    asked on November 16, 2011
  32. chemistry

    2LiOH + Co2 = Li2CO3 +H2O If a cannister absorbed 100.0g of CO2 from the air that resulted in the production of 148.5g of Li2CO3, what was the percent yeild for Li2CO3.

    asked on April 19, 2011
  33. Business management

    television is an attractive advertising medium because it A. Offers mass coverage and flexibility B. is relatively expensive C. offers rapidly growing network audience D. provides instant feedback which can be used to measure effectiveness

    asked on March 20, 2014
  34. geometry

    Answer has to be in exact form. Find the area of the region between a regular hexagon with sides of 6" and its inscribed circle.

    asked on January 15, 2012
  35. arithmetic

    Jodi is cutting out pieces of paper that measure 8.5 inches by 11 inches from a larger sheet of paper that has an area of 1000 square inches. What is the area of each piece of paper that Jodi is cutting out?

    asked on October 14, 2014
  36. financial planning

    corp had earnings before taxes of $400,000 and sales of $2,000,000. If it is in the 40% tax bracket its after tax profit margin is?

    asked on July 21, 2012
  37. Microeconomics

    5. A drug company has a monopoly on a new patented medicine. The product can be made in either of two plants. The costs of production for the two plants are MC1 = 20 + 2Q1, and MC2 = 10 + 5Q2. The firm’s estimate of the demand for the product is P = 20 -

    asked on April 22, 2010
  38. math

    The arrow is spun several times until it stops at a number 4. Find the probability that this happens on the third spin.

    asked on March 21, 2015
  39. chemistry


    asked on April 19, 2011
  40. Geography

    How did geographic features help shape european cultures? Provide examples to support your answers.

    asked on October 7, 2009
  41. math

    To win the World Series, a baseball team must win 4 games out of a maximum of 7 games. To solve the problem, list the possible arrangements of losses and wins. How many ways are there of winning the World Series in exactly 6 games if the winning team wins

    asked on May 4, 2008
  42. Algebra

    In a class of 50 students, 29 are Democrats, 11 are business majors, and 5 of the business majors are Democrats. If one student is randomly selected from the class, find the probability of choosing: (a) Democrat who is not a business major. (b) A student

    asked on April 27, 2018
  43. math

    A flagpole stands at a right angle to the horizontal at the bottom of a slope. The slope has an incline of 8° with the horizontal. The flagpole casts a 20 meter long shadow up the slope. The angle of elevation of the sun is 17°. Determine the height of

    asked on July 21, 2012
  44. math

    which sets of ordered pairs represents a linear relationship? if the relationship is linear, calculate the rate of change of the dependent variable. 1. (-2,4),(-1,1),(0,0),(1,1),(2,4),(3,9) 2. (5,13),(6,15),(7,17),(8,19),(9,21),(10,23) 3.

    asked on March 4, 2015
  45. Chemistry

    Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). (a) What is the initial pH of the 0.25 M CH3NH2(aq)? (b) What is the pH after the addition of 15.0 mL of 0.35 M HCl(aq)? (c) What volume of 0.35 M HCl(aq) is required to reach

    asked on November 3, 2010
  46. Algebra

    Is 3x-4y=7 a direct variation Is 6x-3y=0 a direct variation?

    asked on March 16, 2011
  47. Math

    The equation of a circle C is x^2 +y^2 +2x−4y−44=0 x^2+y^2+2x-4y-44 =0 What is its center (h,k) and its radius r

    asked on December 31, 2011
  48. 11th grade Social Studies

    I was wondering what three thought provoking, open discussions could be that is related to President Wilson's 14 points and World War I might be? Do you have any ideas what I could do? My teacher is asking us, because the questions we write will be used

    asked on April 20, 2010
  49. Science

    Is toothpaste a mechanical mixture or a solution?

    asked on September 25, 2010
  50. Geometry

    The point A (3, 4) is reflected over the line x = 2, and then is reflected over the line x = -4. What are the coordinates of A'? (1, 2) (9, 4) (-9, 4) (1, 4)

    asked on January 23, 2012
  51. chemistry

    Balance the following redox reactions assuming a basic solution. Show all the steps. a. MnO2(s) -> MnO4^-2 + H2 (g) b. H2O2 (aq) + Cl2O7 (g) -> ClO2- (aq) + O2 (g) How can you balance these if for example in part a., there is no H on the left side... can I

    asked on November 1, 2010
  52. Statistics for social sciences

    For a population with u=50 and o=8, find the z-score for x=54, x=42, x=62 ,x=48 ,x=52 ,x=34

    asked on January 31, 2011
  53. physics

    a car starting from rest is accelerated at 2m/s(square) for 10s, then moves at constant velocity for 20s and then decelerates at 1m/s(square), finally stops. how far does it travel during its trip? please help me! I need in solution for that problem

    asked on September 4, 2010
  54. Finite

    One coin is fair and one is weighted so that Pr[H]=211. You randomly select one of the two coins, and flip it 5 times, noting the result of each flip. What is the expected number of heads?

    asked on October 13, 2015
  55. Physical Science

    a rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 381,000 km?

    asked on September 15, 2013


    asked on April 19, 2011

    4BF3+3H2O=H3BO3+3HBF4 if the reaction vessel contains 0.496 mol BF3 and 5.63g of H2O, which compound is the limiting reactant? how many molesof HBF4 can be produced?

    asked on April 19, 2011
  58. accounting

    Benjamin O'Henry has owned and operated O'Henry's Data Services since its beginning ten years ago. From all appearances, the business has prospered. In the past few years, you have become friends with O'Henry and his wife. Recently, O'Henry mentioned that

    asked on May 8, 2009
  59. Maths

    A blue train is 500m long and is travelling at 58km/h. A yellow train is 400m long and is travelling at 32km/h. The trains are travelling towards each other. Ooriginally, the trains are 900km apart. A) how long will it take for the 2 trains to reach each

    asked on October 4, 2016
  60. Math

    Find the probability for the experiment of tossing a six-sided die twice. Put the answer in a/b form. P(the sum is odd or prime)

    asked on April 28, 2015
  61. Geometry

    The point A (3, 4) is reflected over the line x = 2, and then is reflected over the line x = -4. What are the coordinates of A'? (1, 2) (9, 4) (-9, 4) (1, 4)

    asked on January 23, 2012
  62. english

    I need help on Eve Merriam (she is a poet). I have to answer the following questions: 1)Does the poet display similar themes in many different poems? Describe any reoccuring themes. 2)What was going on in the poet's lifetime? Did the time period the poet

    asked on May 17, 2011
  63. Fundamental Chemistry

    Given the balanced reaction below; write out the balanced ionic equation and the balanced net ionic equation. Include phase labels and charges where appropriate. Cu(s) + Zn(NO3)2 (aq) → Cu(NO3)2 (aq) + Zn(s)

    asked on April 13, 2016
  64. physics

    Approximately how far will the people have to travel to move the truck 1.5m if |Truck force is 4500N and people are 1200N?

    asked on November 29, 2011
  65. Chemistry

    What do I need from the data i collected from my experiment to get... moles of CaC2O4xH2o (or CaC2O4) percipitated (mol)

    asked on March 14, 2011
  66. Math

    At the end of each quarter, a 50-year-old woman puts $3000 in a retirement account that pays 5% interest compounded quarterly. When she reaches 60, she withdraws the entire amount and places it in a mutual fund that pays 6.9% interest compounded monthly.

    asked on November 7, 2010
  67. calculus

    Find an interval of t-values such that c(t)=(2t+1,4t-5) parametrizes the segment from (0,-7) to (7,7). What do you do???

    asked on March 10, 2010
  68. Physics

    An electron strikes the back of a TV screen at 1/10 the speed of light. What is the speed of the electron? What is the momentum of the electron? What is the deBrogile wavelength of the electron?

    asked on April 7, 2008
  69. maths

    Four girls each caught a fish while at the beach. Teri's was double the size of Jane's. Jane's fish was shorter than Lynn's by nine centimetres. Lynn's was 18 centimetres longer than Reina's who caught a fish 30 centimetres long. How long were Teri's

    asked on September 17, 2015
  70. Pleaaaaaase help with differential graph question

    Suppose further that the population’s rate of change is governed by the differential equation dP/dt = f(P) where f (P) is the function graphed. For which values of the population P does the population increase? (b) For which values of the population P

    asked on December 1, 2014
  71. Geometry

    The measures of 6 of the interior angles of a heptagon are: 120°, 150°, 135°, 170°, 90°, and 125°. What is the measure of the largest exterior angle? 90° 80° 75° 85°

    asked on January 23, 2012
  72. Chemistry

    A steel cylinder contains 128 grams of oxygen (O2) at 25*C and a pressure of 1000 torr. at STP 1 mol of a gas occupies 22.4 L. What is the volume in liters of the oxygen gas in the cylinder?

    asked on May 12, 2010
  73. Chemistry

    Acid is a proton donor and base is a proton accepter? first of all, please respond to this, i have a huge test tomorrow and would appreciate any help i can get! According to the Bronsted- Lowry model, acid gives a proton in an acid reaction and the base

    asked on March 25, 2009
  74. French

    I'm writing an essay on World War 2 in French and I was wondering if I have to change words like World War 2, Total War, and Allies and the Axis Powers to French. If so, what should I change them to? Here's my first paragraph for my essay. Can you please

    asked on January 7, 2008
  75. Calculus

    Hi! I need help with this problem: For 0(smaller or equal to) t (smaller or equal to) 9, a particle moves along the x-axis. The velocity of the particle is given by v(t)= (sin pi/4 t). The particle is at position x= -4 when t=0. a) For 0 (smaller or equal

    asked on December 11, 2014
  76. math

    Three boys are sharing a cake. Joey ate 2/5 of the cake, Billy ate 1/3 of it, and Matt ate the remaining piece. What is the ratio of Joey's piece to Billy's piece to Matt's piece?

    asked on March 14, 2014
  77. Zion Chapel

    explain how to find 40x50 usine mental math?

    asked on October 24, 2012
  78. Chemistry

    A certain weak base has a Kb of 8.10 × 10-7. What concentration of this base will produce a pH of 10.00?

    asked on October 25, 2011
  79. english

    Pronouns used as subjects or subject complements are in the nominative case. True or False

    asked on January 4, 2011
  80. chemistry

    If 1.70 liters of 0.670 M CuSO4 solution is electrolyzed by passing 4.70 amps through the solution for 3.00 hr using inert electrodes. (a) As electrolysis proceeds, how does the acidity of the solution change? (b) How many grams of Cu metal are formed at

    asked on November 19, 2010
  81. Physics

    A 0.60-kg particle moves along the x-axis. Its potential energy is given by U(x)=5x^2, where U is joules and x is in meters. If the particle has a speed of 3.0m/s what it is at x=1.2m, its speed when it is at the origin is?

    asked on October 10, 2010
  82. chemistry

    What clear liquid has a density of 0.814 g/mL but is not an alcohol?

    asked on September 27, 2009
  83. Psycology

    I am trying to find peer reviewed articles about a movie, "The Bad Seed" made in 1956 from a play that was written by William Edward March Campbell. I must analyize it along with the nature vs nuture debate for my Abnormal psyc class. I am trying to

    asked on October 10, 2008
  84. literature

    How is the concept of cultural encounter treated in the short story “One out of Many”?

    asked on April 23, 2017
  85. science

    which of the following cellular organelles is responsible for realising the energy contained in food

    asked on April 27, 2016
  86. Homework helpline?

    Is there a homework helpline for college level I can call and ask homework questions through the phone? I know there is one that is available for elementary school and middle school, and it would seem a little ludicrous for one to be available for this

    asked on April 28, 2014
  87. Algebra

    Find the account of simple interest earned if you invest $9000 at 0.04% interest for 20 years. Then find the account balance.

    asked on February 3, 2013
  88. fractions

    If you have eight cookies and you give one fourth away, how many cookies are left?

    asked on December 7, 2012
  89. geometry

    Answer has to be in exact form.Find the area of a segment formed by a chord 8" long in a circle with radius of 8".

    asked on January 15, 2012
  90. math

    write a cosecant function with a period of 4pi, phase shift of 4 pi, and vertical shift of 8. My answer:csc(theta/2-8pi)-8

    asked on August 10, 2011
  91. Algebra

    Solution A is 30% acid and solution B is 60% acid. How many gallons of each solution must be used to create a 60 gallon mixute that is 50% acid. I have to set this up as a system of equations, and I thought one system was x + y = 60, but I can't get an

    asked on September 1, 2009
  92. art history

    Using Durer’s engraving "Knight, Death and the Devil" discuss what aspects of Durer's style show his interest in the concerns of Italian Renaissance artists and what aspects show that his roots are in the painting and printmaking traditions of northern

    asked on April 4, 2008
  93. Math

    1) A helium balloon is rising according to the function H(t) = -7x^2 + 5x - 11 where h(t) is the height in meters after t seconds. Determine the average rates of increase of height from t=7 to t=23 seconds. I tried h(23) - h(7) ------------ 23-7 = * in

    asked on January 22, 2008
  94. French

    En 1939, des militaires globaux étaient en conflit et la Deuxième Guerre Mondiale commence. Elle a divisé plusieurs nations du monde en deux alliances militaires : les Alliés et les puissances d'Axe. La Deuxième Guerre Mondiale a été connue comme le

    asked on January 13, 2008
  95. Maths

    A plane is flying at an altitude of 880 m. Sarah is standing on the ground and she observes the angle of elevation to the plane as 67'40'. Twenty-five seconds later the angle of elevation had changed to 24'30'. (a) How far has the plane flown in that time?

    asked on February 5, 2016
  96. chemistry

    Gasoline sold in Ontario must contain at least 5.00% v/v ethanol? How much gasoline contains 1.50 L of ethanol? my answer is 22.5 ml is this correct

    asked on December 16, 2014
  97. chemistry

    Calculate the heat transferred when a 8 g of iron nail is cooled from 50oC to 18oC. The specific heat of iron is 0.45 J/goC.

    asked on December 4, 2011
  98. Earth Science?

    What is the climate? Darwin, Australia has its coolest month in July, with an average temperature of 77 degrees F. It has a dry season from May to October. The grassy areas nearby are home to cattle ranches. a) Not tropical b) Tropical rainforest c)

    asked on May 20, 2011
  99. University of phoenix mat116

    use multiplying by 1 to find expression equivalent to 16/17 with denominator of 102d

    asked on November 1, 2010
  100. Chemistry

    density- 0.818g/mL boiling point- 78.5 degrees C heat of vaporization- 210cal/g a)How much energy, in calories, will be required to evaporate 125.0 mL of ethanol at its boiling point? b)How long will it take to add this energy, if the rate of heating is

    asked on September 1, 2009


  1. 1
  2. 2
  3. 3