# alison

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

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

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?

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

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!

6. ## Trigonometry

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

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

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

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

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?

11. ## ALGEBRA

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

12. ## 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

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!

14. ## trig

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

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?

16. ## 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?

17. ## 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

18. ## 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! (:

19. ## 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?

20. ## Math

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

21. ## chemestry

what is the electron configuration of lithium after making an octet

22. ## 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?

23. ## math

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

24. ## Social Studies

What were some reasons for the French and Indian war?

25. ## Chemistry

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

26. ## Chemistry

THE RATE LAW FOR THE REACTION 2NO + 02 = 2NO2 IS FIRST ORDER IN OXYGEN AND SECOND ORDER IN NO. PROPOSE A MECHANISM IN WHICH EACH STEP IS BIMOLECULAR. SPECIFY THE SLOW STEP. I HAVE NO IDEA WHAT TI DO. HELP PLEASE? THANKS.

27. ## french

What contributions did the french make to america?

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

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?

30. ## Trigonometry

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

31. ## 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

32. ## 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.

33. ## 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

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.

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

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?

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

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.

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

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

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?

42. ## 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

43. ## 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

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

45. ## 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?

46. ## 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

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.

48. ## trig

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

49. ## Maths, Life Science, Geography, Business Studies

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

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

51. ## 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

52. ## 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

53. ## 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

54. ## 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

55. ## 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!

56. ## 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?

57. ## 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

58. ## 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

59. ## 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

60. ## Math - APPRICIATE ALL HELP!

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

61. ## 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

62. ## 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

63. ## 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!

64. ## 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

65. ## trig

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

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?

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?

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!

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

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

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

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?

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

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

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?

76. ## Science n math

What is the molecular geometry n the electron domain for HCN

77. ## 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!

78. ## 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

79. ## 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

80. ## 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

81. ## 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

82. ## 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,

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

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

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 ????

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

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

88. ## math - 6th grade

how do you do front end estimation when the number of digits are different....like 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

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

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

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

92. ## Trig

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

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?

94. ## ENGLISH

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

95. ## ENGLISH

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.

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

97. ## MS. SUE/english

dear ms. sue what is a propositional phrase

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.

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