Most popular questions and responses by Grace
  1. Statistics

    Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three

    asked on March 17, 2013
  2. Science

    1.If an animal is an ectotherm, It has? A. A skeleton on the outside of its body B. A skeleton on the inside of its body C. A body that regulates its own internal temperature D. A body that does not produce much internal heat

    asked on December 31, 2017
  3. Chemistry

    FeSCN2+ -> Fe3+ + SCN- Solution is initially dark red. If some Ag+ is added to form AgSCN. what happens to position of equilibrium? what happens ot the color?

    asked on February 8, 2011
  4. Trigonometry

    How do I find all solutions to: tanx+3cotx=4? The answer choices are: a.) x=arctan3+nPi b.) x=arccot3+nPi

    asked on January 1, 2010
  5. Chem

    Write the formulas of the compounds formed by Pb4+ with the following anions: CN−, ClO3−, SO42−, H2PO4−.

    asked on March 4, 2016
  6. Physics

    Two cars travel westward along a straight highway, one at a constant velocity of 85 km/hr, and the other at a constant velocity of 115 km/hr. a) Sketch the velocity vs. time graph for both cars and paste your sketch in the space below. b) Assuming both

    asked on October 24, 2010
  7. math

    Given: ∆PQR, m∠R = 90° m∠PQR = 75° M ∈ PR , MP = 18 m∠MQR = 60° Find: RQ

    asked on March 14, 2017
  8. Chemistry

    Write a balanced chemical equation that represents the self-ionization of water. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25°C in your answer.)

    asked on April 2, 2014
  9. Statistics

    A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is

    asked on March 22, 2013
  10. Language Arts

    What does the aunt in The Story Teller find improper about the bachelor's story? A. It makes fun of Bertha's goodness B. It has too many fantasy elements C. It unrealistically suggests that virtue is always rewarded D. The bachelor tells it without

    asked on September 29, 2015
  11. Math

    You flip a coin 30 times and get heads 11 times, so the chance of getting heads is 11\30. Is this an example of theoretical or experimental probability? A. Theoretical B. Experimental Is the answer B? Thank you

    asked on April 9, 2015
  12. Chemistry

    An AM station broadcasts rock music at "950 on your radio dial" Units for AM frequencies are given in kilhertz(kHz). Find the wavelength of the station's radio waves in meters, nanometers, and angstroms.

    asked on September 7, 2011
  13. Science please check my answer

    Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body? A) A mold B) A petrified fossil*** C) A cast D) A trace fossil

    asked on September 29, 2015
  14. Physics

    You're driving parallel to train tracks at 40.0 km/h when a train passes you, going a steady 105 km/h. A track crossing is up ahead, so you begin to speed up at 6.50 m/s2. How far do you drive before you pass the train?

    asked on October 2, 2016
  15. world history

    What was a major cause for the Third Italian War of Independence? the border disputes with France and later with Prussia the simultaneous attack of Austria by Prussia and Italy in 1866 the desire to create a vast Italian empire in central Europe C?

    asked on February 11, 2019
  16. history

    Which options describe Chinese developments in mathematics? (Select all that apply.) A- The first Chinese book about mathematics, Nine Chapters on the Mathematical Art, was composed before 200 BC. B- The Chinese discovered the ratio of a circle’s

    asked on November 16, 2018
  17. chemistry

    a 2.52-g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.23 g of CO2 and 1.01 g of H2O as the only carbon and hydrogen containing products respectively. Another sample of the same

    asked on February 15, 2014
  18. Operations Management

    Consider the following system: -> 0.73 -> 0.73 -> Determine the probability that the system will operate under each of these conditions: (Round your final answers to 4 decimal places, not your intermediate calculations.) a.) The system as shown b.) Each

    asked on March 6, 2016
  19. Chemistry

    What is the Wavelength( in nm) of the least energetic spectral line in the infrared series of the H atom? I don't understand how to find the least energetic spectral line?

    asked on September 10, 2011
  20. history

    Which best describes how Sparta’s culture influenced the city-state’s government? A- Sparta was a society based on exploration and expansion, and its government was also based on this concept. B- Sparta was a society based on being prepared for war,

    asked on November 16, 2018
  21. Help! Communication

    HELP!!! effective verbal message formation is about being. 1) Supportive of others 2) Critical of the motives of others 3) informed about a decision process 4) intentional in one's learning. I think the answer is 2 but i'm not sure.

    asked on October 14, 2017
  22. history

    explain the relationship of Spindletop's location in Texas to it's importance on the economic development of Texas and the United States.

    asked on October 5, 2016
  23. Biochemistry

    Calculate the ph of a 1L solution to wgich has been added 25ml of 10mM acetic acid and 25ml of 30mM sodium acetate

    asked on July 23, 2017
  24. Physics

    A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward. What is the coefficient of static friction between the crate and the ramp? At what angle does the

    asked on February 22, 2010
  25. Math #rd grade

    Bryan has 3 nickels, 3 dimes, and 2 quarters. What fraction of the coins is either a dime or a quarter? There is a space for only 1 fraction answer.

    asked on January 14, 2014
  26. Physics

    A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each

    asked on January 28, 2016
  27. History

    What was the importance of the inclusion of the bill of rights in the constitution? a.It limited the power and controls the government b.It guaranteed the protection of basic rights improve U.S relations with the british monarchy proposed a

    asked on September 15, 2017
  28. math

    Water is being poured into a conical cup that is 12cm tall. a) When the water in the cup is 9cm deep, what percentage of the cup is filled? b) When the cup is 75 percent filled, how deep is the water?

    asked on April 9, 2017
  29. Language Arts

    What does the word conviction mean in this sentence? His voice rang with great conviction as he told us his ideas. A)Anger B)Certainty C)Confusion D)Sorrow

    asked on September 25, 2015
  30. Chemistry

    In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery. Fe(s) + 2 NiO(OH)(s) + 2 H2O(l) Fe(OH)2(s) + 2 Ni(OH)2(aq) How many mole of Fe(OH)2, is produced when 3.70 mol Fe and 6.95 mol NiO(OH) react?

    asked on February 24, 2014
  31. math

    Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

    asked on February 8, 2017
  32. Math

    Suppose you write the letters M-I-S-S-I-S-S-I-P-P-I on cards and mix them in a hat. You choose one card from the hat without looking. What is the probability of picking an S? A.4\11 B.2\11 C.4\7 D.7\4 Is the answer A? Thank you

    asked on April 9, 2015
  33. Math

    You roll a pair of number cubes and then flip a coin. Is this an example of independent or dependent events? A. Independent B. Dependent Is the answer A? Thank you

    asked on April 9, 2015
  34. Physics

    A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the

    asked on December 15, 2016
  35. social studies

    1. Many agree that Native Americans migrated from Asia as early as _______ years ago. (1 point) 2,000 5,000* 30,000 100,000 2. What country controlled the majority of the Americas in 1783? (1 point) Great Britain* France Spain Native American 3. The Treaty

    asked on February 16, 2016
  36. chemistry

    1.How many atoms are in a sample of copper with a mass of 18.46 grams? 2.How many formula units are in a sample of salt with a mass of 67.69 grams? 3.How many molecules are in a sample of water with a mass of 44.99 grams? 4.What is the mass in grams of

    asked on February 6, 2011
  37. Geography

    Which scenario accurately depicts a way that maps are used as a reference tool? A. A shopper consults a map to discern the best route to a new store. B. A teacher displays a map to point out the name of a local mountain. C. A student consults a map to

    asked on August 30, 2019
  38. Computer Science

    The compare_and_swap() instruction (CAS) can be used to design lock-free data structures such as stacks, queues, and lists. The program example shown below presents a possible solution to a lock-free stack using CAS instructions, where the stack is

    asked on March 20, 2019
  39. chemistry

    8.What is the mass of 4.56 moles of sulfur dioxide? 9.What is the mass of 4.56 molecules of sulfur dioxide? 10.How many formula units are in 0.456 grams of Ca3(PO4)2? 11.How many moles are in 1.5 x 10 ^23 atoms of fluorine? 12.What is the mass of 2.80 x 10

    asked on February 6, 2011
  40. Geometry

    The coordinates of the vertices of △ABC are A(1,4), B(-2,-1), and C(-3,-2). The height h to side BC is √2, and b is the length of BC. What is the area of △ABC? I don't really know how to approach or start this problem, so if you can help, please do!

    asked on September 30, 2019
  41. riddle

    Its new and old at the same time

    asked on January 17, 2017
  42. Math

    Suppose you write the letters M-I-S-S-I-S-S-I-P-P-I on cards and mix them in a hat. You choose one card from the hat without looking. What is the probability of picking a P? A.4\11 B.2\11 C.4\7 D.7\4 Is the answer B? Thank you

    asked on April 9, 2015
  43. math

    how is finding a fractional part of a set different than finding a fractional part of a whole?

    asked on January 7, 2015
  44. maths

    The mass of a particular substance is known to grow exponentially at a rate of 0.5% per hour. Its initial mass was 25 grams and, after t hours, it weighed 31 grams. The equation modelling this growth is 25×1.005 t  =  31. Use the method of

    asked on May 8, 2011
  45. Physics

    A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

    asked on October 17, 2016
  46. math

    Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have? 13 apples 8-3=5 green 8+5=13

    asked on January 25, 2017
  47. Chemistry

    Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. a) The C---O bond absorbs radiation of wavelength 9.6um. What frequency (in s-1) corresponds to that wavelength? b) The H---Cl bond has a frequency of

    asked on September 8, 2011

    The specific heat capacity (cp) of lead is 0.13 J/g °C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 °C to 37 °C? a. 2.0 b. -0.13 c. 0.13 d. 29

    asked on May 9, 2010
  49. Science

    What has the study of fossils allowed scientists to do? A) Describe the past environments and the history of life. B) Study present ocean temperatures at different depths C) Analyze the chemical compositions of sedimentary rocks and minerals. *** D)

    asked on September 29, 2015
  50. Chemistry

    Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.

    asked on February 25, 2014
  51. Math

    A lighthouse is east of a Coast Guard patrol boat. The Coast Guard station is 20 km north of the lighthouse. The radar officer aboard the boat measures the angle between the lighthouse and the station to be 23°. How far is the boat from the station?

    asked on May 8, 2013
  52. math

    third degree with zeros of 2-i,2+i and 2 and a leading coefficient of 4. Construct a polynomial function with stated properties

    asked on October 28, 2017
  53. chemistry

    when aqueous solutions of copper II nitrate and sodium phosphate are mixed, sodium nitrate and copper II phosphate are formed. In the balanced chemical equation what is the coefficient of sodium nitrate?

    asked on May 6, 2010
  54. physics

    Two large horizontal metal plates are separated by 4mm. The lower plate is at a potential of (-)6v.What potential should be applied to the upper plate to create field strength of 4000v/m upwards in the space between the

    asked on August 28, 2013
  55. math

    A certain store is selling an $80 radio $64. If a different radio had a list price of $200 and was discounted at 1.5 times the percent discount on the $80 model, what would its selling price be? a) $90 b) $105 c) $120 d) $140 e) $160

    asked on August 2, 2012
  56. Physics

    An engineer is designing a runway for an airport. Several planes will use the runway and the engineer must design it so that it is long enough for the largest planes to become airborne before the runway ends. The largest plane accelerates at 3.30 m/s2 and

    asked on October 23, 2010
  57. Chemistry

    How do I do the empirical formula for 37.01% carbon, 2.22% hydrogen, 18.50% nitrogen, and 42.27% oxygen? My teacher gave me the answer (C7H5N3O6), but I can never get that answer.

    asked on December 5, 2014
  58. Physics

    A person runs off a 10.0-meter high balcony in a horizontal direction at 5.0 m/s. The swimming pool is at ground level 5.5 meters away from the edge of the balcony. Will the person reach the pool? Assume no air resistance. *I'm having trouble with this

    asked on April 5, 2017
  59. Physics

    Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat

    asked on February 17, 2017
  60. science

    which of the following does not change when a car keeps a constant speed but changes direction

    asked on April 28, 2016
  61. algebra

    The ordered pairs (1, 81), (2, 100), (3, 121), (4, 144), and (5, 169) represent a function. What is a rule that represents this function?

    asked on April 10, 2017
  62. MATH

    A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents.If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval of the true mean.

    asked on April 16, 2015
  63. Math

    You have made 3 out of 10 of your last free throws. How many free throws can you expect to make if you shoot 100 free throws? A.30 B.50 C.60 D.75 Is the answer A? Thank you

    asked on April 9, 2015
  64. physics

    If the grating is not properly aligned, what are the consequences on the average angular displacement and wvelength reading? Please elaborate. How do grating constants affect the observed spectral lines?

    asked on January 18, 2009
  65. Math - for Reiny

    Mandy finds she can get a discount on corn cobs if she buys in bulk. She can get 100 kilograms of corn cobs for $160 from Matt, on condition that she buys at least 100 kilograms. From another supplier, Robert, she can buy small quantities of corn cobs (100

    asked on June 2, 2019
  66. Languagd Arts

    Which of the following is the best reason to use visuals in a research presentation? A. To illustrate your main point in an engaging manner. B. To illustrate any topic with data in percentages. C. To show different ways of looking at the same information.

    asked on April 10, 2015
  67. Differential calculus

    A gutter with trapezoidal cross section is to be made from a long sheet of tin 8 in wide by turning up one third of its width on each side , what width a cross the top that will give a maximum capacity

    asked on August 23, 2015
  68. Chemistry

    When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

    asked on February 24, 2014
  69. Science

    Does anyone know why does climate/water movement cause some parts of the ocean to be saltier than others? I'm stuck. Are there multiple ways?

    asked on April 3, 2019
  70. St paul's university

    A sample of 200 voters revealed the following about the three candidates A,B and C.28 were in favour of both A and B.98 in favour of A or B but not C.42 in favour of B but not C or A.122 in favour of B or C but not A.64 in favour of C but not A or B.14 in

    asked on July 4, 2015
  71. Physics

    Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic

    asked on October 20, 2016
  72. math

    What is the volume of the cone in the picture if S = 5 and R = 3?

    asked on March 6, 2016
  73. Math

    There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test? ****** This is how I slove the

    asked on March 1, 2012
  74. Science (Chemistry)

    2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm^3. Show all calculations leading to an answer. (I think I

    asked on March 9, 2015
  75. Math

    By letting x=5^y, show that the equation p5^y + 5^-y = 5 can also be written as px^2-5x+1 = 0

    asked on February 9, 2017
  76. chemistry

    Why is it necessary to wait until the filter paper containing a compound is completely dry before weighing it? and how would it effect the theoretical yield? HIgher?? lower??

    asked on May 6, 2010
  77. Physics

    Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What

    asked on February 22, 2017
  78. math

    Later 7 students joined group 2 (41 students)and one student left to join group 1. (44 students) Now 20 students play trombone and 7 more students play trumpet as play saxophone. How many students play each instrument?

    asked on November 4, 2015
  79. Chemistry

    Suppose a saturated solution of barium fluoride contains 1.5 x 10 ^ -2 M of F-. What is the Ksp of BaF2. I know that the balanced equation of this reaction is: BaF2 (s) --> Ba2+ (aq) + 2F- (aq) There is a 1:1 ratio between BaF2 and Ba2+ and there is a 1:2

    asked on March 31, 2016
  80. Language Arts

    What is the most important reason for using multiple sources in a research presentation? A. So you include primary and secondary sources. B. So you have experience conducting original research. C. So you know that the information is accurate. D. So you use

    asked on April 10, 2015
  81. algebra

    TGIF. Chris and Terry have been trying to live within their budget but miss going out to dinner on Friday nights. They decide not to spend any nickels or quarters they receive as change for a month and save these in a jar. At the end of the second week

    asked on July 17, 2011
  82. AP Human Geography

    Without a scale on a map, A. many details must be omitted. B. only global trends can be captured. C. regional details can be captured, but larger details must be omitted. D. viewers cannot tell how much area on Earth is represented on the map. E. viewers

    asked on August 29, 2019
  83. Physics

    A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs

    asked on February 24, 2013

    The major component of vinegar is acetic acid CH3COOH. Which of the following reactions represents the balanced equation between acetic acid and sodium bicarbonate? a. CH3COOH(aq) + NaHCO3 a CH3COONa(aq) + CO2(g) + H2O(I) b. CH3COOH(aq) + 2 NaHCO3(aq) +

    asked on May 9, 2010
  85. Geometry

    What is the scale factor of a dilation centered at the origin that maps the point (12, -8) to the point (-7.2, 4.8)? Please show work as it will help me better understand, thanks so much!

    asked on September 30, 2019
  86. Physics

    A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

    asked on September 29, 2016
  87. Math

    While mixing a light green paint, Luke mixes 35% blue paint and the rest is yellow. The green paint fills up two fifths of a litre container. Still thinking it needs to be a lighter green how much more yellow paint must be added to make the yellow paint

    asked on May 24, 2019
  88. Math

    What is the Distributive Property?

    asked on October 12, 2015
  89. Chemistry

    What are the molality and mole fraction of solute in a 32.3 percent by mass aqueous solution of methanol (CH3OH)? molality = ?m mole fraction =

    asked on March 13, 2014
  90. Science (Chemistry)

    The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!

    asked on June 13, 2011
  91. Geometry

    If AD=27, AC=2x, BC=3, and BD=x, what is x?

    asked on September 29, 2019
  92. Physics...Help!!!

    given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.

    asked on December 20, 2012
  93. math

    al has twice as many baseball cards as frank and four times as many football cards as joe. the expression 2x+4y can be used to show the total number of baseball and football cards Al has. If the answer is y, then what is the question?

    asked on August 17, 2012
  94. physics

    A proton moves at a speed of 5.9 × 107 m/s at right angles to a magnetic field with a magnitude of 0.095 T. Find the magnitude of the acceleration of the proton. Answer in units of m/s 2 .

    asked on May 6, 2019
  95. Math help ❤️

    An angel measures 53°. What are the measures of the angles comp meant and supplement? A) Comlement, 37°; supplement, 137° B) Complement, 127°; supplement, 47° C) Complement, 37°; supplement, 127° D) Complement, 127°; supplement, 37° Please help me

    asked on March 1, 2019
  96. Social Studies

    What was the Peloponnesian war? Please check my answer :) A) A conflict between Greece and Persia B) A conflict between Athens and Sparta (my answer) C) A conflict between Greece and Macedonia D) A conflict between Macedonia and Athens Please help me my

    asked on February 18, 2019
  97. Math

    Biruk wants to buy a book for $15.25 and a book for $4.85. He wants to pay with one $20.00 bill. Use estimation to decide whether this is reasonable or not. Explain what place value to round for an estimate this is useful in this situation.

    asked on October 12, 2015

    The specific heat capacity (cp) of lead is 0.13 J/g °C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 °C to 37 °C? a. 2.0 b. -0.13 c. 0.13 d. 29

    asked on May 9, 2010
  99. physics

    An electron in a vacuum is first accelerated by a voltage of 15600 V and then enters a region in which there is a uniform magnetic field of 0.689 T at right angles to the direction of the electron’s motion. What is the force on the electron due to the

    asked on May 6, 2019
  100. math

    Suburban Population. The following charts show the populations for two suburbs from 1980 to 1990, where x = 0 correspond to 1980, x = 2 correspond to 1982, and so on. Year x Suburb 1 y Year x Suburb 2 y 0 12,690 0 23,112 2 12,071 2 23,893 4 13,463 4 24,674

    asked on July 17, 2011


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