Most popular questions and responses by Rebecca
  1. math

    Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07

    asked on May 4, 2013
  2. Algebra help??!!

    I'm really confused with sets, could someone please check my answer?? I just really don't want to get it wrong... You have two boxes of colored pens, The first box contains a red pen, a blue pen, and a green pen, The second box contains a yellow pen, a red

    asked on October 19, 2017
  3. Grade 12 Data Management

    There are 12 questions on an examination, and each student must answer 8 questions including at least 4 of the first 5 questions. How many different combinations of questions could a student choose to answer?

    asked on September 27, 2011
  4. Chemistry

    A voltaic cell utilizes the following reaction: 2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq). What is the emf for this cell when [Fe3+]= 3.70M , PH2= 0.95atm , [Fe2+]= 7.0×10−4M , and the pH in both compartments is 4.05? Express your answer using two significant

    asked on April 14, 2014
  5. Chemistry

    You can purchase hydrochloric acid in a concentrated form that is 37.0 hcl by mass and has a density of 1.20g/mL. Describe how exactly you would prepare 2.85 L of 0.500 M HCL from the concentrated solution.

    asked on May 7, 2014
  6. Chemistry

    Given the following half-reactions and associated standard reduction potentials: AuBr−4(aq)+3e−→Au(s)+4Br−(aq) E∘red=−0.858V Eu3+(aq)+e−→Eu2+(aq) E∘red=−0.43V IO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq) E∘red=+0.49V

    asked on April 14, 2014
  7. #3 Fitness (Check answers)

    1) The first step in the decision-making process is to brainstorm all possibilities (my answer) evaluate the result act realize there is a problem 2) Evidence that you have accomplished a goal is an example of which step in the SMART goal method? specific

    asked on April 25, 2016
  8. math

    If is a line whose equation is y = 2x- 1, find the equation of the image of under each of the following translations:(x, y) S (x +3, y)

    asked on February 27, 2010
  9. physics

    A daredevil decides to jump a canyon of width 12 m. To do so, he drives a motorcycle up an incline sloped at an angle of 14.2◦. The acceleration of gravity is 9.8 m/s2 . What minimum speed must he have in order to clear the canyon? Answer in units of

    asked on January 8, 2015
  10. Chemistry

    Hello! I really need help with this. Name the following salts according to the old -ic, -ous system and the stock system. a. CrS b. Cr2O3 c. CrI3 X 6H20 d. CuCl e. CuI2 f. CuBr2 x 4H20 g. HgCl2 h. Hg2Cl2 i. Fe (OH)3 I am totally lost. I don't know how to

    asked on September 29, 2015
  11. Math

    A construction crew wants to hoist a heavy beam so that it is standing up straight. They tie a rope to the beam, secure the base, and pull the rope through a pulley to raise one end of the beam from the ground. When the beam makes an angle of 40 degrees

    asked on April 16, 2015
  12. Language arts

    You meet Tock and Hambug in Act I of The Phantom Tollbooth. In Act II, you see them in action and hear more of what they have to say. How are the two characters alike? How are the two characters different? What do they do to help Milo? tell two ways for

    asked on March 15, 2018
  13. Chemistry

    How many grams of H2O are required to react with excess CaC2 to produce 23.0 g of C2H2 according to the following equation? CaC2 + 2H2O -> Ca(OH)2 + C2H2 a.4.5 b.15.9 c.31.8 d.1.766 I think this equation works out by multiplying 2 moles by the molar mass

    asked on October 27, 2016
  14. Critical thinking

    I'm having trouble rewriting the ambiguous sentences. I have answered them but i'm not sure that they are right. 2. Please close the door behind you. My answer: Please close the door that is behind you. 3. we heard that he informed you of what he said in

    asked on June 15, 2012
  15. Science

    A blue-eyed man, both of whose parents were brown-eyed, marries a brown-eyed woman whose father was blue-eyed and whose mother was brown-eyed. This man and woman have a blue-eyed child. What are the genotypes of all these individuals?

    asked on February 23, 2012
  16. chemistry

    What is the explanation for the discrete lines in atomic emission spectra?

    asked on January 12, 2009
  17. Math

    Kevin has 18 unit cubes. How many different rectangular prisms can be built using all the cubes

    asked on April 21, 2013
  18. life orientation

    assess the extent to which bad road use has a direct impact on the physical, emotional, social and economic aspects to the family, the community and the country.

    asked on August 12, 2015
  19. math

    The first ancient olympic games were held in 776 b.c. the ancient games were abolished in 393 a.d. The first modern olympics were held in 1896 a.d. a) How many years were there between the firstancient games and the year they were abolished? b) How many

    asked on May 7, 2009
  20. Maths

    Find the sum of the following series: 1024 - 512 + 256 - 128 +...+ 1 So a = 1024, r = -0.5, but I need to know what n is in order to use the formula. So I tried ar^(n-1) which is: 1024(-0.5)^n-1 = 1 but I don't know how to find n from there. Thanks in

    asked on April 7, 2016
  21. English Check answers

    Transportation Strike Disrupts Westridge Thousands unable to get to work or school WESTRIDGE, Ohio—More than 600 transportation employees went on strike at midnight last night after the Westridge City Council rejected their demand for a 10% pay increase.

    asked on June 30, 2016
  22. math

    Two circles meet at A and B. A chord CD of one circle is produced to meet the other circle at E and F so that CDEF is a straight line, as shown. The common chord AB is produced to meet the line CF at a point M between D and E. If M is the midpoint of CF

    asked on July 21, 2019
  23. english

    what are some poetic devices used in the following poem? "Mending Wall" by Robert Frost Something there is that doesn’t love a wall, That sends the frozen-ground-swell under it And spills the upper boulders in the sun, And makes gaps even two can pass

    asked on November 7, 2010
  24. Chemistry

    The radius of a chromium atom is 125 pm. How many chromium atoms would have to be laid side by side to span a distance of 4.14 mm?

    asked on September 17, 2012
  25. math

    A circle with diameter r is internally tangent to a circle with radius r at the point T. For some other point S on the larger circle, chord ST intersects the smaller circle at point X, and the tangents to a larger circle at S and T meet at point Y. Show

    asked on August 13, 2019
  26. math againn (converting decimals)

    Write 6.4% as a decimal and as a fraction. Write 2 and one fourth as a decimal and as a percent. To convert from percent to decimal simpoy divide by 100. 6.4% = 0.064. To convert to fraction (do you want a mixed fraction or not? and percent or not?). For a

    asked on August 22, 2006
  27. Chemistry

    How many grams of SO3 are produced when 20 g FeS2 reacts with 16g O2 according to the balanced equation? 4FeS2(s)+15 O2(g)>>>2Fe2O3+8SO3(g)

    asked on September 26, 2011
  28. Chemistry

    The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6×108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1×105 and 6.3×108 molecules cm−3,

    asked on March 25, 2014
  29. 11Science

    A diploid organism has five pairs of chromosomes in each somatic cell. Assuming that no crossing over occurs, how many genetically distinct gametes can this organism produce?

    asked on February 15, 2012
  30. Chem

    Name the following binary compounds consisting of two nonmetals or a metalloid and a nonmetal. 1. AsH3= arsine 2. AsF5= arsenic pentafluoride 3. HCL= Hydrogen chloride is this right?

    asked on September 29, 2015
  31. poetry

    "If Whales Could Think On Certain Happy Days" by Irving Layton As the whale surfaced joyously, water spouted from his head in great jets of praise for the silent, awesome mystery he beheld between sea and sky. Thankfulness filled his immense body for his

    asked on January 18, 2010
  32. Astronomy

    Suppose that you travel to a planet that has 4 times the Earth's mass and 4 times the Earth's radius. Calculate how much more or less you would weigh on this planet compared to your weight on Earth. Express your answer as a factor or fraction of your

    asked on October 1, 2011
  33. density

    Suppose two worlds, each having mass M and radius R, coalesce into a single world. Due to gravitational contraction, the combined world has a radius of only 3/4R. What is the average density of the combined world as a multiple of p0, the average density of

    asked on December 1, 2013
  34. math

    The perimeter of the small square is one-third the perimeter of the large square. What are the side lengths of the squares? small square side = x large square side = x + 2

    asked on March 31, 2010
  35. Math

    Nissan Appliances bought three dozen camcorders at a cost of $5,040. The markup on the camcorders is 30% of the selling price. What was the original selling price of each camcorder?

    asked on February 22, 2014
  36. English

    Is this paragraph’s main idea stated or implied? The greatest gift the Sumerians gave the world was the invention of writing. The Sumerians were a wealthy people. They needed some way to keep track of what they owned. They began drawing pictures. They

    asked on June 24, 2016
  37. Chem

    Suppose the water sample has a relatively high percent of volatile solid material. How would this have affected the reported mass of: a. dissolved solids -- too high, too low, or unaffected? Explain. TDS will be unaffected b. total solids -- too high, too

    asked on September 30, 2015
  38. Social Studies

    Who's job is it to line up the votes of the members of the party that holds the most seats in a chamber? A) president pro tempore B) Speaker of the house C) Minority whip D) majority whip **** The president of the Senate also serves as the _____? A) Head

    asked on January 19, 2017
  39. Math

    The entire can needs to be painted, including the top and bottom. If the diameter of the lid (x) is 5 cm, and the height of the can (y) is 9 cm, what is the approximate total surface area that will need to be painted?

    asked on June 17, 2014
  40. AP Chemistry

    A 2.685 g sample of KHC8H4O4 was dissolved in water and uses to standardize a NaOH solution. The endpoint was reached after 38.25mL of titrant were delivered. Find the molar concentration of the NaOH solution.

    asked on February 4, 2018
  41. Gr10 math

    A rectangular lawn measuring 8m by 4m is surrounded by a flower bed of uniform width. The combined area of the lawn and the flower bed is 165m^2. What is the width of the flower bed?

    asked on May 31, 2011
  42. Biology I

    Charles Darwin- Evolution? 2) Where does variation occur within an organism that causes evolution? 5) What is the main source of evidence for evolution? 6) What was the occupation that Darwin was originally studying for? 8) What did Darwin believe about

    asked on January 27, 2009
  43. History

    1) Which of the following best describes Affirmative Action? a) It was a way to fight corruption within the US government. b) The actions taken to instill new anti immigration laws. c) Of solving economic and educational discrimination. d) Of solely

    asked on May 13, 2015
  44. conclusions

    What function do conclusions serve in essays? A. Conclusions provide the supporting details of an essay. B. Conclusions develop the main idea of an essay. C. Conclusions sum up the main idea of an essay. (MY ANSWER) D. Conclusions introduce new ideas

    asked on July 5, 2016
  45. Physics

    How much power is required to lift a 25kg box to the top of a 4 meter flight of stairs in 3.5 seconds

    asked on November 24, 2018
  46. Science

    In witch type of symbiotic relationship is one organism helped while another organism is neither benefited nor harmed?

    asked on February 26, 2019
  47. History

    Which of the following statements most accurately analyzes how the Philadelphia Convention shaped the new national government?

    asked on December 6, 2017
  48. Physics (algebra-based)

    A child holds a candy bar 13.4 cm in front of the convex side-view mirror of an automobile. The image height is reduced by one fifth. What is the radius of curvature of the mirror? Answer in units of cm. I did 1/5=-image distance (i)/13.4-->i=-2.68

    asked on December 1, 2013
  49. History

    How did the legal opinion of John Marshall shape the US government?

    asked on December 6, 2017

    A water pistol aimed horizontally projects a stream of water with an initial speed of 5.00 m/s. (a) How far does the water drop in moving 1.00 m hori- zontally? (b) How far does it travel before dropping a vertical distance of 1.00 cm?

    asked on January 30, 2012
  51. chemistry

    using VSEPR THEORY explain why 1)BF4- is a tetrahedral molecule 2)SF3+ is a Trigonal pyramidal molecule 3)ICI4- IS A SQUARE PLANER molecule 4IF5 IS A SQUARE pyramidal molecule 5)PF5 IS A TRIGNAL BIPYRAMIDAl molecule help Dr bob222

    asked on December 16, 2011
  52. Math

    The admission to a local fair is $10 for an adult and $6 for a child. Each ride costs $1.50 for and adult and $1 for a child. Write an expression that represents how much more an adult will spend.

    asked on November 8, 2016
  53. Rational Functions

    Write an equation for a rational function whose graph has the following properties: x-intercept of 3 y-intercept of -3 vertical asymptote of x=-2 horizontal asymptote of y=2

    asked on October 6, 2014
  54. Vectors

    A 80-N force is applied to the end of a 50-cm wrench and makes an angle of 45° with the handle of the wrench. a) What is the torque on a bolt at the other end of the wrench? b) What is the maximum torque that can be exerted by a 100-N force on this wrench

    asked on July 19, 2019
  55. conclusions - check answer

    Which of the following is a true statement about writing introductions of rough drafts? A. Do not worry about the central point of your essay; it will happen later on as you revise your paper. (MY ANSWER) B. Pay close attention to the correct spelling of

    asked on July 5, 2016
  56. Chemistry

    Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true? 1) Limiting reactant (L.R.) is one with higher molar mass 2) A is L.R. because you need 6 moles of A and have only 4 moles 3) B is L.R. because you have

    asked on February 1, 2017
  57. Calculus

    A wire 60 cm long is to be cut into two pieces. One of the pieces will be bent into the shape of a square and the other into the shape of an equilateral triangle, as shown in the diagram below: a diagram showing a 60 cm wire cut into two pieces of length x

    asked on July 19, 2019

    IS THIS RIGHT? Name the following binary acids: HF(aq) – Hydrofluoric Acid HCl (aq)– Hydrochloric Acaid H2Se(aq) – Hydroselenide Acid HBr(aq) – Hydrobromic Acid HI (aq)– Hydroiodic Acid H2Te (aq)- hydrotelluric acid

    asked on September 29, 2015
  59. History

    1) How was Nixon appeal to Middle America a strategized? a) He tried aggressively to gain the majority of his support for protesters and aimed his campaigns towards them. b) He highlighted the salient issues that plagued and concerned many less outspoken

    asked on May 13, 2015
  60. science

    Why might a plastic rod that contains a large number of electrons not have a static charge?

    asked on January 3, 2010
  61. math

    A ball is shot straight up into the air with initial velocity of 45 ft/sec. Assuming that the air resistance can be ignored, how high does it go?

    asked on October 4, 2010
  62. Math

    The owner of the Good Deals Store opens a new store across town. For the new store, the owner estimates that, during business hours, an average of 90 shoppers per hour enter the store and each of them stays an average of 12 minutes. The average number of

    asked on September 28, 2018
  63. Chemistry

    The molar enthalpy of vaporization for water is 40.79 kJ/mol. Express this enthalpy of vaporization in joules per gram.

    asked on November 20, 2012
  64. chemistry

    what is the name for the compound Al2I3??

    asked on October 26, 2010
  65. History

    which term suits this sentence: --------- often led to corruption, as some officeholders helped themselves to public money. Fill in the blank with one of these terms: labor unions, Grover Cleveland, Patronage, Chester Arthur, wealthy men, or James Garfield

    asked on January 21, 2013
  66. AP Chemistry

    A 0.250 M NaOH solution was used to titrate a 19.75 mL HI solution. The endpoint was reached after 32.95 mL of titrant were delivered. Find the molar concentration of HI in the original solution.

    asked on February 4, 2018
  67. math

    1. A flywheel is rotating at 7 rad/sec. It has a 15-cm diameter. What is the speed of a point on its rim, in cm/min? 2. A wheel is rotating at 3 radians/sec. The wheel has a 30 cm radius. What is the speed of a point on its rim, in m/min? 3. What is the

    asked on January 9, 2019
  68. 11Biology

    What are the gametes formed by the following squash plants, the genotypes of which for fruit colour and shape given; and what will be the appearance of the offspring from each cross? WWdd x wwDD WwDD x wwdd WwDd x WwDD WwDd x Wwdd WwDd x wwdd WwDd x WwDd

    asked on March 1, 2012
  69. English

    What is the universal truth in "Oedipus the King"?

    asked on February 20, 2012
  70. Medical

    Can some one please tell me all the: adjectives adverbs conjunctions nouns prepositions pronouns verbs - in this paragraph? please! Thank you. The patient was brought to the operating room and Bier block anesthesia was performed. The right upper extremity

    asked on February 2, 2015
  71. math

    1.A flywheel is rotating at 7 rad/sec. It has a 15-cm diameter. What is the speed of a point on its rim, in cm/min? 2.A wheel is rotating at 3 radians/sec. The wheel has a 30 cm radius. What is the speed of a point on its rim, in m/min? 3.What is the

    asked on January 14, 2019
  72. Chemistry

    How much heat energy, in kilojoules, is required to convert 63.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?

    asked on January 26, 2014
  73. Algebra

    I have a few questions on my Pre- Algebra Pre- test. I am in 7th grade. Anyone willing to help me for a few questions for 5-10 minutes?

    asked on June 7, 2015
  74. Functions

    What is the purpose of division of polynomials?

    asked on October 13, 2011
  75. Physics-mechanics

    Find the speed and period of a satellite that orbits Mars 175 km above it's surface. (The average radius of Mars is 3.40 x 10^6; and it's mass is 6.42 x 10^23. Use all necessary formulas and show all clear-working, to enable me understand how you arrived

    asked on December 27, 2012
  76. AP Chemistry

    A 0.2500 M NaOH solution was used to titrate a 16.85 mL hydrofluoric acid solution. The endpoint was reached after 31.20mL of titrant were added. Find the molar concentration of hydrofluoric acid in the original solution.

    asked on February 4, 2018
  77. AP Chemistry

    A 0.500 M HNO3 solution was used to titrate a 21.15 mL KOH solution. The endpoint was reached after 22.30 mL of titrant were delivered. Find the molar concentration of KOH in the original solution.

    asked on February 4, 2018
  78. math

    a student in Greece discovers a poetry bowl that contains 28% of its original amount of c-14

    asked on March 10, 2015
  79. Biology HELP

    How would the production of gelatinase help a pathogen be more virulent?

    asked on April 7, 2013
  80. Statistics

    assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation of 15 find the probability that a randomly selected adult has an IQ between 89 and 121 ?

    asked on December 12, 2012
  81. Physics

    Help with this please. No idea. Except for a 22.00 min. rest stop, Emily drives with a constant velocity of 89.5 km/hr north. How long does the trip take if Emily's average velocity is 77.8 km/hr north?

    asked on August 13, 2017
  82. Algebra

    At a concession stand, three hot dogs and four hamburgers cost $12.00; four hot dogs and three hamburgers cost $10.75. Find the cost of one hot dog and the cost of one hamburger.

    asked on August 14, 2016
  83. Chemistry

    Based on the cell reaction: Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 55.0g of copper is plated out? Wmax=______ J

    asked on April 14, 2014
  84. World Civilization

    1. In 1789, the National Assembly revoked the privileges of the aristocracy. This occurred in reaction to A. a peasant uprising. B. Louis XVI's withdrawal of troops from Paris. C. discontent among the poor people of Paris. D. the storming of the Bastille

    asked on April 11, 2014
  85. Physics

    A 1.0kg mass weighs 9.8 Newton on earth's surface, and the radius of Earth is roughly 6.4 x 10 to the power of 6. The mass of the earth is 6.02 x 10 to the power of 24. Calculate the average density of Earth?

    asked on December 24, 2012
  86. poetry

    in the poem the legend by garrett hongo what is the aullusion at the end of the poem in stanza 4? Need Answer ASAP!!

    asked on June 6, 2012
  87. 9geography

    Lowland Regions of Canada How was the bedrock of the lowlands formed? How thick is the bedrock in the interior plains and why is it so thick? Why are the ancient coral reefs of the interior plains important today? Describe the topography of the interior

    asked on March 29, 2010
  88. Statistics

    The mean television viewing time for Americans is 15 hours per week. Suppose a sample of 60 Americans is taken to further investigate viewing habits. Assume the population standard deviation for weekly viewing ime is o = 4 hours. A What is the probability

    asked on October 30, 2007
  89. Physics

    In a car crash, Car A rear ends Car B that stopped at a red light. After the crash, Car A and Car B meld together moving at a speed of 14 m/s. Car A has a mass of 1750 kg. Car B has a mass of 2000 kg. Calculate the initial momentum of Car A. So far I have

    asked on November 30, 2015
  90. 11Science

    How many genetically different gametes can be produced from a diploid cell with seven chromosome pairs?

    asked on February 15, 2012
  91. physics

    two blocks of each mass m=3.75kg are fastened to the ceiling of an elevator. If the elevator accelerates upward at 1.6m/s^2. Find the tension in T1 and T2 in each upper and lower rope

    asked on March 11, 2015
  92. chem

    What is the pH of 1.00 L of the buffer solution that contains 0.100 M HF and 0.120 M NaF after 0.020 mol of HNO3 is added? The Ka of HF is 3.5×10−4, and so pKa = 3.46.

    asked on November 11, 2013
  93. Astronomy

    The average distance between the Earth and the Sun is called the astronomical unit (AU), which is about 150 million km (1.5 x 108 km). Jupiter is 780 million km from the sun. a) How far is Jupiter from the sun in astronomical units (AU)? b) Based on your

    asked on October 2, 2011
  94. Biology

    List 2 local biomes communities found in Nigeria

    asked on January 18, 2019
  95. AP Chemistry

    A 30.75 mL sample of 0.450 MKOH was titration with an unknown concentration of HCl. The endpoint was reached when 29.35 mL of NaOH were delivered. Find the concentration of the titrant

    asked on February 4, 2018
  96. Mathematics

    Tom deposits $800 into an account that pays simple interest at a rate of 2℅ per year. How much interest will he be paid in the first 2 years

    asked on December 5, 2016
  97. Physics

    A skier with a mass of 66.6 kg starts from rest and skis down an icy (frictionless) slope that has a length of 58.4 m at an angle of 29.8° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow

    asked on September 27, 2012
  98. math

    What length of fencing is required to surround a square field with area 250 m2? Show your work. Give your answer to the nearest cm. How would i do this???plz help, thx!! :D

    asked on April 13, 2009
  99. Physics

    A phonograph record initially moving at 33 1/3 rpm accelerates uniformly to 45 rpm in 2.5 s. What is the angular distance traveled by the record during this time?

    asked on December 1, 2011
  100. History

    Why did Ho Chi Minh lead a resistance against France? a) He sought Vietnam’s independence. b) He wanted to control the country. c) He wanted more foreign influence and control other than France. d) He desired to keep French rulers in the Vietnam but

    asked on May 12, 2015


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