Most popular questions and responses by Jill
  1. 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
  2. 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
  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. 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
  5. Physics net force and mass

    Four boxes of various masses are placed on a friction free table. Rank these boxes according to net force by listing them in order from greatest to least. A) B) C) D) Thank You :) (the |_ kg | are the boxes) =)

    asked on January 31, 2012
  6. 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
  7. 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
  8. math

    two billion,six hundred million in expanded notation using powers of 10 (2x 10^11) + (6x10^8) would that be correct??

    asked on April 10, 2012
  9. 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
  10. 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
  11. I did it.. Check Plz?

    It saw with lucid eyes inhuman, divine Line 12 has an example of a stylistic device. What is that device called? A)allusion B)inversion

    asked on January 2, 2015
  12. 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
  13. 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
  14. math

    write 20 million,five hundred thousand in expanded form using exponents

    asked on April 25, 2011
  15. 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
  16. 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

    Need help trying to tell my daughter what or how to draw this........ DRAW a figure composed of three different rectangles that has a perimeter of 140 yards. Use measurements that are in yards and feet to label the sides of your figure......

    asked on April 16, 2014
  18. 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
  19. 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
  20. 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
  21. Chemistry.

    Ca(HCO3)2(s) decomposes at elevated temperatures according to the stoichiometric equation Ca(HCO3)2(s)-> CaCO3(s) + H2O(g) + CO2(g) a.) If pure Ca(HCO3)2(s) is put into a sealed vessel, the air is pumped out, and the vessel and its contents are heated, the

    asked on November 22, 2010
  22. 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
  23. 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
  24. 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
  25. 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
  26. Finance

    Slater Lamp Manufacturing has an outstanding issue of preferred stock with an $80 par value and 11% annual dividend. What is the annual dollar dividend? If it is paid quarterly, how much will be paid each quarter?

    asked on April 13, 2010
  27. 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
  28. 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
  29. Physical Science

    A race car goes around a level, circular track with a diameter of 1km at a constant speed of 90 km/h. What is the centripital acceleration?

    asked on September 5, 2011
  30. 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
  31. physics

    A student pulls a 60 newton sled with a force having a magnitude of 20 newtons. what is the magnitude of the force that the sled exerts on the student?

    asked on January 16, 2011
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. physics

    Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 428 N and F2 = 358 N. (Assume up and to the right as positive directions.) a) What is the resultant of these two forces? magnitude and direction b) If the

    asked on March 1, 2012
  38. Physics

    What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is?

    asked on April 26, 2010
  39. 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
  40. math

    how would you write 7572 1/8 using words would it be seven thousnd five hundred seventy two and one eigth

    asked on March 31, 2011
  41. English

    Seven brothers' families grew to more than one thousand people in 100 years. Does families need an apostrophe? The mens group made t-shirts for the children. would mens be 's or s' ?

    asked on December 15, 2010
  42. 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
  43. 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
  44. 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
  45. Chemistry

    Citric acid is a tri-protic acid with a Ka1 =8.4x10-4 Ka2=1.8x10-5 and Ka3=4.0x10-6. calculate the pH at the 2nd equivalence point in the titration of 85.5 mL of a .21 M citric acid solution with .25 M NaOH. Calculate the pH, after 25.8 mL of NaOH have

    asked on December 9, 2015
  46. chem

    copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic weight of copper to determine the mass of the other copper isotope. How do I do this? Atomic weight=62.939*.6917 + x (1-.6917)

    asked on February 8, 2007
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. math

    A basket with 12 apples has mass of 3105 grams. The same basket w 7 apples has a mass of 1980 grams. Each apple has same mass. What is mass of the basket

    asked on September 30, 2011
  53. Middle ga state

    Rank these bonds from most ionic to Most covalent in character Br-F Ca-F F-F Cl-!@#$%^&-F

    asked on November 24, 2015
  54. math

    you need to make a three dimensional model of a soup can using paper and tape. What 3 dimensional shapes do you need to cut ot make the model?

    asked on April 30, 2013
  55. Geometry

    Find the area of a decagon with side of 4cm. Find the area of a pentagon with side length of 10cm Find the area of a hexagon with radius of 5in.

    asked on April 15, 2012
  56. Physics net force and mass

    Four boxes of various masses are placed on a friction free table. Rank these boxes according to net force by listing them in order from greatest to least. A) B) C) D) Thank You :) I forgot to include: Which one has the most force to the right? I appreciate

    asked on February 1, 2012
  57. pre calc

    a salt shaker is sitting 4cm from the center of a lazy susan. phoebe small spins the lazy susan through an angle of 120. how do i set this up to find how many radians the shaker turned?

    asked on January 4, 2010
  58. science

    Suppose you are standing on the sidewalk. Describe the direction of your motion relative to the car and plane. answer my motion would seem slower than the car but faster than the plane. I know there has to be a better answer, any suggestions?? Thank you.

    asked on October 4, 2011
  59. math 8th grade

    Face cards are removed from a standard deck of cards and the rest are set aside. two cards are drawn at random from the face cards. once a card is selected, it is not replaced. Find each possibility. P(jack and then king)? P(two black cards) answer 1/2 ?

    asked on April 13, 2015
  60. chemisty

    calculate the heat energy released when 25.8 g of liquid mercury at 25 C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: heat capacity of Hg-->28.0 melting point-->234.32 K enthalpy of fusion-->2.29 kj/mol

    asked on June 27, 2013
  61. Physics

    You are trying to overhear a juicy conversation, but from your distance of 17.0 m, it sounds like only an average whisper of 35.0 dB. So you decide to move closer to give the conversation a sound level of 80.0 dB instead. How close should you come? d= ??

    asked on November 20, 2007
  62. physics

    A student is skateboarding down a ramp that is 6.52 m long and inclined at 19.8 degrees with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp 2.24 m/s. Neglect friction and find the speed at the bottom of the ramp in

    asked on December 14, 2014
  63. 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
  64. math

    The height of a soccer ball that is kicked from the ground can be approximated by the function y=-16x^2 +32x where y is the height of the soccer ball on feet x seconds after it is kicked. Graph this function. find the soccer balls maximum height, and the

    asked on April 9, 2014
  65. Geometry Multiple Choice

    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
  66. CHEM

    Convert 3.6 times 10 to the second atm to torr. I don't understand how to get atm to torr???? 1 atm = 760 torr. Is the answer 270,000 torr? Are you in to significant figures. I suspect so since the question is 3.6 x 10^2 atm. If so, then 3.6 x 10^2 atm x

    asked on July 17, 2007
  67. 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
  68. 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
  69. Chemistry

    What is the minimum amount of 5.9M H2SO4 necessary to produce 27.7g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)

    asked on March 5, 2014
  70. math 5th grade

    by what fraction name for 1 must 2/3 be multiplied to form a fraction with a denominator of 15? also what is the number in this sequence ...,100,10,1,...? would it be -1? thank you

    asked on January 19, 2011
  71. Accounting

    The City of Jamestown has agreed to acquire a new city maintenance building under a capital lease agreement. At the inception of the lease, a payment of $100,000 is to be made; nine anual lease payments, each in the amount of $100,000, are to be made at

    asked on February 11, 2010
  72. physics

    . A 2.0 kg brick has the dimensions 7.5 cm x 15 cm x 30 cm. Find the pressure exerted by the brick on a table when it is resting on its various faces.

    asked on November 8, 2014
  73. chemistry

    what is the percent of recovery if you begin with 0.421 grams of copper and recover 0.325 grams?

    asked on February 7, 2012
  74. Math

    There are 7 rap songs, 7 rock songs and 5 classical songs to select from. Three songs are to be chosento play at random -what is the probability that only classical songs are selected? -what is the expected number of classical songs to be selected?

    asked on January 25, 2011

    four objects, each with a positive charge of 1.0 x 10^-6 C, are placed at the corners of a 45 degree rhombus with sides of length 1.0 m. Calculate the magnitude of the net force on each charge.

    asked on November 25, 2010
  76. Science

    arrange the following aqueous solutionsin order of increasing freezing points(lowest to highest temperature): 0/10m glucose, 0.10m BaCl2, 0.20mNaCl, and 0.20m Na2SO4.

    asked on September 11, 2013
  77. math

    I cannot figure out how to make a 3 circle veen diagram from the following problem. Can someone please help me? Country-westren songs emphasize three basic themes: love, prison, and trucks. A survet of the local country-westren radio station produced the

    asked on October 4, 2009
  78. chemistry

    Two 20.0 g ice cubes at -16.0 C are placed into 285 g of water at 25.0 C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity of H2o(s)-->37.7 heat capacity of

    asked on June 27, 2013
  79. 5th grade math

    A set of books fills a shelf that is 24in long each book is 3/4 inch thick. How many books are in the classroom shelf? Would it be 18 ???

    asked on December 8, 2010
  80. math

    use 6 of the digits from 1 to 9 to make each number. use each digit only once the greatest possible number with 3 ten thousands ( I don't get this one at all)

    asked on November 21, 2007
  81. 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
  82. 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
  83. Physics

    An empty elevator of mass 2.7x10^2kg is pulled upward by a cable at an acceleration of 1.2m/s. What is the tension in the cable? What would the tension be if the elevator were accelerating downward at 1.2m/s^2?

    asked on October 14, 2010
  84. math

    Claire jogs around an oval track and is able to complete one lap in 5 minutes. If she jogs at the same pace for 42 minutes, how many laps would she be able to jog? Write an inequality and find the number of whole laps Claire completes.

    asked on March 2, 2017
  85. 5th grade math

    The library has 2,000 books. The books are sorted 500 children,fiction and nonfiction. There are 200 more fiction than nonfiction. How many fiction and nonfiction books are there? There are 950 fiction books and 550 nonfiction books is my answer how would

    asked on February 22, 2010
  86. Math C30

    An airplane is leaving the first airport (A) at a bearing of 70 degrees. It then travels 238 miles to airport B. After fueling up, it leaves at a bearing of 120 degrees and lands at airport C. After fueling up it finally returns to airport (A) at a bearing

    asked on June 7, 2012
  87. 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
  88. math

    If molly tosses a coin and rolls a number cube, what is the probability of the coin landing heads up and the number cube stopping with a 6 on top?

    asked on May 1, 2011
  89. Math

    A class has 5 girls 7 boys in seventh grade. 2 girls and 2 boys in eight. Randomly selects a seventh and eight grader. What is probability that the students picked are girls

    asked on March 13, 2018
  90. Math

    A rotating water sprinkler can spray water a distance of 15m. What area of grass can the sprinkler cover?

    asked on May 31, 2016
  91. 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
  92. math

    You have a 1200 foot roll of fencing and a large field. You want to make two smaller fields by splitting a rectangular enclosure in half.. 1. Use an algebraic solution to find the dimensions of the largest such enclosure. How big will the enclosure be?

    asked on April 3, 2011
  93. math

    How can I show a bar model for this problem? Naomi Macy and Sebastian have 234 stamps in all. Naomi gives 16 stamps to Macy and 24 stamps to Sebastian. Naomi then has 3 times as many stamps as Macy, and Macy has twice as many stamps as Sebastian. how many

    asked on October 25, 2015
  94. 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
  95. 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
  96. Physics

    A skier skiing downhill reaches the bottom of a hollow with a velocity of 20.0m/s, and then coasts up a hill with a 12 degree slope. If the coefficient of kinetic friction is 0.11, how far up the slope will she travel before she stops?

    asked on October 14, 2010
  97. math

    the ratio of boys to girls is 7:8 How many boys are there in school if there are 968 girls? My answer is 581 boys is this correct??

    asked on September 10, 2015
  98. 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
  99. 5th grade math

    The diameter of a soup can is about 7cm the label wraps around the can , about howmany cm long must the label be to go all the way around the soup can? use 22/7 for pi

    asked on November 30, 2010
  100. accounting

    You need $28,974 at the end of 10 years, and your only investment outlet is an 8 percent long-term certificate of deposit (compounded annually). With the certificate of deposit, you make an initial investment at the beginning of the first year. A. What

    asked on January 10, 2010


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