Popular questions and responses by Jill
  1. chem

    3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming 100% yield? is it 3 moles? I don't want to work through the details of this problem completely. Tell me what you don't understand

    asked on July 17, 2007
  2. Chemistry

    A technician mixes a solution containing silver nitrate with a solution containing sodium chromate. 2.89 g of precipitate is produced (assume silver chromate). Calculate the mass of silver nitrate present in the first solution. Make sure you have the

    asked on July 27, 2015
  3. Physics

    Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves upward after it is released?

    asked on June 30, 2013
  4. statistics

    A large number of applicants for admission to graduate study in business are given an aptitude test with a resulting mean score of 460 with a standard deviation of 80. The top 2.5 percent of the applicants would have a score of at what? A. 606 B. 617 C.

    asked on April 11, 2014
  5. Physics

    The portion of string between the bridge and upper end of the fingerboard (the part of the string that is free to vibrate) of a certain musical instrument is 60.0 cm long [.6m] and has a mass of 2.23 g [.00223kg]. The string sounds an A4 note (440 Hz) when

    asked on November 19, 2007
  6. Statistics

    The Graduate Record Examination (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: 1. Draw a rough sketch,

    asked on September 22, 2014
  7. Math, please help

    Which of the following are trigonometric identities? (Can be more then one answer) tanx cosx cscx = 1 secx-cosx/secs=sin^2x 1-tanxtany=cos(x+y)/cosxcosy 4cosx sinx = 2cosx + 1 - 2sinx Find all solutions to the equation cosx cos(3x) - sinx sin(3x) = 0 on

    asked on January 14, 2014
  8. math

    Find the product of (2a + 3b)(2a − 3b). A. 4a2 − 6b2 B. 2a2 − 3b2 C. 4a2 + 12ab − 9b2 D. 4a2 − 9b2 plz help

    asked on May 14, 2015
  9. Microeconomics

    Correcting for negative externalities - Regulation versus tradablepermits Suppose the government wants to reduce the total pollution emitted by three local firms. Currently, each firm is creating 4 units of pollution in the area, for a total of 12

    asked on May 29, 2014
  10. physics

    A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which the book will remain

    asked on September 24, 2014
  11. chemistry

    Barium carbonate and nitric acid: BaCO3 (s) + 2HNO3 (aq.) --> Ba2+ (aq.) + 2(NO3-) (aq.) + CO2 (g) + H2O (l) If 25.0mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?

    asked on July 2, 2013
  12. geometry

    A 24 foot ladder forms a 76 degree angle with the ground. The top of the ladder rests against the building. To the nearest inch how high up the building does the ladder reach?

    asked on February 20, 2012
  13. AP Biology- Molecular Genetics

    The correct sequence between genes and their phenotypic expression is a) RNA-DNA-protein-trait b) DNA-RNA-protein-trait c) Protein-DNA-RNA-trait d) trait-DNA-RNA-protein I think it is either b or d but do not know if the trait is at the beginnig or end...

    asked on March 14, 2011
  14. geometry

    the area of a triangle is 27 square feet. its height is three times the length of its base. find the height and base of the triangle. i am unsure of how to set it up, please help

    asked on August 19, 2016
  15. math

    What is the height of a triangle whose base is 9.4 centimeters and whose area is 132.54 square centimeters?

    asked on March 22, 2011
  16. physics

    on the surface of earth, a spacecraft has a mass of 2.00x10^4 kilograms. What is the mass of the spacecraft at a distance of one earth radius above earths surface?

    asked on January 16, 2011
  17. 5th grade math

    What fraction of a square mile is a field that is 1/2 mile long and 1/4 mile wide? How do you figure this?

    asked on January 27, 2010
  18. Physics

    The intensity of sunlight reaching the earth is 1360 W/m^2 Part A: Assuming all the sunlight is absorbed, what is the radiation-pressure force on the earth? Give your answer in newtons. Part B: Give your answer as a percentage of the sun's gravitational

    asked on April 24, 2008
  19. geometry

    Constructing Perpendicular Lines same as last time, i need an exact example of these instructions, if someone could share it with me, it would be greatly appreciated Draw a line and a point on the line. Label the point K. With the point end of the compass

    asked on June 11, 2018
  20. Algebra

    Points A(3,5) and B(7,10) are the endpoints of a diameter of a circle graphed in a coordinate plane. How many square units are in the area of the circle? Express your answer in terms of pi.

    asked on December 18, 2014
  21. Triggggggg

    A ship is 90 miles south and 20 miles east of port. The captain wants to travel directly to port. What bearing should be taken?

    asked on April 28, 2011
  22. Chemistry

    Assuming that temperature remains constant, calculate the final volume Pressure of a sample of 45 L of gas is increased and the gas goes from 100 kPa to 125 kPa;

    asked on April 6, 2011
  23. precal

    Find f(x) and g(x) such that h(x)=(fog)(x) h(x)=x^2-9 / x^2+9

    asked on January 24, 2020
  24. Math

    When two-fifths of a number is increased by 15 the result is 27. What is the number?

    asked on May 29, 2016
  25. physics

    A flatbed truck is supported by its four drive wheels, and is moving with an acceleration of 7.4 m/s2. For what value of the coefficient of static friction between the truck bed and a cabinet will the cabinet slip along the bed surface?

    asked on September 24, 2014
  26. Geometry

    A rectangle napkin costs $3.25. A similar tablecloth is five times longer and five times wider. How much would you expect to pay for the table cloth? $81.25 $48.74 $16.25 $32.50

    asked on April 15, 2012
  27. 5th math

    If a spinner is divided into 8 congruent sectors what is the sample space ? there a 2 1's, 2's. 3's and 4's that make up the segments

    asked on January 17, 2011
  28. 5th grade math

    how many square feet are needed to cover one square yard? would it be 108 sq ft also would .26 rounded to the nearest hundredth be .30

    asked on January 17, 2011
  29. Math

    Two dice are rolled. Find the odds that the score on the dice is either 7 or 12

    asked on December 6, 2009
  30. calc

    a) A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 40 ft/s^2. What is the distance covered before the car comes to a stop? b) A car braked with a constant deceleration of 40 ft/s^2 and produced skid

    asked on November 22, 2009
  31. science

    If air at sea level with a temperature of 27degrees C is forced up a mountain slope and the air's dew point at the condensation level is 14degrees C, at what elevation will condensation begin?

    asked on June 6, 2009
  32. precal

    how do you solve log (x+9) = 1 - log x

    asked on March 10, 2020
  33. pre-calculus

    the profit of a company, in dollars, is the difference between the company's revenue and cost. the cost C(x), and R(x) are functions for a particular company. the x represents the number of items produced and sold to distributors. C(x)=2000+60x

    asked on January 28, 2020
  34. precal

    factor by grouping 5x^3-x^2-45x-9=0

    asked on January 26, 2020
  35. MATHS HELP URGENT.pleasee

    The area of a triangle ABC is 126 sq.cm. AC=13 cm , BC = 21 cm, what is the length of AB? where, triangle ABC is a scalene triangle

    asked on January 6, 2016
  36. geometry

    In quadrilateral QRTS, we have QR = 11, QS = 9, and ST=2. Sides line RQ and line ST are extended past Q and S, respectively, to meet at point P. If PS = 8 and PQ = 5, then what is RT?

    asked on March 26, 2015
  37. Chemistry

    What amount of energy is required to melt a 27.4 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice 9.12e3 = J What amount of energy must be removed from 123 g of water to cool it from 71.6oC to 9.41oC? Specific heat

    asked on October 2, 2014
  38. math

    amamda is 12 years old. she is 2/7 times as old as her father. how many years ago was her father 4 times as old as amanda?

    asked on February 6, 2014
  39. algerbra

    Keisha read twice as many books this year as ben read. subtracting 4 from the number of books Keisha read and dividing by 2 gives the number of books Sheldon read. Sheldon read 10 books. How many books did Ben read?

    asked on November 4, 2013
  40. Chemistry

    Explain clearly which out of the following combinations of solutes would result in the formation of a buffer solution? A) NH3 and HCl in a 2:1 molar ratio B) HCl and NaOH in a 1:2 molar ratio C) NH3 and NH4Cl in a 2:1 molar ratio D) NaOH and CH3COOH in a

    asked on April 1, 2013
  41. Chemistry

    what is the pH of a solution prepared by adding 0.259g of ammonium chloride to 115mL of water? Kb of NH3 is 1.8x10^-5

    asked on March 22, 2013
  42. Biology

    What does Rf, (or relative to front) mean?

    asked on April 4, 2012
  43. Bio please help!

    What is a vital process performed by proteins embedded in cell membranes?

    asked on February 29, 2012
  44. math

    mount everset is 29,029 feet above sea level. How many yards above sea level is Mount Everest? Would I divide 29,029 by 3? 9,976 feet above sea level Would this be correct? Thank You.

    asked on November 3, 2010
  45. literary

    Hi, I don't seem to understand Stephen King's "Why we crave horror movies" Give three examples of figurative language (in this case, a metapor) King uses. For each, explain what two things are being compared and state why you think this is an effective

    asked on September 9, 2010
  46. english

    unscrabble ttrocpe rahdocr http://www.ssynth.co.uk/~gay/anagram.html http://wordsmith.org/anagram/ http://www.unscramble.net

    asked on April 30, 2007
  47. geometry

    Do you use the formula: (n-2)180 / n to find the measure of each arc that corresponds to a side of a polygon? Example: a hexagon (6-2))180/6 = 120 ?

    asked on March 10, 2017
  48. geometry

    when do you use the following formula: (n-2)180 divided by n

    asked on March 10, 2017
  49. statistics

    10th grade New York public school students taking a standardized English test produced test scores that were normally distributed with a mean of 85 and a standard deviation of 4. Let x be a random variable that represents the test score of a student.

    asked on December 4, 2016
  50. Math

    Find the volume of a sphere with radius 9 yd. A. 3,829.7 yd3 B. 3,052.1 yd3 C. 381.5 yd3 D. 339.1 yd3 the answer is B=3052.1

    asked on March 17, 2016
  51. math

    Nancy drove 110 km using 13.5 liters of gas. What was her gas mileage in miles per gallon? A. 3.47 B. 68.2 C. 19.14 D. 20 The answer is D=20 gallons

    asked on March 17, 2016
  52. trigonometry

    graph y=-3sec(2x-pi/3)proved the period vertical translation and the phase shift

    asked on July 22, 2014
  53. math

    A choir is singing at a festival. On the first night 12 choir members were absent,so the choir stood in 5 equal rows. On the second night only one member was absent, so they stood in 6 equal rows. the same number of people stood in each row each night. How

    asked on January 14, 2014
  54. Physics

    A car starts rolling down a l-in-4 hill (l-in-4 means that for each 4 m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling 55 m? (a) Ignore friction, (b) Assume an effective coefficient of

    asked on November 3, 2013
  55. chemistry

    Calcium oxide and carbon are reacted to produce carbon monoxide and calcium carbide CaC2. When one mole of calcium carbide is formed, 464.8kJ is absorbed. How many grams of carbon are used up when 20.00kJ of heat is absorbed?

    asked on June 22, 2013
  56. chemistry

    Calcium oxide and carbon are reacted to produce carbon monoxide and calcium carbide CaC2. When one mole of calcium carbide is formed, 464.8kJ is absorbed. What is the enthlapy of reaction when 1.00g of calcium carbide is formed?

    asked on June 22, 2013
  57. chemistry

    Which of the following os a true statement about the periodic table? A. periods form horizonal rows;groups form vertical columns B. groups form horizontal rows;periods form vertical columns C. catagories form horizontal rows;gases form vertical columns D.

    asked on February 12, 2013
  58. MGMT

    5. Which kind of goal concerns cooperation between departments?

    asked on December 16, 2012
  59. math

    Each week, Bart earns a base rate of $85 and a commission on each dollar of merchandise he sells. If Bart sells $3600 in one week and c represents the commission percentage, which algebraic expression represents his earnings for that week? would the answer

    asked on October 2, 2012
  60. Chemistry

    What quantity of heat is necessary to convert 50.0 g of ice at 0.0 C into steam 100,0 C? The heat of fusion is 80.0 cal/g, the heat of vaporization is 540 cal/g, and the specific heat of water is 1.00 cal/gC.

    asked on March 27, 2012
  61. Chemistry - Gravimetry

    A commercial algaecide containing an organocopper compound was treated with concentrated nitric acid and evaporated to dryness. After dissolution of the residue, the copper was precipitated with -benzoin oxime. If the sample weighed 15.443 g and the

    asked on January 16, 2012
  62. Psychology

    Animosity often exists because people are unwilling or unable to see the world or a single experience from the perspective of another person. People often make snap judgments based on the first thing they see or hear about a person. Consider a person in

    asked on August 10, 2011
  63. trig

    How do I prove these trig identities? secx-cosx/tanx =sinx And 1+sinx/cosx+ cox/ 1+sinx=2secx

    asked on May 15, 2011
  64. math

    Which of these triangles do not eist? a scalene right triangle an isosceles right triange an eguilateral right triangle an equilateral acute triangle

    asked on February 25, 2011
  65. 5th grade math

    6 1/8 - x = 1 7/8 ? would it be 4 1/8 = x

    asked on November 30, 2010
  66. math

    If you have a circle graph 15 students like basketball 10 like soccer and 5 like softball. Write a ratio problem that relates to this graph and solve the problem. ratio would be 5/6,1/6,1/3 how would a solve this if this is the right ratio. Thank you so

    asked on November 7, 2010
  67. math

    If a room has a perimeter of 32feet how many square floor tiles with sides 1 foot long are needed to cover the floor of the room? Would it be 64 tiles since the area would be 64 sq feet.

    asked on November 7, 2010
  68. Biology

    Herring live in salt water. which do they have to do..expel large amounts of water to offset osmosis, need to take in large amounts of water of offset osmosis, slowly dehydrate over the course of their lives, or slowly swell upover the course of their

    asked on June 4, 2010
  69. Chemistry (Stoichiometry)

    what mass of so2 is produced from the reaction between 31.5g of s8 and 8.65g of o2? I know how to find the limiting reagents and all but I need a little help knowing how to find the mass of the product.

    asked on May 3, 2010
  70. chemisty

    If 15 grams of copper (11) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? Hint: you will need two stochiometry problems to determine which reactants limit the amount of NaCl produced? How do you figure out the 2

    asked on January 9, 2010
  71. Physics

    Jenny and Betty are having a great time at Busch Gardens riding the Ubanga Banga bumper cars. Jenny, who is traveling southward in her bumper cars, aims her cars toward Betty, who is traveling northward in her bumper car. The cars collide and briefly come

    asked on March 10, 2009
  72. Physics

    A Chinook Salmon has a maximum underwater speed of 3.58 m/s, but it can jump out of water with a speed of 6.68 m/s. to move upstream past a waterfall, the salmon does not need to jump to the top of the fall, but only to a point in the fall where the water

    asked on September 24, 2006
  73. math

    Given that α is in Quadrant 1 and tan(α)=67, give an exact answer for the following: sin(2α)= cos(2α)= tan(2α)=

    asked on May 21, 2020
  74. precal

    Find f(x) and g(x) such that h(x) =(f o g)(x) given h(x)=(2x+8)^7

    asked on January 21, 2020
  75. Social studies help quick

    Why do United States citizens have civic responsibilities? A in a republic the president can order any citizen to help. B in a democracy every citizen must earn their rights C in a democracy the country is run by all citizens working together. D in a

    asked on September 20, 2017
  76. geometry

    what are the step to find the volume of an aquarium in cubic feet when its height is 25 1/2 inches and its radius 21 inches?

    asked on November 30, 2016
  77. Physics

    Calculate the speed a spherical rain drop would achieve falling from 5.00 km (a) in the absence of air drag (b) with air drag. Take the size across of the drop to be 4 mm, the density to be 1.00×103 kg/m3 , and the surface area to be πr2

    asked on November 1, 2016
  78. Math

    A rectangular picture frame measures 4.0 inches by 5.5 inches. To cover the picture inside the frame with glass costs $0.99 per square inch. What will be the cost of the glass to cover the picture? My answer is $21.78 is this right

    asked on March 17, 2016
  79. algebra

    how do you solve q(x) = 6 - 5x ; 21

    asked on January 14, 2016
  80. Biology

    what is the scientific meaning to the word foundation?

    asked on August 18, 2015
  81. math

    Suppose h(x)=1/\sqrt x for x>0. Does h have an inverse? If so, find h^-1(4).

    asked on March 26, 2015
  82. algebra

    Suppose g(x)=4x^2+8x+13. Does g have an inverse? If so, find g^{-1}(25)

    asked on March 26, 2015
  83. math

    what is set-up for three dollars less than half of $128. ?

    asked on March 18, 2015
  84. science

    a box weighs 200 N. If you push on the box with a force of 15 N and the box does not move, how much work did you do? A) 0 J B) 15 J C) 15 N or D) 3000J

    asked on January 16, 2015
  85. Check Answers?

    Question 1 of 5 The yellow fog that rubs its back upon the window-panes, The yellow smoke that rubs its muzzle on the window-panes, Licked its tongue into the corners of the evening, Lingered upon the pools that stand in drains, Let fall upon its back the

    asked on January 2, 2015
  86. Poem

    Question 4 of 5 'Hope is the thing with feathers That perches in the soul, And sings the tune--without the words, And never stops at all, 'And sweetest in the gale is heard; And sore must be the storm That could abash the little bird That kept so many

    asked on January 2, 2015
  87. English Please.

    It had been there when the midwife had announced, ‘You’ve a boy.’ The hat was there when his wife had their second little joy. Why does the author MOST likely choose the words, ‘their second little joy’? A)They had twin boys. B)It expresses that

    asked on January 2, 2015
  88. Chemistry

    Name the property that each change depends on. Then classify the property as either chemical or physical. a) You separate a mixture of gravel and road salt by adding water to it b) Carbon dioxide gas freezes at a temperature of -78C

    asked on September 8, 2014
  89. Finance

    What is the present value of $3,800 at 8.9 percent compounded monthly for five years. Thurs far, I have P= ?/(1+i)n (1 + 0.89/12)12*5 (1.0074167)60

    asked on May 12, 2014
  90. algebra

    A video store charges a monthly fee of 7.50, but the charge to rent each movie is only 1.00 per movie. Another store has no membership fee, but it costs 2.50 to rent each movie. How many movies need to be rented each month for the total fees to be the same

    asked on October 1, 2013
  91. chemistry

    Calcium oxide and carbon are reacted to produce carbon monoxide and calcium carbide CaC2. When one mole of calcium carbide is formed, 464.8kJ is absorbed. Write a thermochemical equation for this reaction.

    asked on June 22, 2013
  92. Solve the polynomial inequality

    Solve the polynomial inequality and graph the solution set on a real number line. Express the solution set in interval notation. x^3+x^2+4x+4

    asked on April 9, 2013
  93. physics

    A sled is accelerating down a hill at a rate of 1 m/s2 . If the mass of the sled is suddenly cut in half and the net force on the sled is doubled, what is the acceleration of the sled?

    asked on April 4, 2013
  94. Statistics

    If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35

    asked on December 18, 2012
  95. Statistics

    Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the

    asked on December 17, 2012
  96. physics

    When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 950 N and the drag force has a magnitude of 1100 N.

    asked on October 23, 2012
  97. finance

    You buy an 8% annual coupon bond from CARRIS Inc. that has a 25 year maturity and a required return of 12%. The par value is $1,000. You sell the bond five years later when the required return is 10%. What is the beginning price of the bond when it is

    asked on October 11, 2012
  98. Quantitative Chemical Analysis

    assume an unknown sample to be 15% copper, weigh enough dried ore sample to use approximatele 35-45mL of .09M S2O3-. How many grams do I need to measure out to use 40.00mL of the thiosulfate solution?

    asked on September 28, 2012
  99. Geometry

    Similar ratio and ratio perimeter for two regular octagons with area=18in squared and 50in squared. 9:25, 3:5 or 9:25, 9:25

    asked on April 15, 2012
  100. Math

    Convert to degrees: (5pi/8) How would I do this?

    asked on December 9, 2011


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