sheila

Most popular questions and responses by sheila
  1. chemistry

    You are analyzing a solid isolated from a reaction and find that its boiling point is over 1000 ∘C. You dissolve the compound in water solution and recrystallize it to produce some solid crystals that you use to determine that the compound is a

    asked on January 23, 2014
  2. chemistry

    given 2CH3OH+3O2->2CO2+4H2O 1. Calculate number of grams of CH3OH required to react with 34.0L of O2 at STP. 2. How many liters of CO2 at 18 degrees Celcius and 6.94 atm are produced when 3.40 mol of CH3Oh is burned completely. 3. What volume of CO2 is

    asked on November 13, 2012
  3. Statistics

    A recent survey found that 72% of all adults over 50 wear glasses for driving. In a random sample of 100 adults over 50, what is the mean and standard deviation of the numbe who wear glasses?

    asked on March 29, 2012
  4. Math

    Ten students achieve the following test scores on an exam: 78, 69, 45, 89, 74, 37, 99, 77, 100, 82. What is the interquartile range of these scores?

    asked on April 17, 2017
  5. prealgebra

    One cellular phone carrier charges $26.50 a month and $0.15 a minute for local calls. Another carrier charges $14.50 a month and $0.25 per minute for local calls. For how many minutes is the cost of the plans the same?

    asked on December 3, 2013
  6. Chemistry

    What hydroxide concentration is required to (a) Initiate precipitation of Ag2CrO4 from a solution that is 2.12 x 10^-3 M in Ag+? (b) lower the Al^3+ concentration in the foregoing solution to 1.00 x 10^-9

    asked on January 29, 2019
  7. Algebra

    Two cell phone companies have different rate plans. Run fast has monthly charges $8 plus $8 per gig of data. B A & D 's monthly charge is $15 plus $4 per gig of data. Your task is to determine under what circumstances each company has the better pricing.

    asked on April 29, 2019
  8. Chemistry

    How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep it from freezing at -20 oC? Kf = 1.86 oC/m.

    asked on February 3, 2015
  9. math

    Which of the following salaries will have a purchasing power of $24,035 if the inflation rate is five percent?

    asked on January 24, 2013
  10. esl

    Why do we say "he is average height" and not he has average height". don't we use have for a noun and is for an adjective?

    asked on October 2, 2015
  11. english

    Which of the following would most likely be an entry in a sentence outline? A. Education beyond high school versus education beyond college B. Education as a pathway C. Education as a tool D. Education can change a person's life.

    asked on April 15, 2015
  12. Accounting

    How do you find the ratio of time devoted to the business?

    asked on March 11, 2008
  13. MATH! PLEASE REPLY ASAP!

    OPQRS is a regular square-pyramid whose base has sides of 7 cm. Given that the total surface area of the pyramid is 161 cm2, find its slant height.

    asked on January 23, 2011
  14. Geometry

    ray OB is the bisector of angle AOC and ray OC is the bisector of angle BOD. m

    asked on September 5, 2013
  15. Math Word Problem

    To make fruit punch, Edie mixes two kinds of juices in the following ratio: 1 cup of blueberry to 3 cups of red raspberry. How many cups of red raspberry will Eddie need to make 48 cups of fruit punch? How do you solve this? I was trying to divide 48 by 3

    asked on December 9, 2016
  16. math

    What multiplication fact could you use to find a number that can be divided equally by 8 and 9? My answer is 8 x 9 = 72. Is this correct?

    asked on February 14, 2012
  17. advanced pre algebra

    -6 >/= to g + 4

    asked on December 10, 2013
  18. MAT126: Survey of Mathematical Methods

    All numbers in our real number system are the product of prime numbers. Complete the following steps for this discussion: List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15

    asked on December 20, 2013
  19. algebra

    A department store purchases gift boxes that each have a volume of 256 cubic inches. The width of each box is 4 less than the length. The height is twice thw width. What are the dimentions of a gift box?

    asked on February 23, 2008
  20. math

    write -5.5 recurring as a fraction or mixed number in simplest form.

    asked on November 3, 2013
  21. physiology

    a One of the major physiological factors that triggers thirst is: a) a rise in plasma osmolarity b) a dry mouth from high temperatures c) becoming overly agitated d) drinking caffeinated beverages a

    asked on December 11, 2006
  22. PHYSICAL SCIENCE

    How do the pressure variation with depth affect our ability to explore the ocean?

    asked on October 22, 2012
  23. stats.& Prob

    Astudy shoed 53% of college applications were submitted online. Assume this result is based on sa simple random sample of 1000 applications with 530 submitted online. Use 0.01 sig.level to test claim that among all student applications the percentage

    asked on August 15, 2011
  24. chemistry

    A sample of solid sulfur is heated with an electrical coil. If 105 joules of energy is added to a 12.4 gram sample initially at 24.4°C, what is the final temperature of the sulfur?

    asked on April 8, 2013
  25. microeconomics

    If for a firm MRP > MFC, then the firm: a. is maximizing profits and should continue producing its current output. b. is maximizing factor costs and therefore is maximizing profits. c. should produce more output by increasing the quantity of factors

    asked on August 18, 2007
  26. college, math

    Karen and Wayne need to buy a refrigerator because theirs just broke. Unfortunately, their savings account is depleted, and they will need to borrow money in order to buy a new one. Sears offers them an installment loan at 12% (add-on rate). If the

    asked on November 17, 2014
  27. Physics

    Four charges are located at the corners of a square as shown below. Calculate the magnitude and direction of the net force on charge -3Q and charge 4Q. (sorry don't have picture, but it is of a square with corners -Q, 2Q, -3Q, and 4Q clockwise). I don't

    asked on May 13, 2010
  28. Greatest Common Factor

    There sre 16 rocks that are green and 24 rocks that are blue. Sharon is dividing her green and blue rock collection into bags. Each bag will contain the same number of each color of rock. How many rocks of each colr will be in each bag?

    asked on February 8, 2014
  29. Physics

    Light travels at a speed 3x10^8 m/s. What distance does it travel in a time of 0.1s?

    asked on August 24, 2012
  30. Math Estimating Sides of a Triangle

    Use the diagram below to answer the question that follows. I couldn't copy the diagram into this. It basically shows a Triangle ACD with CD=100ft. Then another line intersects above angle A and reads BE= 30ft. AB=50ft. and BC=? That is the part it wants

    asked on December 7, 2016
  31. Physics

    A gamma-ray photon produces an electron-positron pair, each with a kinetic energy of 275keV . What was the energy of the photon? E=in MeV What was the wavelength of the photon? wavelength in m Please help thank you!

    asked on April 23, 2013
  32. Pre-Calc-Please check my answer-I think its correc

    Could someone please check these-I had tried one last night but it was really wrong so I'm been working-hopefully these are correct. What are the roots of the equation and answers have to be simplified 2x^2 + 5x-10 =0 2x^2 + 5x-10+10=0+10 2x^2 + 5x = 10

    asked on September 7, 2011
  33. math

    i need help in solving these 2 problems...please help..thank you... Your home is built on a square lot. To add more space to your yard, you purchase an additional 4 feet along the side of the property. The area of the lot is now 9600 square feet. What are

    asked on January 29, 2008
  34. math

    Julius sold 5x as many computers as Sam sold last year. In total they sold 78 computers. How many computers did Julius sell. **Solve each problem by WRIING and solving the equation.

    asked on November 13, 2013
  35. Chemistry

    When calcium oxelate is treated with an acidic solution of potassium permanganate, the following reaction occurs: CaC2O4(s) + MnO4-(aq) = Ca+2(aq) + CO2(g) + Mn+2(aq) Balance the equation.

    asked on October 16, 2010
  36. Math Word Problem

    Riding on a school bus are 20 students in ninth grade, 10 students in tenth grade, 9 students in eleventh grade, and 7 students in twelfth grade. Approximately what percent of students on the bus are in ninth grade? How do I go about solving this?

    asked on December 9, 2016
  37. Physics conceptional question Please help

    Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

    asked on April 24, 2013
  38. Physics Please help out

    Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

    asked on April 24, 2013
  39. Physics

    Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

    asked on April 22, 2013
  40. Algebra

    Annual profit in thousands of dollars is given by the function, P(x) = 12x-100, where x is the number of items sold in thousands x ¡Ý 10. Will this profit function have a maximum if so what is it?

    asked on July 2, 2011
  41. sentence skills

    which is the most effective coordinating conjunction to jointhe following independent clauses.... Miriam wants a digital picture frame,___________ she cannot afford one just yet. a) but b) for c) so d) and

    asked on May 26, 2011
  42. 7th grade - Social Studies

    how do you think women and native americans felt about not being included under the 14th amendment? how do you think white women felt when former slaves were allowed to vote and they were not? what percent of slaves were not freed after the issue of the

    asked on October 12, 2009
  43. Environmental Science

    What steps do you think can be taken to reduce the harmful effects of human activities on biogeochemical cycles? Which businesses would these changes impact the most? Thank you for using the Jiskha Homework Help Forum. Here are some links on life and

    asked on March 15, 2007
  44. geometry

    A tourist is standing in the center of a roof 1000 feet skyscraper wants to a photo of the top of the adjacent skyscraoer that is 1500 feet tall what is the angle of elevation from the tourist to the top of the skyscraper to nearest yenth

    asked on February 22, 2017
  45. math

    Arrange the digits 5,6,7,8 and 9 in the boxes to make the greatest product

    asked on January 9, 2017
  46. Math M131A

    a rubber ball has the property that on any bounce it returns to 1/3 of the height from which it just fell. Suppose the ball is dropped from 108 ft How far has the ball traveled by the fourth bounce?

    asked on September 24, 2015
  47. Chemistry

    Determine the number of molecules of the compound iron phosphate with 129.68 g Fe3(PO4)2

    asked on March 22, 2015
  48. Physics PLEASE HELP

    When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV

    asked on April 24, 2013
  49. Physics

    When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV Please someone help me out. Thank you.

    asked on April 22, 2013
  50. Chemistry

    What chemical compound is formed in the reaction when 6M HCl and 1M NaOH is reaction?

    asked on August 30, 2012
  51. chemistry

    True or False? An equilibrium constant K_c=1x10^7 for a reaction indicates that the reaction favors product formation.

    asked on May 2, 2010
  52. Math

    On a test I was given 2 triangles. One triangle gave measurements of all three sides as 2, 4, and 5. The next triangle had sides given 4 and 8 and it asked what the third side should be if the triangles were perpendicular. How would I solve this? Do I find

    asked on January 13, 2017
  53. maths

    mrs chan baked some cupcakes. She gave 1/6 of the cupcakes to her neighbour and 7/10 of this remaining cupcakes to her sister. If she had 12 cupcakes left, how many cupcakes did she bake together?

    asked on July 22, 2016
  54. biochem

    why do lipids less dense than proteins? PLEASE HELP ME ANSWER THIS QUESTION. it really makes me wonder because lipids are much larger molecule compare to protein molecule but why protein is denser?

    asked on February 22, 2016
  55. algebra

    One cellular phone carrier charges $26.50 a month and $0.15 a minute for local calls. Another carrier charges $14.50 a month and $0.25 per minute for local calls. For how many minutes is the cost of the plans the same?

    asked on December 3, 2013
  56. math

    if each guest eats 2/3 of a small pizza, how may guests would eat 12 small pizzas.

    asked on November 3, 2013
  57. crt/205

    I have trouble with labeling these statements if someone can help I would appreciate it. I need to know if the labeling is correct if not what is the correct labeling. I believe these are ambiguous or vague statements-1. federal reserve looking to spend

    asked on October 31, 2010
  58. Data Management

    Does interchanging the independent and dependent variables change the correlation coefficient for the set of data

    asked on November 13, 2008
  59. Spanish

    In act 3 in Knight of Olmedo in the bullfighting scene I need to answer the question how rodrigo reacted to Alonso winning, and also what incident in act 3 made rodrigo want alonso dead more than ever besides alonso loving ines. thanks

    asked on September 22, 2008
  60. microeconomics

    A firm that is perfectly competitve will continue to hire factor units as long as: a. MRP < MFC b. MRP > MFC c. VMP < MFC d. MC > MR

    asked on August 18, 2007
  61. computer

    this isnt really a school question but i have a question about the sun java...it wouldnt load any of my games using it but whenever i deleted it and using the regular java...its working fine...it doesnt make any sense...please i hope someone can explain

    asked on March 19, 2007
  62. history

    ive got 2 questions....what points does Thomas Paine make in the pamhlet, Common Sense?? and what impact did Pain's pamphlet have in the colonies?? This site will give you an analysis of the pamphlet: http://www.sparknotes.com/lit/commonsense/

    asked on December 5, 2006
  63. math

    i think this one is right..but im not sure..Argyle has 8 T-shirts and 5 pairs of shorts that he wears with either sandals or sneakers. If all the colors and patterns coordinate, how many different outfits can he make?? i think its 80...but im not sure one

    asked on October 18, 2006
  64. math

    please help... A new car is sold with or without antilock brakes, with or without a Cd player, with or wothout electric seats, and with or without a sunroof. How many different choices are there?? A new car is sold with or without antilock brakes, 2

    asked on October 18, 2006
  65. Third Grade Math

    What fraction would these coins represent? 3 Quarters, 4 nickels, 2 dimes I can write a fraction for each of them. But I don't know how to write a fraction for all of them together. Can someone explain this to me?

    asked on November 29, 2016
  66. CHEMISTRY

    Total Pressure in a vessel containing Oxygen collected over water at 25 *C was 723 torr. The Vapor Pressure of water at that Temperature is 23.8 torr. What was the pressure of gas?

    asked on October 5, 2014
  67. Physics

    When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV

    asked on April 23, 2013
  68. science

    what is the difference between weathering and erosion

    asked on January 7, 2013
  69. Physical Science

    If liquid pressure were the same at all depths, would there be a buoyant force on an object submerged in the liquid?

    asked on October 23, 2012
  70. writing algebriac expression

    The total amount of money (in cents) in y quarters, 7y dimes, and (2y - 1) nickles.

    asked on September 26, 2012
  71. statistics

    According to a recent studey, 1 in every 4 women has been a victim of domestic abuse at some point in her life. Suppose we have randomly and independently sampled twenty-five women and asked each whether she has been a victim of domestic avbuse at some

    asked on March 29, 2012
  72. Business Writing

    What comes first the business letter, the interoffice memorandum or the email

    asked on March 6, 2011
  73. chemistry

    A girl is celebrating her seventh birthday. Each guest is served one large slice of chocolate cake, a hamburger, French fries, and some oranges. Identify the food groups mentioned above. If one slice of chocolate cake contains 35g of carbohydrate, 15g of

    asked on January 17, 2011
  74. math

    tell wether the event is ibest described as impossible, unlikley, likley to occur half the time, quite likley, or certain, explain yor resoning. the probability of rain is 80%, or 0.8 how can i find the answer to this?

    asked on September 9, 2010
  75. algebra

    this is what u do on your first problem....first u take out the greatest common factor that would go into all of them... 4n^2-20n+24...now what number will go into all of them...well 4 will...4 will go into 4,20,and 24...so. it would be like

    asked on November 13, 2006
  76. pharmacy calculation

    A suspension contains 2400 mg of active drug in 1000 ml waht is the percentage of drug in the final product? what is the answer? Total mass is 1000g + 2.400g. Percent by mass (m/m)= 2.4 /1002 * 100

    asked on October 23, 2006
  77. maths literacy,geography,lifescience,,agricultural

    which career can i pick with this subjcts

    asked on February 28, 2014
  78. math

    Find the complex zeros of the polynomial function, and write f in factored form: f(x)= x^3 - 8x^2 + 30x - 36

    asked on August 21, 2013
  79. Physics

    Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

    asked on April 23, 2013
  80. chemistry

    80g of NaCl are dissolved in 400g H2O. if the vapor pressure of the water is 40 mmHg , what is the vapor pressure of NaCl above the solution?

    asked on February 12, 2013
  81. Math

    The cheetah can 60 miles per hour. How many miles the can run for every half. Hour up to 2 hours?

    asked on January 24, 2013
  82. Physics

    A sandbag is dropped from the helicopter 125 m above the ground. What is its velocity at a height 60.0 m and when it hits the ground?

    asked on September 30, 2012
  83. Algebra

    Simplify. Please show all work. 6b^2 - 4b + 3b^4 - (7b^3 + b^4 - 4b)

    asked on June 20, 2012
  84. Chemistry-Please check

    When the kidneys secrete hydrogen ions, does the pH of the urine drop or is carbonic acid formed in the blood? Secondly, when the kidneys secrete hydrogen ions, it would raise the pH of the blood, correct? I'm really confused onthis and would appreciate

    asked on April 25, 2012
  85. Algebra II

    How long would it take to earn $7000 on a 3500 dollar investment at rate of 7.8% compounded continuously? Would it be something like this: 7000=3000*(1+0.078)/? not sure about what to divided by??? Help-I'm really confused!!!!

    asked on November 21, 2011
  86. Pre-Calc

    Could someone please check these-I had tried one last night but it was really wrong so I'm been working-hopefully these are correct. What are the roots of the equation and answers have to be simplified 2x^2 + 5x-10 =0 2x^2 + 5x-10+10=0+10 2x^2 + 5x = 10

    asked on September 7, 2011
  87. Pre-Calc-Please check my answer-I think I have it

    Could someone please check these-I had tried one last night but it was really wrong so I'm been working-hopefully these are correct. What are the roots of the equation and answers have to be simplified 2x^2 + 5x-10 =0 2x^2 + 5x-10+10=0+10 2x^2 + 5x = 10

    asked on September 7, 2011
  88. biology

    increase in the amount of living material and formation of new structures in an organism: a characteristic of all living things

    asked on August 25, 2011
  89. English

    Does this poem make sense? Chocolate This is my weakness I must confess The smell of chocolate is so sweet It is so good and a wonderful delight My one and only friend late at night Here to satisfy all my needs and wants Without I don’t know what I would

    asked on June 18, 2011
  90. English

    I have to write a triolet.Would you proof read this one for me? Title: My Mother My mother always wiped away all my tears God must have sent this woman from above When I cried she had a listening ear She took away all my worries and fears My mother always

    asked on June 18, 2011
  91. managerial economics

    assuming that the firm's goal is to maximize present value of the profits in the subsequent 5 years, which of the following flows of profit would achieve that goal? Justify your answer. Note that the flows are represented by 5-tuples, i.e. five number each

    asked on February 14, 2011
  92. Physics-Please check my answer-I've been working o

    If I went tubing with my little sister, and I have a larger mass, why would we both reach, in terms of energy, the bottom of the hill at the same time; Originally I thought because we would both be accerlerating at the same rate but that doesn't explain

    asked on January 11, 2011
  93. Algebra II-Please check my calculation

    Find center, vertices, co-vertices and foci for the following; (x-3(^2/49 + (y-4)^2/4 = 1 Center would be (3,4) A=7 b=2 Vertices would be found this way: (h+-a,k) (3-7,4) (3+7,4) Vertices = (-4,4) (10,4) Co-vertices (h,k+-b) (3,4-2) (3,4+2)

    asked on March 28, 2011
  94. Math

    A square is folded in half to form a rectangle. If the resulting rectangle has a perimeter of 15 inches,what is the are of the original square?HELP...please?

    asked on September 16, 2010
  95. algebra

    can someone help me factor these expressions... 40xy and 36m^2g^2

    asked on August 18, 2010
  96. algebra

    The length of a rectangular field is 7 meters more than twice its width. If the perimeter is 140 meters, find the dimensions of the field.

    asked on June 7, 2010
  97. physics

    A person walks 25.0 degrees north of east for 3.80 km. How far would the person walk due north and due east to arrive at the same location? I did the Sin of 25 but the answer was wrong

    asked on September 24, 2009
  98. physics

    A person walks 25.0 North of East for 3.80 km. How far would the person walk due North and due East to the same location?

    asked on September 24, 2009
  99. algebra

    could you please multiply these together and tell me what you come up with..im having trouble coming up with the right answer...im doing something wrong but don't know what!! (-.096t^4+3t^3-27t^2+91t+1700)*(.043t+49)

    asked on February 24, 2008
  100. microeconomics

    A monopsonistic firm, as compares to a perfectly competitive firm, pays _____ wage and hires _____ labor.

    asked on August 18, 2007

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