Questions Asked on
April 19, 2013

  1. STATISTICS

    the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

  2. chemistry

    Baking soda is sodium bicarbonate, NaHCO3, and vinegar is primarily acetic acid, HC2H3O2. When baking soda is added to vinegar, the resulting reaction produces a tremendous amount of gas, as shown in this video. Complete this equation for the reaction of

  3. STATISTICS

    A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

  4. Math ASAP please

    1. Write a function rule for finding the amount of daily pay, p, in the following situation: A bus driver gets paid $100 each day plus $0.20 per kilometer, k. (1 point) 100 = 0.20 × k p = 0.20 × 100 × k p = 0.20k + 100 0.20k = 100 + p 4. Write a

  5. physics

    The period of the musical node E0 is 4.85 × 10-2 seconds. What is the frequency of this note?

  6. Chemistry

    What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.030 M CH3CO2Na? Assume that the volume of the solutions are additive and that a = 1.8 × 10-5 for CH3CO2H.

  7. physics

    Suppose you walk accross a room of length 9 metres with the velocity of one and a half Km per hour. Express this velocity in m/s and find the time you will take to.move accross the room

  8. Mechanics:Statics

    A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.

  9. chemistry

    Balance the following redox reaction by inserting the appropriate coefficients. H^+ +CrO4^2- +NO 2^- =Cr^3+ +H2O+NO3^-

  10. St

    A manufacturer is interested in determining whether it can claim that the boxes of detergent it sells contain, on average, more than 500 grams of detergent. The firm selects a random sample of 100 boxes and records the amount of detergent (in grams) in

  11. math

    A steel tube has an outside diameter of 15 cm, an inside diameter of 13 cm,and is 3.7 m long. What is the volume of the steel contained in the tube in cubic cm is?

  12. precalculus

    The function A=A0e^(-0.0099x) models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 600 pounds of the material are initially put into the

  13. Chemistry - radioactivity

    Hello Dr.Bob. Could you check my work please? I'm not sure if I'm right in how I solved this problem. Which of the following nuclides are most likely to decay via beta decay? A) I-131 B) Pb-206 C) F-18 D) Zr-90 E) Ar-40 I know that nuclides undergo beta

  14. chemistry

    If a solution containing 34.576 g of mercury(II) perchlorate is allowed to react completely with a solution containing 10.872 g of sodium sulfate, how many grams of solid precipitate will be formed?

  15. Math Help?! 7th grade.

    1. Determine which ordered pair is a solution of y = x*2–2. (5, 21), (–5, 24), (–1, –1), (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither.

  16. Science

    Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is

  17. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

  18. Math Geometery

    Is this true? It is possible for two rectangles to have the same area without having the same perimeter??

  19. math

    A child’s kite is on top of a straight pine tree. A ladder is placed against the tree and touches the kite. The ladder forms a 45-degree angle with the flat ground. The base of the tree is 9 feet away from the base of the ladder. With only this

  20. Uof Phoenix

    6x=12

  21. Find the avg rate

    Find the average rate of change f(x)=x^3-3x+9 (a) from -4 to -3 (b) from -2 to 5 (c) from 5 to 9

  22. Algebra

    Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function

  23. Math

    Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

  24. Math

    What is the probability of rolling an even number greater than 2 on a fair number cube? in simplest form

  25. Animal. Homework

    Do male dogs go through heat? My girlfriend asked me to look it up for her school, but neither of us are finding it.

  26. Algebra

    Suppose f(x) is some polynomial such that x−45 is a factor of f(x) . What value of x must be a root of f(x)=0 ?

  27. physics

    Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition was exactly |y⟩. If we run for m+1 additional steps (i.e. total of 2m+1 steps from the initial state), what is the resulting

  28. algebra

    how many pieces of wood each 7 1/2 inches long can be cut from a board that is 45 inches long?

  29. chem

    A hydrogen-oxygen fuel cell operates on the simple reaction given below. H2(g) + 1/2 O2(g) H2O(l) If the cell is designed to produce 1.8 A of current, and if the hydrogen is contained in a 2.9 L tank at 200. atm pressure at 25°C, how long can the fuel

  30. math

    Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

  31. calculus (gr 12)

    The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c)

  32. German

    Decide if the following sentence is grammatically CORRECT or INCORRECT. Ich habe meinem Freund einen Film geholt. correct incorrect

  33. Chemistry

    Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

  34. Algebra 1

    1. How many solutions does the linear system have ? 3x - y = 4 -3x + 11y = 2 2. A line passes through the points (6,4) and (5,-3). What is the equation of the line in point-slope form ? a. x - 6 = 7(y-4) b. y - 4 = 7(x-6) c. y + 6 = 7(x+4) d. y - 6 =

  35. Life orientation

    In 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.provide relevant sourses to support your claim

  36. concept of heatlth

    The Ortho Evra contraceptive skin patch can be worn on any of the following places, EXCEPT the

  37. science

    suppose you are standing on a sidewalk . describe your motion relative to the car and the plane

  38. History

    4. What Reagan policy resulted in an increase in the federal budget deficit? *supply-side economics deregulation increased defense spending increased spending on social programs Thank You.

  39. math

    a life insurance agent is to be paid a commission according to the following scheme : 1000$ in year 1, half the year 1 amount in year 2, half the year 2 amount in year 3, etc. what is the total of the all amounts received by the agent in the first 5 years

  40. xyz

    How large a sample will we need to be able to assert with probability 0. 90 that the sample mean will not differ from the true mean by more then 2.5 units? Assume that it is known from past experience that σ =18

  41. Science

    NEED HELP PLEASE THANK U U R NICE :) Describe how burning fossil fuels has created an imbalance in the carbon cycle. Most people drive cars and heat their homes with petroleum, coal, or natural gas. Why is it important to find alternatives for these

  42. science

    Is the speed of light decreasing? I've heard It is.

  43. chemistry

    two tables containing electron impact mass spectra data are shown. select the molecule that corresponds to the appropriate spectrum A) m/z: 29 57 86 B) m/z: 43 71 86 options for both 3-methyl-2-butanone, 3-pentanone, acetone, benzene

  44. accounting

    Customer relations are usually part of:

  45. Algebra

    Find the specified value of the following functions and state the domain of each one. f(x)=x-11;g(x)=7x^2 (a) (f+g)(5)=

  46. Life Orientation

    Name two community organizations that sre involved in supporting or giving redress to environmental factor

  47. Chemistry - electron configuration

    Hello Dr.Bob. Could you please take a look at the following question? I know the correct answer for it, but I'm not sure how to go about solving it. Which ground state electronic configuration will most readily ionize to a 2 + cation? A)

  48. Chemsitry

    Nitrogen dioxide, a pollutant in the atmosphere, can combine with water to from nitric acid. One of the possible reactions is shown below. Calculate ∆G0 and Kp for this reaction at 25oC and comment of on the spontaneity of the reaction (MUST plot the

  49. math

    If the mean of a certain population is 180 and the standard deviation is 38, what x value corresponds to the z-score of -0.27.

  50. Science-Chemistry

    Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH of the initial methyl

  51. PLEASE HELP! college algebra

    Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function

  52. Algebra

    For the given equation, list the intercepts and test for symmetry. 2+y-121=0 Show tests algebraically

  53. math

    what is the approximate diameter of a 31 in basketball?

  54. math

    what is 1000 [?] 81 [?] 190 = 10

  55. Statistics

    how can I determine weather to reject or fail to reject the following nul hypothosis: let a= o.01, data: s= 3.1, n=55 and H(0) st dev 2.8 and H(1)< 2.8

  56. Algebra 1

    Rena has to pay the first $100 of her medical expenses each year before she qualifies for her insurance company to begin paying. After paying the $100 "deductible," her insurance company will pay 80% of her medical expenses. This year, her total medical

  57. Geometry

    One pizza has a diameter twice the diameter of a smaller pizza. what is the rato of the area larger pizza to the area of the smaller pizza?

  58. Statistics

    how can I decide to reject or fail to reject the following null hypothesis? let a= 0.05,data; p=0.69, n=32, test statistic z= 0.09095 H(0);p=0.68 H(1)p>0.68

  59. Math

    I really need help please!! Karen, Gavin, Nasra, and Ali each have a deck of cards. Each student randomly draws a card from the deck. Find the probability of each event. a) each student draws a club. b) Karen draws a red card, Gavin draws a king, Nasra

  60. algebra

    Charlene made the sketch below in order to find the height x of a pole. She positioned a mirror on the ground so that she could see the reflection of the top of the pole. Her height, her distance from the mirror, and her line of sight to the mirror

  61. Math

    Calculate the mass of water in kg and tonne contained in a rectangular tank with the following dimensions: width of 3.2000 metres height of 2.000 metres length of 8.000 metres. (Round answers to 3 decimal places) Answers: l= 8.000 1 tonne= 1000 kg w= 3.200

  62. English urgent please:)

    I wrote the thesis but wat do i make the conclusion be...:( This is my thesis: Aldous Huxley's Brave NEw World and Emily Bronte's, "wuthring heights" describe a major struggle of being an individual again society . in Aldous Huxley's novel "Brave New

  63. chemistry

    How many mL of 0.100M HCl are needed to neutralize 49.0mL of 0.104M Ba(OH)2 solution?

  64. science

    find out the volume of 0.05M HCL requred, in ml,in order to neutralise 0.2M Naoh of 40 ml.

  65. Math

    Find the total surface area of a closed cylinder having a diameter of 1.000 m and 15.000 mm and a length of 12.000 m and 55.000 mm. (Round the answer to 3 decimal places) 1 m = 1000 mm Total surface area= pi*D*h+2*(0.7854*D^2)

  66. PHI103:

    You should read this book. Everybody likes it so it must be good" may commit which fallacy?

  67. chemistry

    A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

  68. chemistry

    what is the change in temperature if 24g of water at 50 degrees C absorbs 985j of heat energy

  69. chemistry

    A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

  70. Grammar (Ms. Sue)

    Complete each sentence, using a nominative pronoun. Identify how the pronoun is used in the sentence. 1). Yesterday, my little sister Jessica and(?) played hopscotch on the sidewalk. 2). It was (?) who drew the hopscotch board with chalk. 3). (?) collected

  71. physics

    a .300 kg piece of metal is heated to 88 degrees celsius and placed in a copper calorimeter with a mass .150 kg which contains .500kg which contains .500 L of water that are both initially at 12.6 degrees celcius. Over short period of time the mixture

  72. Western Civilization

    need a good simple to understand resource to explain why the early 20th Century experienced a surge of changing role of art in society. Will need to define the modern art movement and give examples of individuals, the type of art they created and how they

  73. english

    Which of the following sentences is correctly punctuated? A. The company held it's annual party at the convention center. B. Mr. Jones visited the YMCA before becoming a member. C. The local police asked the F.B.I. to assist with the case. D. Mary

  74. Social Studies 10

    What was the future BC called in the early 1800s? What challenges did George Simpson encounter when he became governor of the HBC in 1826? Compare American and British attitudes toward the Oregon Territory (Similarities, Differences...)

  75. Grammar (Ms. Sue)

    Complete each sentence below, using an objective pronoun. Then, tell how each pronoun is used in the sentence. 1). Skipping rope is a good form of exercise. Some athletes use (?) in their jumping. 2). My sister loves to jump rope. It gives (?) a chance to

  76. physics

    You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity? Explain.

  77. Probability

    If 5 juniors and 4 seniors apply for a job at a school which has 2 openings, what is the probability that 1 junior and 1 senior will be randomly chosen for the job.

  78. physics

    Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor

  79. physics

    How does friction slow down a moving object — for example, a soccer ball?

  80. Social Studies 10

    What was the future BC called in the early 1800s? What challenges did George Simpson encounter when he became governor of the HBC in 1826? Compare American and British attitudes toward the Oregon Territory (Similarities, Differences...)

  81. Chemistry

    Find the pH of each mixture of acids 1) 0.115M in HBr + 0.125M in HCHO2 2) 0.050M in acetic acid + 0.050M in hydrocyanic acid

  82. physics

    Two charges separated by a distance of 1 m exert a 1.0N force on each other. If the changes are pulled to a 3-m separation distance, the force on each charge will be

  83. arithmetic

    a flower floats on the surface of lake water. its level above the lake surface is 5.5 cm. then a sudden gust of wind comes and flower sinks 10 cm far from its original point, what is the depth of lake at the point where the flower was floating

  84. Life orientation

    Suggest 5 recommendation on how to address the environmental problems within your community or any other community within south Africa and globally.

  85. biochemistry

    What is the number of ATP molecules produced by the beta oxidation of eicosanoic acid?

  86. algerbra

    solve the equation step by step list each step along with the property you used during that step -5*1*11*4

  87. Intrest?

    1. Find the total amout if you deposit $600 at a rate of 5% for 2 years compounded anually. 2. Find the total amout if you deposit $800 at a rate of 8% for 4 years compounded anually.

  88. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

  89. Math

    Ms Perez owns 2 properties in different towns. The 1st property is assessed at $125,000 and has a tax rate of $6.35 per 1000 dollars. The 2nd property has the same assessed value, but is taxed at the rate of $0.00587 per dollar. Derive the solution to the

  90. Chemistry

    What is the (a) molality, (b) freezing point, and (c) boiling point of a solution containing 2.29 g napthalene (C10H8) in 44.6 g of benzene (C6H6)?

  91. physics

    A 1400 kg car traveling at 15.5 m/s to the south collides with a 4100 kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after the collision. What is the final velocity of the two-vehicle mass?

  92. physics

    A gasoline engine absorbs 20990 J heat and performs 4166 J mechanical work in each cycle. Find the amount of heat expelled in each cycle. Answer in units of J

  93. physics

    A proton travels with a speed of 3.39×106 m/s at an angle of 56.8 ◦ with a magnetic field of 0.305 T pointed in the y direction. The charge of proton is 1.60218 × 10−19 C. What is the magnitude of the magnetic force on the proton? Answer in units of

  94. sociology

    3. If all of a company’s Filipino employees sit together for lunch, sociologists would say they have formed their own __________. (Points : 1) diversified group outgroup ingroup ethic group

  95. social

    __________ experienced the Great Depression

  96. Algebra 2

    Find the sum [1 4] [0 0] [0 3] + [0 0] A - [1 4] [0 3] B - undefined C - [0 0] [0 0] D - [1 0] [4 3]

  97. college algebra

    1.write the formula for the function that has degree 3 and zeros of -1,2 and 5 with a lead coefficient of 1? (leave answer in factored form) f(x)= 2. Write the formula for the function that has degree of 4 and zeros of -4, 3(multiplicity 2) and 4 with a

  98. statistics

    The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?

  99. Chemistry

    A 17.6ml sample of a monoprotic acid is titrated with 0.212M NaOH. If 69.2ml of base is required to reach the equivalence point, what is the concentration of the acid?

  100. Science speed help

    Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor.

  101. bege101

    State the distinguishing features of Literature as a mode of language use by citing examples

  102. Chemistry

    The of hydroxylamine, , is . A buffer solution is prepared by mixing 120 of a 0.34 hydroxylamine solution with 60 of a 0.25 solution.Solve for the PH

  103. Algebra 2 variables

    Find the values of the variables. [-12 -w^2] = [2k -81] [2f 3] [-4 3] Show your work?

  104. Science

    An electromagnet is ____. A. a permanent magnet B. made with bar magnets C. able to attract all metal substances D. only operating when the current is on I think it is D..?

  105. chemistry

    Predict the first order splitting patterns of the indicated proton in the following molecules: CH3CH2CH3 (the H in CH2 is selected) a) quintet b) quartet of quartets c)septet

  106. Life Orientation

    describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

  107. math

    a two digit number * 7 is multipule by three digit number * * 3 the digit in the place are not neccessararliy the same which of the following can be the product of the two numbers ?

  108. Algebra

    Simplify (√7 + 8)(√63)

  109. physics

    A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20 kilometers/hour. Find the resultant velocity of the plane

  110. math

    the length of the base of a triangle is smaller than its base.the area of triangle is 1/2x^2+2x+3/2.what is he length of he base

  111. Math Geometery

    Is it possible for two rectangles or squares to have the same area, but only if they have the same perimeter??

  112. math

    at a shopkeper advertise buy two get one free what is the discount percent?

  113. Science

    A period of inactivity in the summer months due to the hot, dry weather is called _______ and is a(n) _______ adaptation.

  114. math

    if a+b multiply c=7then c=?

  115. math

    in the given equation find the value of variable m 17m-3/2=5m+14

  116. Math

    The formula y=1+1.4ln(x+1) models the average number of free-throws a basketball player can make consecutively during practice as a function of time, where x is the number of consecutive days the basketball player has practiced for two hours. After how

  117. Algebra

    Evaluate the determinant of the matrix. [-4 5 6 0 4 4 -2 -5 4]

  118. physics

    A rubber chicken of mass 45.0 kg is pulled along a horizontal surface by a rope that makes an angle of 32.0 with the horizontal. If the coefficient of friction is 0.113 and the tension in the rope is 95.0 N, what is the acceleration of the object?

  119. chemistry

    Write the net ionic equation (including phases) that corresponds to Fe(ClO4)2(aq)+Na2S(aq)=FeS(s)+2NaClO4(aq)

  120. precalculus

    the value of a particular investment follows a pattern of exponential growth. In the year 2000, you invested money in a money market account. The value of your investment t years after 2000 is given by the exponential growth model A= 6200e^(0.018(t)). When

  121. Maths

    There are two complex roots to the quadratic equation z^2 +(1−16i)z+(−80+10i)=0 . What is the value of the larger of the two norms of the two roots?

  122. Maths

    Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

  123. Numbers

    What is the smallest possible natural number x>5 , that leaves a remainder of 5 whenever it is divided by 14 , 8 or 77

  124. Math

    Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

  125. Ratios

    If the ratio of x+y to x−y is 279/262 , then the ratio of y to x can be written as a/b where a and b are coprime positive integers. Find a+b

  126. real estate finance

    The annual insurance premium on Maria Snyder's house is $2,074 and the annual property tax is $1,403. If her monthly principal and interest payment is $1,603, find the adjusted monthly payment including principal, interest, taxes, and insurance (PITI).

  127. Inequality Sum

    x,y and z are positive integers such that x

  128. Sigma over Phi

    Let σ(n) be the sum of the positive divisors of an integer n and ϕ(n) be the number of positive integers smaller than n that are coprime to n. If p is a prime number, what is the maximum value σ(p)/ϕ(p)?

  129. GEOOOOMETRY!!!!!....Angled Perimeter

    ABCD is a quadrilateral with ∠ADC=∠ACD, ∠ACB=∠ABC and CD=7. If triangles ADC and ABC have perimeter 51 and 59, respectively, what is the value of BC?

  130. P&P

    Peter is walking from the library to school at a rate of 40 meters per minute. At the same time, Paul is walking from school to the library. After they meet each other, Peter still needs 6 minutes to get to school, while Paul is 200 meters away from the

  131. Isoceles Angle Bisector

    Triangle ABC is isosceles with AB=AC. D is a point on BC such that AD bisects ∠BAC. What is the measure of ∠ADB (in degrees)?

  132. math

    Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

  133. Life Orientation

    describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

  134. math

    Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

  135. Algebra

    Let S be the sum of all values of r such that the coefficient of the x^2 term in the expansion of (x−3)(rx+2)^3 is −6 . If S=a/b, where a and b are coprime positive integers, what is the value of a+b

  136. math

    Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

  137. Trigonometry

    Let O be the origin and P be a point in the fourth quadrant on the x-y plane. Let 270

  138. geometry!!!.....Alice's Concession Choices

    Alice is at a country fair with 4 concession stands. She cannot decide in which order to visit each concession stand. Assuming she visits each stand once and only once, how many different ways are there to visit all the concession stands

  139. Trigonometry

    Given that tan84=T , how many solutions are there to tanx=T in the domain [0,1000] ?

  140. Economics(Please check, thank you)

    Is leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct?

  141. chemistry

    To what volume should 100ml of any weak acid (HA) with a concentration of 0.2M be diluted to double the percentage ionization?

  142. statistics

    A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the

  143. chemistry

    A reaction produced 0.40 mmol of H in a buffered solution which contained 300ml of 0.06M succinate buffer, pH is 4. What was the pH of the medium after the reaction was completed? The pKa of succinate buffer is 4.21

  144. Math

    Find the sum of all primes q

  145. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

  146. Maths

    If the quadratic kx^2−14x+1 is a perfect square polynomial, what is the value of k

  147. English

    As I looked at that photograph

  148. physics

    Consider the Hamiltonian H=Z⊗3 acting on 3 qubits. What is the ground energy of the system? (I.e. the lowest eigenvalue of H?) What is the dimension of the ground energy subspace? (I.e. multiplicity of that eigenvalue?) Which of the following correctly

  149. SCIENCE???????/

    a region has a geothermal gradient of 180 ˚C km^-1.what type of metamorphism will occur at a pressure of 1.2×10^8 pa? answer the question by completing the sentence below. In these condition there would be ........??? metamorphism. I would appreciate if

  150. accounting

    features of king code iii

  151. physics

    Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −. Write M in the standard basis. If M is the Hamiltonian acting on a qubit which is in the

  152. Physics

    The Frequency Of an Electromagnetic Wave Is 6x(10x16) What Is IT wavelength In air..?

  153. math

    If you roll a number cube 36 times, how many times do you expect to roll an even number?

  154. Statics

    Two identical spheres of radius 80mm and mass 2 kg on the surface of the earth are placed in contact. Find the gravitational attraction between them.

  155. Mechanics:Statics

    Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.

  156. life orientation

    what are the impact of teenage pregnancy in the community.

  157. life orientation

    provide five ways in which you critically discuss how life style disease impact on the teenager

  158. Social Studies.. PLEASE HELP!! :(

    How were the workers compensated for their labor in the North and South during 1800 to 1860?

  159. 5th grade math

    One patern called for 2/3 of a yard of lace, and another pattern called for 5/9 of a yard of lace. In simplest form, how much more lace did the first pattern call for than the second?

  160. Math

    Using a ruler to draw a square with a perimeter of 48ft, and using the scale 6ft=1/2in (Hint: to find the length of each side, divide 48ft by 4). How should this problem look?

  161. Life orientation

    How drugs can impacts on the community

  162. civics

    six inter communal conflicts in nigeria

  163. Algebra

    Simplify the expression 0.2y3+0.3y3+0.1y3 use integers or decimals for any numbers in the expression.

  164. Physics *Electrical Scientist* please help me!!!

    * JJ Thompson * what was he credited for discovering the cathode ray tube? * How does his experiment relate to electrostatics? >>PLease help me!!!! :)

  165. calculus

    Evaluate each of the following. Show all your calculations. f'(3) if f(x)  = x^4 − 3x

  166. calculus (gr 12)

    Evaluate each of the following. Show all your calculations. f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8

  167. calculus

    Evaluate each of the following. Show all your calculations. f" (−3) if f(x)  = 4x^3 − 3x^2 + 2x − 6

  168. Grade 12 Calculus

    Evaluate each of the following. Show all your calculations.  f" (1/3) if f(x) = −2x^5 + 2x − 6

  169. Chemistry

    The structures of NO and NO2 possess similarity to free radicals. How are they similar in electronic terms?

  170. Grade 12 Calculus

    Evaluate each of the following. Show all your calculations.  f" (0) if f(x) = 14x^2 + 3x − 6

  171. life orientation

    give five ways in which the human or environmental problem impacts on the community

  172. life orientation

    give five ways in which the human or environmental problem impacts on the community

  173. grammar

    The song You Are My Sunshine always cheers me up. (1 point)

  174. Life orientation

    In 10-15 lines whaj are 5 ways in which the human or environment problem impact on the community?

  175. Life orientation

    How to address the teenage pregnancy?

  176. Math

    The volume of the triangular prism is 30 cubic units. How do I determine the area of the base in square units?

  177. Math

    The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth $2,600. Five years after it was bought, it was worth $2,000. If the relationship between number of years past 1998 and value of the

  178. Science

    How to report an experiment of Specific heat of a liquid.

  179. managerial math

    a gift of $3000 a grew $7,000,000 in 200 years. At what rate compounded anually would this growth occur

  180. Science

    1. Density is the relationship between ____. (1 point)

  181. algerba 2

    the length of a rectangle is (x-2)squared and the width is (5x+1) what is the perimeter of the rectangle

  182. Science

    Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the release of energy

  183. SIcene

    Three examples of physical change are ____. (1 point) boiling water, a nail rusting, and a melting candle a pond freezing, breaking glass, and a burning candle melting ice, mowing the lawn, and carving a statue applying lipstick, making lemonade, and

  184. Please help me

    Suppose a customer brings a gold bracelet to a jeweler and asks for it to be changed into a gold ring. Which of the following is true? (1 point) The physical property of color will be changed. The bracelet will go through a chemical change. The composition

  185. social civics

    Ambassador (a.) are most often recruited in the United States from the career diplomatic service (b.) have a legislation as their headquarters in a foreign country (c.) perform the same functions but have a higher rank than ministers

  186. Mrs.Sue Please help me

    Hi mrs. sue! I cant figure out the answer please help! Which of the following explains how water causes rocks to weather? (1 point) Water can melt rock material. Water freezes in the cracks and expands, causing breaks. Water reacts with the rock and

  187. Physics

    6. When a mass is attached to a spring, the period of oscillation is approximately 2.0 seconds. When the mass attached to the spring is doubled, the period of oscillation is most nearly a) 0.5 s b) 1.0 s c) 1.4 s d) 2.0 s e) 2.8 s

  188. Math

    ues the disruptive property to rewrite the expression. (d+8)6= Simplify you answer.