Most popular questions and responses by Alison
  1. probability

    Consider an image, in which every pixel takes a value of 1, with probability q, and a value 0, with probability 1−q, where q is the realized value of a random variable Q which is distributed uniformly over the interval [0,1]. The realized value q is the

    asked on November 16, 2018
  2. CHEMISTRY!!!=0

    Determine pH of each solution: b) 0.20 M CH3NH3I I did.... CH3NH3^+ +H2O -> CH3NH2 + H3O^+ 0.20 ---------------0--------------0 0.20-x--------------x------------x so i got... ? =x^2/0.20-x i looked up in the back of the book and found the Kb of CH3NH2 to

    asked on March 1, 2012
  3. Chemistry

    An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?

    asked on December 14, 2011
  4. Chemistry!!!

    Consider a solution that is 0.022 M in Fe2+ and 0.014 M in Mg+2. A). If potassium carbonate is used to selectively precipitate one of the cations while leaving the other on solution, which cation will precipitate first? What minimum concentration of K2CO3

    asked on March 21, 2012

    How many kilograms of chlorine are in 24 kg of each of the following chlorofuorocarbons (CFCs)? 1) CF2CL2 express answer using two sig figs how would i solve for this problem??? thanks!

    asked on September 7, 2011
  6. Trigonometry

    Prove identity. Sec(pi-x)=-sec x

    asked on October 23, 2011
  7. probability

    Marie distributes toys for toddlers. She makes visits to households and gives away one toy only on visits for which the door is answered and a toddler is in residence. On any visit, the probability of the door being answered is 3/4, and the probability

    asked on November 24, 2018
  8. Chem!!!:/

    Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain. A). Hg2Br2 B). Mg(OH)2 C). CaCO3 D). AgI I think acid, neutral,acid,neutral ??? Help please!:) thAnks

    asked on March 19, 2012
  9. Chemistry

    The boiling point of another member of this homologous series was found to be 309 K. What is the likely molecular formula for this compound? How many carbon atoms would you expect this new compound to have if its boiling point is between that of a

    asked on March 14, 2011
  10. Science

    Write the half reactions and the balanced equation for the galvanic cell Hg(ℓ)| Hg2(+2)(aq)|| MnO(−4)(aq), Mn2 (aq), H(+)(aq)| Pt(s). What is the smallest possible integer coefficient of Mn(2+)(aq) in the combined balanced equation?

    asked on November 15, 2014
  11. Kate

    Jay, Kay, Ray found themselves far apart for lunch while working in a field. Jay could see Kay, then turned 75 degrees and see Ray. Kay could see Ray, then turn 51 degrees and see Jay. Ray could see jay, then turn 54 degrees and see Kay. Which two were the

    asked on January 27, 2015

    Part A: Maria rented a coat at $285 for 3 days. If she rents the same coat for 6 days, she has to pay a total rent of $510. Write an equation in the standard form to represent the total rent (y) that Maria has to pay for renting the coat for x days. Part

    asked on October 30, 2015
  13. CHEMISTRY!!!=0

    Determine the pH of each solution: (a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the rest. thanks!

    asked on March 1, 2012
  14. trig

    suppose theta is in the interval (90,180 degrees) find the sign of csc(-theta) is it positive or negative = positive???

    asked on September 6, 2011
  15. Physics

    A car rounds a curve with a radius of 25 m at a speed 30 m/s. What is the centripetal acceleration of the car?

    asked on September 22, 2013
  16. math (taylor polynomials)

    Find the degree 3 Taylor polynomial T3(x) of the function f(x)=(7x+50)4/3 at a=2 Find the second-degree Taylor polynomial for f(x)=4x2−7x+6 about x=0 thank you! (:

    asked on November 30, 2011
  17. chemistry

    combustion analysis of a hydrocarbon produced: 33.01 g CO2 and 13.51 g H2O Calculate the empirical formula of the Hydrocarbon. I got CH5 but that doesn't seem right? how do i do this problem?

    asked on September 11, 2011
  18. physics

    A skateboarder travels on a horizontal surface with an initial velocity of 4.4 m/s toward the south and a constant acceleration of 2.0 m/s2 toward the east. Let the x direction be eastward and the y direction be northward, and let the skateboarder be at

    asked on September 29, 2018
  19. Physics

    two identical brass balls mounted on wooden posts initially have different amounts of charge, one plus 3 uC and the other plus 15 uC. The balls are allowed to touch and then separate again. What is the final charge on each ball?

    asked on October 26, 2013
  20. math

    what numbers would you use to estimate the sum of 47 and 21?

    asked on March 29, 2011
  21. Math

    Write an absolute value equation representing all numbers x whose distance from 0 is 17 units.

    asked on September 15, 2017
  22. Social Studies

    What were some reasons for the French and Indian war?

    asked on September 4, 2018
  23. Algebra

    john is three times as old as Greg, and Greg is half the age of Bob, Steve is two times the age of John and Bob combined. if Steve's age is 60, how old is Greg's older cousin Jane, who is two years older than Greg?

    asked on April 14, 2016
  24. chemestry

    what is the electron configuration of lithium after making an octet

    asked on September 29, 2014
  25. Chemistry

    what is the emission spectrum of the sun and what does this spectrum reveal about the types of elements in the sun?

    asked on October 27, 2007
  26. Chemistry


    asked on January 22, 2012
  27. french

    What contributions did the french make to america?

    asked on December 12, 2007
  28. chemistry

    HF hydrolyzes according to the following equation: HF(aq)+H2O(l) H3O+(aq)+F-(aq) When 0.0300 mol of HF dissolves in 1.0 L of water, the solution quickly ionizes to reach equilibrium. At equilibrium, the remaining [HF]=0.0270 M. a.) How many moles of HF

    asked on May 1, 2016
  29. math

    Kalin walks at a steady rate of 3 2/3miles per hour. The beach is 4 1/4 miles from his home. How long will it take Kalin to walk from his home to the beach and back to his home?

    asked on February 6, 2014
  30. chemistry

    If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this

    asked on April 13, 2014
  31. ChemB

    CALCULATE PH OF THE SOLUTION THAT RESULTS FROM EACH SOLUTION A) 150.0mL OF 0.25M HF WITH 225.0 mL OF 0.30M NaF Help please, these buffer questions are confusing.

    asked on March 12, 2012
  32. Further calculus

    1) A price p (in dollars) and demand x for a product are related by 2x^2+6xp+50p^2=10600. If the price is increasing at a rate of 4 dollars per month when the price is 30 dollars, find the rate of change of the demand. 2) a) The price (in dollars) p and

    asked on November 2, 2011
  33. Trigonometry

    Write as an algebraic expression in u. Tan(cos^-1 u)

    asked on October 29, 2011
  34. probability

    Consider a Bernoulli process with parameter p=1/3. Let T1 be the time of the first success and let T1+T2 be the time of the second success. We are told that the results of the two slots that follow the first success are failures, so that XT1+1=XT1+2=0.

    asked on November 26, 2018
  35. ChemB

    A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain. A) HCl B) NaBr C) NaCHO2 D) KCl

    asked on March 12, 2012
  36. maths pre ap

    Krispy Krunch cereal is 49% sugar. about how many ounces of sugar are in a 16 oz box of Krispy Krunch?

    asked on February 9, 2011
  37. chem

    An industrial chemist is studying smAll organic compounds for their potential use as an auto antifreeze. When 0.243g of a compound is dissolved in 25.0 ml of water, the freezing point is -0.201 degree celcius. (A) Calculate the molar mass of compound

    asked on December 14, 2011
  38. Algebra

    A jet plane traveling at 550 mph overtakes a propeller plane traveling at 150 mph that had a 22​-hour head start. How far from the starting point are the​ planes? The planes are ____ miles from the starting point.

    asked on September 17, 2017
  39. Chemistry

    You carefully weigh out 19.00 of powder and add it to 76.95 of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 . The relevant equation is CaCO3+2HCl ----> H2O + CO2 + CaCl2

    asked on September 9, 2011
  40. math

    you are designing a 1000-cm^3 right circular cylindrical can whose manufacture will take waste into account. There is no waste in cutting the aluminum for the side, but the top and bottom of radius r will be cut from squares that measure 2r units on a

    asked on November 28, 2009
  41. Chemistry

    A rxn has delta H ^0 rxn=-112kj and delta S^0 rxn =354 J/K. at what temp is the change in entropy for the rxn equal to the change in entropy for the surroundings?

    asked on April 12, 2012
  42. Math

    Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave

    asked on December 23, 2012
  43. Physics

    Rank the magnitude of the change in momentum of a ball from largest to smallest in the following situations: a) The ball is moving with constant velocity, hits a wall, and stops moving. b) The ball is moving with constant velocity, hits a wall, and bounces

    asked on October 12, 2018
  44. math

    question: find the points at which the graph of x^2 -4x + y62 -6y =12 has a vertical or horizontal tangent line. I found the deriviative to be (x-2)/(3-y) Then, the x value for a horizontal would be x=2 and the y value for a vertical would be y=3. But how

    asked on November 1, 2009
  45. physics

    After 10.3 s, a jogger’s displacement is 360 m. What is the average velocity in m/s? Answer in units of m/s part 2 What is the average velocity in km/h? Answer in units of km/h

    asked on October 1, 2013
  46. CHEM

    a 250.0ml buffer solution is 0.250M in ascetic acid and 0.250M in sodium acetate. B). What is pH after addition of 0.0050mol of HCl? C). What is pH after addition of 0.0050mol of NaOH?

    asked on March 28, 2012
  47. trig

    An automobile windshield washer 10inches long rotates an angle of 60degrres. If the rubber part of the blade only covers the last 9inches of the wiped, find the area of the windshield cleaned by the wiper.

    asked on September 17, 2011
  48. Maths, Life Science, Geography, Business Studies

    What career opportunities are open for me regarding the above subjects?

    asked on February 6, 2015
  49. trig

    find all values of theta in the interval (0,360) that have the given value: sintheta= √2 ______ 2

    asked on September 6, 2011
  50. CHEMISTRY:))))

    A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve

    asked on September 1, 2011
  51. Chemistry

    The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water

    asked on August 30, 2011
  52. physics

    A stone is dropped from the roof of a building; 1.60s after that, a second stone is thrown straight down with an initial speed of 26.0m/s , and the two stones land at the same time. part a. How long did it take the first stone to reach the ground? part

    asked on September 6, 2013
  53. Calculating Averages?

    A certain element has four isotopes. 5.85% of has a mass of 53.93961 . 91.8% of has a mass of 55.934939 . 2.12% of has a mass of 56.93539 . 0.282% of has a mass of 57.93328 . What is the average atomic mass of element ? Express your answer numerically to

    asked on August 29, 2011
  54. Math (linear approximation)

    Find a linear approximation of the function f(x)=(1+x)^(1/4) at a=1, and use it to approximate the numbers (.95)^(1/4) and (1.1)^(1/4). Round your answers to the nearest thousandth Cheers in advance!

    asked on November 29, 2011
  55. CHEM

    Compare the value you obtained from average bond energies: (260Kj) to the actual standard enthalpy of formation of gaseous benzene, 82.9 kj. What does the difference between these two values tell you about the stability of benzene?

    asked on November 8, 2011
  56. Algebra

    A statue is 8ft. tall. The display case for a model of the statue is 18 inches tall. Which scale allows for the tallest model of the statue that will fit in the display case? A. 1 inch: 2 inches B. 1 inch: 7 inches C. 1 inch: 5 inches D. 1 inch: 10 inches

    asked on October 25, 2007
  57. chemistry

    35.6 g of Zn reacts with 87.1 g of Br to produce ZnBr2, the only product, with no reactant left over. How much ZnBr2 could be formed by reacting 156 g of Br? 1. 538 g 2. 45.4 g 3. 382 g 4. 220 g 5. 0.0156 g 6. 0.00262 g

    asked on August 27, 2014
  58. Math

    How to solve: There are 40 chickens and cows in the farmyard. There are 100 legs in all. How many are cows and how many are chickens

    asked on September 16, 2010
  59. Government

    1. The main purpose of a legislature, whether it be the Indiana General Assembly or the US Congress, is to MAKE laws. True False 2. Indiana's two US Senators are Richard Lugar (R) and Dan Coats (R) True False 3. Currently in the US House of

    asked on July 4, 2016
  60. Finance

    Brand Advertising is offered a 3/10 net 40 trade discount by its supplier. In the past Brand has been able to ger away with paying for supplies on credit in 60 days. Since it doesn't have money on hand to take advantage of the discount, it tries to

    asked on April 14, 2012
  61. Chemistry

    A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve

    asked on August 31, 2011
  62. Physics

    A 2000kg car rounds a curve of 65m banked at an angle of 11∘ How much friction force will be required? I know how to find frictional force on a normal flat surface but I don't know how to apply it with a curve. Any help with work would be great!

    asked on September 27, 2013
  63. Statistics

    An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all

    asked on December 17, 2012
  64. trig

    How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

    asked on December 10, 2011

    Suppose that a household's monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, HCF). When graphed, the function gives a line with a slope of 1.75. If the monthly bill fro 24 HCF is

    asked on November 9, 2016
  66. Math

    a carpenter divides a board that is 3.5 inches wide into 4 pieces of equal widthby cutting 3 places. if the width of her saw blade is 1/8 inch, what is the finished width of each piece? What percent of the board length is actullay used?

    asked on May 11, 2016
  67. Physics

    During a head on car crash, the car is designed to slow down as its front end crumples. If a person can survive an acceleration of -33 m/s how far must the front end crumple if the car was initially traveling at 28 m/s?

    asked on June 17, 2013
  68. TRIG

    1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

    asked on October 23, 2011
  69. Chemistry

    Write the formulas of the ions (including charges) present in aqueous solutions of the following: K2CO3 NH4NO3 NA2Cr2O7 Mg(C2H3O2)2 Make sure it is both mass and charge balanced. Here is a listing of many polyatomic ions. This should give you a start. Post

    asked on April 4, 2007
  70. Physics

    A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 132 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity

    asked on February 1, 2014
  71. PHYSICS!!

    I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately

    asked on October 11, 2013
  72. math

    A model of a boat is 1 3/8 feet long. How long is the model of a ship that is 3 times as long, I'd the models are made to the same scale?

    asked on February 11, 2013
  73. Physiology-help please:(

    A child is brought to the speech therapist because she does not pronounce high-pitched sounds (like "s"). Name the sensory organ that is most likely the problem and what area of the organ is being affected? She also experiences extreme dizziness and loss

    asked on July 9, 2012
  74. Chemistry

    Write balanced net ionic equAtions. D) zinc chloride and excess ammonia E) cupric phosphate and lots of ammonia A) ammonia and excess zinc sulfate

    asked on April 8, 2012
  75. Chemistry

    1.CALCULATE pH of 1.0 L 0.010 M ascetic acid and 0.50 L 0.010 M NaOH. 2. Calculate pH of 1.0 L 0.010 M NaOH and 0.500 L 0.010M HCl Buffer help?

    asked on March 15, 2012
  76. Science n math

    What is the molecular geometry n the electron domain for HCN

    asked on February 15, 2012
  77. trig

    find the exact values of the six trig functions of the angle. -750 sin(-750)= cos(-750)= tan(-750)= csc(-750)= sec(-750)= cot(-750)= I've tried this question over and over again and i cannot get it right. i believe -750 is in the fourth quadrant but I'm

    asked on September 6, 2011
  78. Chemistry

    Two of the questions my teacher put on the review sheet for our Acid/Base test are 1) what is the characteristic property of a buffer solution? and 2) what does a buffer solution contain? i think a buffer solution contains a weak acid and its conjugate

    asked on May 15, 2010
  79. math

    find the value for (m) that makes each number sentence true a. 2/3 x 4/5 x m =1/3 b. 4/5 x 2/3 x m =1/3 c.2/3 x 4/5 = 1/3 / m

    asked on February 6, 2014
  80. Math

    A friend claims that the average length of trout caught in this lake is 19 inches. To test this claim we find that a sample of 13 trout has a mean length of 18.1 inches with a sample standard deviation of 3.3 inches. The population standard deviation is

    asked on December 22, 2012
  81. calc

    1)Convert 1/20 of a circle to both degrees and radians. All I have is 9/180 is what I come up with. 2) what fraction of a circle does 3pi/4 represent? Is 1/4 correct? 3) a ferries wheel has cars which move at 1.5mph. If the diameter of the wheel is 600 ft,

    asked on April 28, 2012
  82. Math- calculus

    Suppose f is a function which satisfies the properties: f(x+y)=f(x)+f(y)+x2y+xy2 for all real numbers x and y, and limx→0f(x)x=1. f′(x) thanks in advance!

    asked on September 28, 2011
  83. chem

    A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water until the .100 ml mark. A 60.0ml sample of this glucose soon was diluted to 0.500 L. How many grams of glucose are in 100. ml of

    asked on September 19, 2011
  84. Trig

    how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 45-45-90

    asked on September 15, 2011
  85. trig

    find the next two positive and negative angles coterminal with the quadrantal angle. 90 degrees. would the answer be..... would it be 450, 810?????? and -630, -270 ????

    asked on August 29, 2011
  86. Chemistry

    I know that the more polar the bond between the H and A (if HA is an acid) is, the stronger the acid will be. what does it mean for a bond to be polar? is a bond more polar if it is more electronegative? how are bonds polar and how are bonds nonpolar? what

    asked on May 16, 2010
  87. Accounting

    Rita forms Finch Corporation by transferring land (basis of 125,000; fair market value of 750,000) which is subject to a mortgage of 375,000. Two weeks prior to incorporating Finch, Rita borrows 125,000 for personal purposes and gives the lender a second

    asked on March 4, 2010
  88. math - 6th grade

    how do you do front end estimation when the number of digits are 12,249 - 6,875 dgud wat are the poperties of math and what do they all mean????????? i need help in my homework I haven't used the expression "front end" estimation but I

    asked on September 25, 2006
  89. Math

    Which is an equation of the line that passed through ( 2,-5 ) and ( 6,3 ). A. Y= 1/2X - 6 B. Y= 1/2X C. Y= 2X + 12 D. Y= 2X - 9

    asked on November 3, 2013
  90. Math

    An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

    asked on February 2, 2012
  91. Math

    An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

    asked on February 2, 2012
  92. Trig

    find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?

    asked on September 1, 2011
  93. Trig

    assume A= alpha using complementary rule how do I solve for alpha? cos(2A+40) =sin(3A-60) I don't understand how to start the question. What are the steps in solving for alpha. Do i get cos to equal sin somehow?

    asked on September 1, 2011

    ive done ten sentences, five are verb and five are adjective, please check. 1. Lily bought a pink cat mask for the halloween party. 2. Anna was covering her scar with makeup as she didn't want anyone to make fun of it. 3. Tory dressed up in disguise to

    asked on January 16, 2011

    write 5 sentnces using synomnyns of hide as 5 description and 5 verb. please help, atleast one sentence give to me using one description synonym of hide and one verb synonym of hide all in one sentence.

    asked on January 12, 2011
  96. Chemistry

    A solution of acetic acid having a concentration of about 0.2M is to be titrated using 0.200M NaOH. Select an indicator for the titration. what salt will the solution contain at the equivalence point? what is the approximate concentration of this salt at

    asked on May 15, 2010
  97. MS. SUE/english

    dear ms. sue what is a propositional phrase

    asked on February 19, 2010
  98. English

    I'm fishing for my word that I can use in my essay that would mean free with giving (almost to a fault), where one gives with little regard to where the money goes and what it would be used for.

    asked on January 28, 2010
  99. punnett squares

    how would i make a punnet square to find the offspring of parents: SsYy x ssyy I don't understand what i would put for each of the boxes on the outside

    asked on December 20, 2009
  100. calculus

    how would i find the deriviative of y= x^ (- square root of 2)

    asked on October 29, 2009


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