Questions Asked on
March 14, 2013

  1. math 7

    Mary had a bag that contains 9 green marbles, 7 red marbles, and 8 blue marbles. whats the prob that Mary will draw a green or red marble\

    asked by rockrboiluvr
  2. geochemistry

    Been trying to balance this equation for a while, but can't get the right answer. any help would be apperciated! CH2O (aq) + NO3 - ---> N2 + HCO3 - + CO2(g)

    asked by jason
  3. Chemistry

    48g of ice at its melting point is heated with steam at its condensation point. The final temperature of the system is 50 degree Celsius. How much steam was used to melt the ice? q=(48g)(1mol/18g)(50-0C)(0.97kcal/mol*C) = 129kcal Not sure where to go from

    asked by Sarah L.
  4. word problem

    juan bought 12 oranges and ate 1/4 of them carla bought 12 oranges and ate 1/3 of them . which ate more

    asked by ricky
  5. science

    Describe how you would go about making 1200mL of 0.100 Molarity HNO3 from a concentrated solution that is 12 Molarity?

    asked by Nicole
  6. Math

    Can in a Cone Find the volume of the largest can that can fit entirely under a cone with volume 900 cubic cm. 1.draw pictures of at least THREE different cases (including the endpoints if any). 2. define all variables CLEARLY (with words) and then use

    asked by jonh
  7. PHYSICS

    Example 2: a) A desk has a mass of 68.75 kilograms. If the coefficient of static friction between the desk and the floor is 1.1, what force must be used to move the desk from rest? b) Once the desk above is in motion, what force must be used to keep it

    asked by Anonymous
  8. Chemistry

    Describe how a buffer behaves. Your description should include an explanation of why the addition of NaOH to the HAc solution formed a buffer. What happens to the pH when a small quantity of a strong acid or base is added to a buffer solution? What happens

    asked by Terrell
  9. physics

    assume that a 50 kg skater on level ice has built up her speed to 30km/hr.how far will she coast before the sliding friction dissipates her energy? assume the friction coefficient is 0.01.

    asked by chingtham
  10. life orientation

    Discuss 5 way in which the human or enviromental problem impacts on the community

    asked by asnath
  11. physics

    a 70 kg astronaut is loaded so heavily that he can jump only to a height of 10 cm on earth.how far can he jump on the moon?

    asked by chingtham
  12. Life orientation

    Dxuscuss 5 way in which the human or invromental problem impact on the community

    asked by Rose
  13. physics

    from what height can a 1 kg falling object cause fracture of the skull?assume that the object is hard and the area of contact with the skull is 1 cm sq. and that the duration of the impact is 10^-3 sec.rupture strength for skull is 10^8N/m^2

    asked by chingtham
  14. maths-trignometry

    The value of (secpi/7)+(sec3pi/7)+(sec5pi/7) is

    asked by anoynomous
  15. Physics

    Suppose that the light bulb in the figure is a 61.8-W bulb with a resistance of 218 Ω. The magnetic field has a magnitude of 0.37 T, and the length of the rod is 0.59 m. The only resistance in the circuit is that due to the bulb. What is the shortest

    asked by Elizabeth
  16. PHYSICS

    Suppose that the magnetic field in the figure below has a magnitude of 1.1 T, the rod has a length of 0.86 m, and the hand keeps the rod moving to the right at a constant speed of 3.4 m/s. If the current in the circuit is 0.044 A, what is the average power

    asked by Andrea
  17. Physics PLEASE HELP!

    A flat circular coil with 97 turns, a radius of 4.04 10-2 m, and a resistance of 0.528 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate

    asked by Nixon
  18. math

    Calculate without using tables or calculators log 450 and log 324 given log 2 =0.3010 and log 3 =0.4771

    asked by John Makotamo
  19. statstics

    The lengths of the eggs of a species of bird are roughly normally distributed, with a mean of 32 mm and an SD of 1.2 mm. 1.Approximately what is the 99th percentile of the lengths? Give your answer in mm but please do not enter the units. 2.Approximately

    asked by ellas
  20. business

    What are the core business activities of absa ,nedcor and anglo american listed on top of the jse csr index?

    asked by Ntebo matla
  21. Math

    Approximately 50% of the eggs have lengths in the range 32 mm plus or minus ____________ mm

    asked by Shoab
  22. University Physics

    In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the overhead view of Fig. 5-33. The tire remains stationary in spite of the three pulls. Alex pulls withe force Fa of magnitude 220N

    asked by Brandon Ochoa
  23. science

    If the block has a mass 12.3 kg and slides a distance of 6.9 m down the inlcine, calculate the distance x the spring is compressed if the coefficient of kinetic friction between the block and the incline is 0.3 and the spring constant is 17.4 N/m. Input

    asked by xolani
  24. Physics (Buoyancy)

    A Cuboid with lenght as 6m and breadth as 3m, is floating in a lake. A man comes and sits on it and it sinks 1cm, then find the weight of the man. (Take g=10 m/s -2)

    asked by Krishnam Kumawat
  25. precalculus

    A rectangular field is to be enclosed by a fence and divided into three equal rectangular parts by two other fences. find the maximum area that can be enclosed and separated in this way with 1200m of fencing.

    asked by jeremy
  26. English

    Does this sentence need any other puncation than a period at the end. Fred said the distributor cap on my car is cracked.

    asked by Bernie
  27. math

    Find inverse of [1/(x-2)]+3 and 2(x-4)^2 + 5

    asked by Elbert
  28. math

    for what value of k are the roots of the quadratic equation (k+4)x*x+(k+1)x+1=0?

    asked by raj
  29. Business Math

    Oakwood plowing company purchased two new plows for the upcoming winter. Oakwood must make a single payment of 25,03 to pay for the plows. As of today he has $24,200. Asuume the Oakwood puts the money in the bank today, what rate of interest will it need

    asked by Donna
  30. Physics

    A worker drives a 0.460 kg spike into a rail tie with a 2.16 kg sledgehammer. The hammer hits the spike with a speed of 64.5 m/s. If one third of the hammer’s kinetic en- ergy is converted to the internal energy of the hammer and spike, how much does the

    asked by Ted
  31. algebra

    The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is 50 amps when the resistances is 20 ohms. What is the current when the resistance is 60 ohms?

    asked by Anonymous
  32. Physics

    The amount of internal energy needed to raise the temperature of 0.26 kg of water by 0.3C is 326.5 J. How fast must a 0.26 kg baseball travel in order for its kinetic energy to equal this internal energy? Answer in units of m/s

    asked by Ted
  33. chemistry

    10g of silver nitrate solution is added to 10g sodium chloride solution? what change in mass do you except after the reaction and why?

    asked by nitin jangid ,palwal
  34. math

    Calculate the lenght of a rectangle with area 350cm and breadth 50mm.

    asked by Nelly
  35. math

    Calculate the breadth of a rectangle with lenght 120mm and area 960m

    asked by Nelly
  36. math

    Calculate the breadth of a rectangle with lenght 120mm and area 960m

    asked by Nelly
  37. Math

    Calculate the side lenght of square with area 25m

    asked by Nelly
  38. chem

    calculate the volume of dinitrogen tetrafluoride that has the same number of atoms as 10 L of argon under the same pressure ans temperature

    asked by Anonymous
  39. Math

    Calculate the area of a triangle with base equal to 18cm and height equal to 9cn

    asked by Nelly
  40. Math

    Calculate the height of a triangle with base equal to 142cm and area equal to 62,48cm

    asked by Nelly
  41. Statistics

    As reported in Runner's World magazine, the times of the finishers in the new york 10 km run are normally distrubted with a mean of 1.02 hours and a standard deviation of 9 minutes. Let X denote finishing time for the finishers. Then, A. Find the

    asked by Anonymous
  42. stats

    Opisthotrochopodus n sp. is a polychaete worm that inhabits deep sea hydrothermal vents along the Mid-Atlantic Ridge. According to an article by Van Dover et al. in Marine Ecology Progress Series (1999, vol 181 pp 201-214), the lengths of female polychaete

    asked by Anonymous
  43. Chemistry I

    If 30.0 mL of 0.2 M nitric acid and 30.0 mL of 0.25 M solution of sodium hydroxide are mixed, what is the molarity of sodium nitrate? Assume that total volume of the solution after mixing is equal 60.0 mL.

    asked by Therese
  44. calculus

    The total number of people infected with a virus often grows like a logistic curve. Suppose that 15 people originally have the virus, and that in the early stages of the virus (with time,t , measured in weeks), the number of people infected is increasing

    asked by Anonymous
  45. biomechanics

    you are trying to lift a 10 kg dumbbell by pulling upward on it with a 108.1 N force. what wil lthe acceleration of the dumbbell be as a result of this force?

    asked by Anonymous
  46. Physics 11th Grade "HEAT' 2

    1) Emily is testing her baby's bath water and finds that is too cold,so she adds some hot water from kettle on the stove. If Emily adds 2.00 kg of water at 80.0 degree celcius to 20.0 kg of bath water at 27.0 degree celcius , what is the final temperature

    asked by Isis
  47. math

    Jack and Diane went to the movies. They each paid the same amount for an admission ticket. Together, they spent $12 on snacks. The total cost of admission and snacks for Jack and Diane was $26. How much was each admission ticket? Choose a variable. Write

    asked by Cherie
  48. Math: Please check

    A playground is shaped like a rectangle with a width 5 times its length (L). What is a simplified expression for the distance between opposite corners of the playground? A.) L square root 26 B.) 5L C.) 26L^2 D.) 6L Thanks

    asked by Jim
  49. Electronics

    Two resistors of 15ohms and 5ohms are connected in parallel.this parallel combination is connected in a series with a third resistor of 10ohms.the whole circuit is then connected across a 40 volts supply. 1.determine the resistance of the circuit. 2.the

    asked by Hellen
  50. Physics

    13. The graph at right shows the angular velocity as a function of time for the blade of a fan. The blade moves in a circular path. a. If θ = 0 rad at t = 0 s, what is the blade’s position at t = 1.5 s? b. At what time will the blade have completed 11

    asked by Anonymous
  51. Math: Please check

    Simplify: -11 square root 112 *A.) -44 square root 7 B.) -176 square root 7 C.) -27 square root 7 D.) 4 square root 7 Thank You

    asked by Jim
  52. Derivatives

    what is derivative of sin^2 (3x-1)^2 ? dy/dx (sin^2 (x))= 2 sin x cos x dy/dx (3x-1)^2= 6(3x-1) chain rule? = 2 sin ((3x-1)^2) cos ((3x-1)^2) * 6(3x-1) Please help. Thank you

    asked by Mark
  53. math problems

    ã7/11 rationalize the denominator and simplify

    asked by tora
  54. stats

    scores on a university examination are normally distributed with a mean of 68 and standard deviation of 9. What percetnage of students scores above 77? The answer is 16% according to the professor that is correct. But I don't understand how the professor

    asked by Anonymous
  55. algebra

    For the years 2010 to 2050, the projected percentage P of the U.S. population that will be 18 to 24 years old during year t is estimated by P= -0.025t+ 60.35. complete the table t 2010 2020 2030 2040 2050 p use the table to find the year when the

    asked by tee
  56. Life Orientation

    what,according to the Basic conditions of employment Act applies wiht regard to the contraventions that you've identified?

    asked by Lerato
  57. Chemistry

    A solution has a mass of 95.00g and a density of 2.147 g/mL. What is the volume of the solution?

    asked by Alice
  58. PHYSICS

    Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is: A skier with a

    asked by Anna
  59. calculus

    A new college textbook edition typically generates most of its sales in the year of its publication. Sales drop off in subsequent years as a result of competition from the used book market. Suppose that the annual sales of a particular textbook may be

    asked by bobbi33
  60. calculus

    R(t) = −131t − 749.5 million dollars per year and the rate of change in the annual operating profit may be modeled by P(t) = 12t + 76 million dollars per year, where t is the number of years since the end of 1999. Determine the accumulated change in

    asked by bobbi33
  61. physics

    A parallel capicitor is made of two plates with cross sectional area A which are separated by a distance d (with a vacuum between the plates). The capacitor is connected to a battery until a charge Q is stored on it and a total potential difference VC is

    asked by k
  62. Cal

    Differentiate the function. f(x) = sin(x) ln(2x)

    asked by Dee
  63. Help Ms.Sue Please

    1.Find the lateral area of a cone with a radius of 7 ft. and a slant height of 13 ft. Use 3.14 for ð and round to the nearest tenth. 439.6 ft2 324.5 ft2 571.5 ft2 285.7 ft2 2.Find the surface area of a square pyramid with a base length of 24 cm and a

    asked by Deliah
  64. Cos-Derivative

    y= (cos^3 x) (cos 3x) I got -3 sin(3x) cos^3x - 3 sin(x) cos (3x) cos^2 (x) using the product rule Is this right? Thanks.

    asked by Mark
  65. science

    A ball dropped from a height of 10m loses 40% of its energy after impact on ground. How much height will it gain after one impact?

    asked by pinki
  66. science

    A ball dropped from a height of 10m loses 40% of its energy after impact on ground. How much height will it gain after one impact?

    asked by pinki
  67. chem 101

    75.0 G tartaric acid in 1 liter is what molarity (moles/liter) mw= 150.087g/mol

    asked by alain
  68. maths-stastics

    Find the mean for the following data variable=4,6,8,10,12 freqency=4,8,14,11,13

    asked by anoynomous
  69. Electronics

    Rseries=R1+R2 =15ohms+10ohms =25ohms

    asked by Hellen
  70. Calculus

    If f(3)=−3, g(3)=9, f′(3)=1, and g′(3)=2, Find (f/(f−g))′(3).

    asked by Travis
  71. inequality

    find the solution to the following inequality 2(2x-6)>x+3, then graph the solution.

    asked by joe
  72. chemistry

    In a measurment 0.1M Kmno4 is used.determine the volume of solution required to react with 0.158M Na2s2o3 required?

    asked by Abhishek Bhargav
  73. math

    NOTE: this is for advanced functions, NOT physics A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again in a total of 4 seconds. The farthest the baseball

    asked by Elbert
  74. math

    Determine the equation of the function that has the indicated transformation applied to it. f(x)= 3(x+1)^2-2 Is it 6(x+1)^2-2? or 9(x+1)^2-2?

    asked by Thomson
  75. Chemistry

    What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?

    asked by Maddie
  76. Help Damon Ms.Sue

    1.Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. 1,256 ft2 4,189 ft2 1,089 ft2 1,568 ft2 2.Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3 4,187 ft3 1,089

    asked by Lila
  77. geometry

    From point Q on circle P, an arc is drawn that contains P. Find the measure of the arc AQB that is cut off.

    asked by lauren
  78. Chemistry

    Rank the following compounds in order of their solubility in water. (most soluble = 1 -- least soluble = 4)--Note that for the same solubility rank the same (a tie). (CH3)2CHOH HOCH2CH(OH)CH2OH CH3CH2OH (CH3)3COH

    asked by Maddie
  79. Math

    Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)

    asked by Melissa
  80. Math

    Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)

    asked by Melissa
  81. PRE-ALGEBRA

    PLEASE HELP 5x+7y=12 x=36-7y solve by the substitution methond

    asked by FAYE
  82. science

    According to Newton's second law of motion, _____? A. F = mv B. F = m/a C. a = Fnet /m D. F = ma I think it is B..?

    asked by Roger
  83. Chemistry Equilibrium

    Which of the following conditions is always true at equilibrium? deltaG=0, Q=1, K=1, deltaG=deltaG(standard), deltaG(standard)=0, Q=0, deltaG(standard)=1 I'm so confused, please help!

    asked by Student
  84. Science

    What was the main difference between Dalton's model of the atom and the model that was first developed by the Greeks?

    asked by Kim
  85. chemistry

    For the reaction 2A(g) + B(aq) + 3C(l) D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??

    asked by jane
  86. Word Problem-Calculus

    A spherical balloon is being inflated in such a way that its radius increases at a rate of 3 cm/min. If the volume of the balloon is 0 at time 0, at what rate is the volume increasing after 5 minutes? my answer is 45 cm/min. is this right. thanks

    asked by Mark
  87. Derivative-Word Problem

    Volume in liters of antifreeze remaining in a leaking radiator after t minutes is V= 20- 2t- 0.1t^2 a) how long does it take to drain the antifreeze mixture from the radiator? i got t= 10 b) how fast is volume changing when t=5? i got 9.75 is this right.

    asked by Mark
  88. Math

    An airplane is going 300 mph at a bearing of N 55 degrees E. The wind is blowing 30 mph due East. What is the actual speed and direction of the plane?

    asked by Shayne
  89. Slope- Derivative

    Find the slope of f(t)= sqrt((1-sin (2t)) a) at point (0,1) i got -1 b) at origin i got 1 is this right thanks

    asked by Mark
  90. Math/230

    A 350 word response how to compute probabilities using z score

    asked by Mike
  91. english

    calculate the mass and prepare 200ml 0.1M, 250 ml 0.2 N, 100 ml 3% of NaCl, Na2Co3 solution

    asked by Anonymous
  92. language arts

    What adjective could i use for the following sentence? What a_______ maps this atlas has!

    asked by dan
  93. Is this correct?

    What values (c) if any are predicted by the mean value theorem for the function f(x)= (x-2)^3 on the interval [0,2]? I got x= 4 and x=0, since x=0 is within the interval I chose that as my answer. Thank you.

    asked by Mark
  94. Chemistry

    A sample of an oxide of antimony (Sb) contained 51.5 g of antimony combined with 16.9 g of oxygen. What is the simplest formula for the oxide?

    asked by Greg PLS HELP
  95. Chemistry

    If an unknown metal M is .521 g how do you calculate it's atomic mass?

    asked by Christine
  96. Chemistry

    If an unknown metal M is .521 g how do you calculate it's atomic mass?

    asked by Christine
  97. chem

    A sample of an oxide of antimony (Sb) contained 51.5 g of antimony combined with 16.9 g of oxygen. What is the simplest formula for the oxide?

    asked by Greg PLS HELP
  98. Physics

    What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

    asked by Priscy
  99. Physics

    What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

    asked by Priscy
  100. Physics

    What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

    asked by Priscy
  101. Education/Technology

    A program that helps you create tests by providing you with a database of questions is A) a test generator. B) an academic tool. C) an electronic gradebook. D) an Internet service provider. I believe the answer is A, but wanted a second opinion.

    asked by Lor
  102. English

    Hello can you need the coma where I placed it? Thanks for your help. In keeping in mind the needs of the client, I will be able to meet the goals of the client.

    asked by Bernie
  103. math

    The Grade 8 students had a graduation dinner. They paid a flat rate of $125 for the use of the hall, plus $13 for each student who attended. The total cost of the dinner was $944. How many students attended the dinner ? Write an equation to solve the

    asked by Cherie
  104. Chemistry

    A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...

    asked by Maddie
  105. chemistry

    One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate According to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq)

    asked by Jane
  106. Education/Technology

    With the advent of digital technologies, A) audio and video support technologies were no longer considered valid media. B) digital audio and video technologies joined more traditional technologies as supports for instruction. C) research proved that

    asked by Lor
  107. ccc

    Find the equation of the line containing the point whose coordinates are (1, 2)and parallel to the graph of 5x + y = −4.

    asked by wiz
  108. Chemistry

    Write a balanced equation for the following: aqueous barium chloride reacts with aqueous sodium chromate to form aqueous sodium chloride plus solid barium chromate.

    asked by Chris
  109. CHEMISTRY

    40g of antimony combine with 80g of oxygen to form an oxide of antimony what is the simplest formula of the oxide

    asked by GODBLESS
  110. physics

    One airplane travels due north at 300 km/h while another travels due south at 300 km/h. Select the false statement. The airplanes have the same speed The airplanes have the same velocity

    asked by tate
  111. Math

    if a rubber band can be stretched to a circular shape that has a radius of 3.4 inches. how many 1.3-mm diameter toothpicks could of fit within it? (1 inch = 25.4 mm)

    asked by Joshua baez
  112. math

    ISABEL WANTS A COAT THAT COAST $60. SHE HAS SAVED $42 . WHAT FRACTION OF THE AMOUNT SHE NEEDS TO SAVED.

    asked by Anonymous
  113. chem

    Consider the fermentation reaction of glucose: C6H12O6 ----) 2C2H5OH+2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with excess yeast. If 35.1 g of C2H5OH was obtained, what was the percent yield of C2H5OH?

    asked by shane
  114. cHEM

    It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?

    asked by MIKE
  115. Math

    What is the perimeter of an equilateral triangle with an altitude of 15m?

    asked by Amber
  116. math

    5ã2x^3-xã18xy^2 simplify as much as possible (5+4ã2)(3+4ã10)multiple and simplify as much as possible

    asked by the last two
  117. Chemistry

    An organic compound that has the empirical formula CHO has a molecular mass of 145 amu. Its molecular formula is?

    asked by Stefhanie help me pls
  118. MATH

    ISABEL WANTS A COAT THAT COAST $60. SHE HAS SAVED $42. WHAT FRACTION OF THE AMOUNT SHE NEEDS TO SAVED?

    asked by NORMA
  119. Physics (Algerbra-based)

    A particle is moving clockwise around a circle with a radius 3.31 m. The magnitude of the total acceleration of the particle at the given instant is 14.3 m/s^2; the angle between the vector of total acceleration and the radius-vector of the particle is

    asked by Becky
  120. Chemistry

    An aqueous antifreeze solution is 31.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.039 g/cm3. Calculate the molality of the ethylene glycol.

    asked by Maddie
  121. math

    Determine the equation of the function that has the indicated transformation applied to it. f(x)= 3(x+1)^2-2 reflection across x-axis and stretched vertically by factor of 3

    asked by Thomson
  122. Life Orientation

    What is meant by discrimination?

    asked by Lerato
  123. Chem

    When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

    asked by Jake
  124. math

    NOTE: this is for advanced functions, NOT physics A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again in a total of 4 seconds. The farthest the baseball

    asked by Thomson
  125. MATH

    JAIME MAKES $150 A WEEK. HE SPENT $112. WHAT FRACTION OF HIS WEEKLY PAY HAS HE SPENT?

    asked by NORMA
  126. Math

    AM I RIGHT: SA:2*(3.14)R*R + 2*(3.14)*R*H R-4 & H-10 2*3.14*4*4= 100.48 2*3.14*4*10=251.2 SA- 25240.576 ________________________________________ V-3.14*R*R*H V-3.14*4*4*10 V-502.4 ________________________________________ V-L*W*H V-5*9*7 V- 315

    asked by Aprilly
  127. Chem

    The amount of energy needed to heat 2.00 g mercury from 50.0°C to 85.0°C is 9.87 J. The specific heat capacity of this sample of mercury is

    asked by glen
  128. chem

    A 6.75-g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 55.8 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?

    asked by dave
  129. Chemistry

    A 100.0 g sample of water at 27.0°C is poured into a 77.4 g sample of water at 89.0°C. What will be the final temperature of the water?

    asked by Joshua
  130. Chemistry

    Which of the following processes is exothermic? a.rolling a ball up a hill b.boiling water in a beaker to make steam c.allowing meat to thaw after taking it out of the freezer d.reacting hydrogen and oxygen gases to make water e.a popsicle melting on a

    asked by Trisha
  131. math

    A person purchased a $250000 home 5 years ago. he paid 20% down and signed a 30-year mortgage at 6% compounded monthly. what is the unpaid balance of the loan (now that 5 years are gone). i need answer with explanation

    asked by yassamin
  132. Math

    Three Friends went to the sub shop for lunch. They ordered the 3Ft sub made with 1/4 Ham, 1/5 roast beef, 3/8 turkey. The rest of the sub is made up of lettuce, tomato, and onions. What fraction of the sub is made up of lettuce, tomato, and onions ?

    asked by Zhanise
  133. English

    Could you please check the grammar in the following sentences? Thank you very much in advance. 1.I had just turned off the light to go to sleep and I was dozing off when I felt/experienced the greatest fear in my life 2.He had tried to get in touch with

    asked by John
  134. Math

    If the two boys ate the following amounts bryan 5/16, kevin 1/6, how much did the third person marco eat ?

    asked by Zhanise
  135. calculus

    Consider the interval I=[6,7.6]. Break I into four subintervals of length 0.4, namely the four subintervals [6,6.4],[6.4,6.8],[6.8,7.2],[7.2,7.6]. Suppose that f(6)=19, f'(6)=0, f'(6.4)=−0.5, f'(6.8)=−0.1, and f'(7.2)=−0.1. What is the approximate

    asked by lisa
  136. Chemistry

    True or false? The calorie is defined as the amount of energy (heat) required to raise the temperature of one gram of water by one degree Celsius.

    asked by LEE
  137. Geometry

    The coordinates of the vertices of a parallelogram are given. Find the possible coordinates for the fourth vertex. L(0,4), M(6,0),N(2,4)

    asked by Maya
  138. MATH

    TERRY HAS A BOARD THAT IS 4 YARDS LONG. HOW MUCH NEEDS TO BE SAWN OFF TO MAKE THE BOARD 2 FEET 8 INCHES LONG?

    asked by NORMA
  139. math

    Sally answered 90% of the math test questions and 80% of the history test questions correctly. If each test had 50 questions, how many questions in all did she answer correctly? I think that she answered 85 questions in all that were correct. Am I right?

    asked by Anonymous
  140. Geometry

    Assuming that the circumference of each circle passes through the centers of the other two, and that the radius of each circle is 1, what is the total combined area?

    asked by Paula
  141. Calculus

    Let y=tan(2x+5). Find the differential dy when x=1 and dx=.3 Find the differential dy when x=1 and dx=.6

    asked by Anonymous
  142. math help

    how to write an expression using 23 and 46

    asked by Anonymous
  143. Chemistry

    When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

    asked by pls help
  144. HELP PLEASE

    Let y=tan(2x+5). Find the differential dy when x=1 and dx=.3 Find the differential dy when x=1 and dx=.6

    asked by Anonymous
  145. AP Statistics

    12) Which of the following statements is true? a) The sampling distribution of the difference between two proportions will always be normal. b) When comparing two population proportions, either sample proportion can be used as the unbiased estimate of the

    asked by Joker
  146. MATH

    THE RATIO OF A DOGS TO CATS AT THE PET STORE IS 1:4. IF THE PET SHOP HAS 7 DOGS, HOW MANY CATS DOES IT HAVE?

    asked by NORMA
  147. Math

    The difference between the prices of two bikes is $22. The sum of the prices is $328. How much does each bike cost?

    asked by Sydney
  148. AP Statistics

    Consider the following data collected in two recent surveys of whether voters in cities A and B favor a ballot proposition in the next election. City Sample Size In Favor A 615 463 B 585 403 Suppose you're going to conduct a significance test to see if

    asked by Math Whizz
  149. Math

    If there are 51 students on a bus and 2/3 got off how many students got off the bus

    asked by Christina
  150. fractions

    Annie walked her dog 2 1/4 miles from her house to the dog park and 3/7/8 miles around the park.Then she walked the same distance home.How many miles did she walk in all?

    asked by ttuuffyy
  151. physics

    A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?

    asked by thuy
  152. math

    Marco's goal is to eat only 2,000 calories each day. One day for breakfast he consumed 310 calories, for lunch he consumed 200 more calories than breakfast, and for dinner he consumed 800. Did he make his goal? I added 310+510=810+800 and got 1,610 not

    asked by jared
  153. physics

    A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?

    asked by thuy
  154. LAST THING!

    2sec^2(2x+5) dx what's the answer when dx is .3 it keeps saying i'm wrong with the one i've found

    asked by Anonymous
  155. macroeconomics

    assume that American rice sells for 100.00 per bushel, japanese rice sells for 16,000 yen per bushel, and the exchange rate is 80 yen per 1 dollar. what would be your profit per bushel of rice, and how you can make a profit in this situation

    asked by connie
  156. Spanish

    Can someone help me peer edit my work the second paragraph is my conclusion, this is about diet: Dieta Su dieta es muy importante para mantener el bueno salud. Comiendo comidas saludables ayudas su mantener fuerte un cuerpo y perder peso o subir peso, pero

    asked by Carol
  157. math

    Jan is making a pencil holder out of plastic canvas.The pencil holder will be 4 inches high. It will not have a top.The perimeter of the square base is 17.64 inches.How much plastic canvas does Jan need?

    asked by peter
  158. math

    A balance scale is perfectly balanced with two blocks on one side and ten weights on the other. If each weight equals 2.0 grams, how much does one block weigh? Please answer and explain.

    asked by Anonymous
  159. nonfiction

    When does the Narrative of Sojourner Truth take place?

    asked by Anonymous
  160. Algebra

    Minimum Wage. In 1995, the minimum wage was $4.25 per hour, and by 2010 it had increased to $7.25 per hour. a) Find the slope of the line passing through the points (1995, 4.25) and (2010, 7.25) b) Interpret the slope as a rate of change. c) If this trend

    asked by tee
  161. Calculus

    Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

    asked by nikki
  162. math

    A balance scale is perfectly balanced with two blocks on one side and ten weights on the other. If each weight equals 2.0 grams, how much does one block weigh?

    asked by Anonymous
  163. Physics 1

    An astronaut in her space suit has a total mass of m1 = 76.9 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank

    asked by Emily
  164. human life

    The human population of the world is over 6 billion. The increase of the human population P (in billions) can be approximated using the following formula: P = 0.073t + 6.08, where t is the number of years after the year 2000. Use the formula to predict how

    asked by Anonymous
  165. Math

    Find the number of each kind of object in the collection. Sue's Card Collection 8 packs of baseball cards 3 fewer packs of hockey cards than football cards 17 packs in all

    asked by Jackie
  166. CHEMISTRY: URGENT DRBob222

    A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were required. 1. Write an equation for the

    asked by LC-Laila
  167. math

    Marvin has a 27-foot ladder. Safety standards dictate that the base of a 27-foot ladder should be placed 7 feet from a vertical wall. How far above the ground will the top of the ladder be on the wall, in feet? Round your answer to the nearest hundredth.

    asked by jos
  168. Geography

    What are three colonies between 70 and 75 degrees west longitude???????

    asked by Khaii jack
  169. Math

    what if you divide circumference by diameter and don't get pi ? What does that mean about the circle (because today i got numbers that were exactly over pi and some were even under)?

    asked by Alexis Thompson
  170. broadcasting/english

    Hi I would like proofreading/feedback on my broadcasting story. BTW It's in all caps because that's how our teacher told us to write it. A MICHIGAN ATTORNEY HAS FILED CHARGES AGAINST THE WIFE OF FORMER BAY CITY BUSINESSMAN… M. VICKTORIA WILSON—THE WIFE

    asked by Blaze
  171. math

    Jan is making a pencil holder out of plastic canvas.The pencil holder will be 4 inches high. It will not have a top.The perimeter of the square base is 17.64 inches.How much plastic canvas does Jan need?

    asked by peter
  172. Happy π Day to all mathematicians

    Today, March 14, at 1:59 was a very special time.

    asked by Reiny
  173. math

    Earth's mass, in kilograms, is 5.97x10^24. the moon's mass is 7.34x10^22. How many times greater is Earth's mass (in scientific notation)?

    asked by Michelle
  174. calculus

    Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

    asked by nikki
  175. ALGEBRA

    SOLVE FOR THE VARIABLE X+3=7

    asked by NORMA
  176. algebra

    solve for variable 4x=20

    asked by NORMA
  177. Science help.

    1. The ___ is the outer, thinnest layer of your skin, which houses sweat pores. (1 point) epidermis dermis fatty layer hair 2. One of the purposes of sweat glands is to release waste products, such as water and _____. (1 point) blood dirt sugar salt 3.

    asked by Someone
  178. Math

    If someone is attached to a 20 ft rope, which is attached to the corner of a building, how far can they move? If the bulding is 22 ft X 15 ft?

    asked by Joe
  179. chemistry

    A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?

    asked by Jo
  180. Math

    How to divide 150 by 3.6 please tell me with steps I tried it several times but can't seem to figure it out!!!

    asked by Hibiscus
  181. biology

    In this problem, 6 amino acids have been randomly selected from the 129 amino acids in lysozyme; they are shown as solid spheres. The remainder of the protein is shown as a cloud of tiny dots. Your task is to find out which of the 6 amino acids are on the

    asked by selly
  182. Clueless in calculus

    Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

    asked by Dani
  183. more Broadcasting/english

    May I get some feedback on this one as well please? GENERAL MOTORS MAY INVEST 38 MILLION DOLLARS TO EXPAND ITS LANSING GRAND RIVER ASSEMBLY PLANT… THIS MOVE COULD BRING 150 JOBS. THE PRESIDENT AND CEO OF LANSING ECONOMIC AREA PARTNERSHIP (LEAP)

    asked by Blaze
  184. Chemistry

    If the molality of a CaCl2 solution is .100 mol/kg, and was made from 500.0 mL of water, how many grams of CaCl2 were needed to make the solution? Step by step would be appreciated!

    asked by Tim
  185. physics

    When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1280 kg automobile traveling at 30.8 m/s comes to a halt after its brakes are applied,

    asked by Jayde Larson
  186. physics

    A rocket moves upward, starting from rest with an acceleration of 30.5 m/s2 for 3.39 s. It runs out of fuel at the end of the 3.39 s but does not stop. How high does it rise above the ground?

    asked by John Miller
  187. CHEM

    A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound? i got C3H3O2 IS IT RIGHT?

    asked by shane
  188. english

    Circle the word with two vowels together where each vowel has a separate vowel sound. Then underline the letters that stand for the two different vowel sounds. 1 clean, paint, patio

    asked by jasmine
  189. math

    Joe says that knowing 2x3 helps him know 4x6 is he right explain

    asked by philip
  190. Chemistry

    What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?

    asked by Brian
  191. english

    What is is in shirly english

    asked by sarah sosnin
  192. Chemistry

    What is the C-C-H bond angle in the molecule H2CCO?

    asked by Brian
  193. Chemistry

    How many valance electrons are there in [(C2H5)4N]+ ?

    asked by Brian
  194. Chemistry

    What is the wavelength of an electron traveling at 7.59% of the speed of light?

    asked by Brian
  195. Chemistry

    A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the compound?

    asked by Brian
  196. Let f be the function be defined by f(x)=5^((2x^2)

    Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) find the range of f without using a calculator

    asked by Aparna
  197. artist

    Is it possible for a band or artist to make topical or political commentary in a song today while focusing on turning a profit?

    asked by ashley
  198. History

    Hi can you help me find a website for teens in the 1920's and a journal on it.

    asked by Marco
  199. english

    circle the words with two vowels together where each vowel has a separate vowel sound, then under line the letters that stand for the two different vowel sounds. 2. audio, faith, search. 3. greed, journal, rodeo 4. either, medium, southern. 5 beach, pound,

    asked by jasmine
  200. math

    Solve for x in the equation (x − 7)^2 − 4 = (x + 1)^2.

    asked by mathlab
  201. Math

    Bus A leaves interchange 6 minutes, Bus B leaves 12 minutes later, Bus C leaves 18 minutes later. If all buses leave at 6 am when will all 3 buses leave at the same time again. Kindly show workings and explantion to problem. Thank you

    asked by Maggie
  202. Physics

    What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

    asked by PC
  203. Physics

    What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

    asked by PC
  204. Education

    1. in a study examining preschoolers' responses to their peers distress, researchers used ___ to record each instance in which a child cried, followed by other children's reactions. a. time sampling b. systematic collection c. event sampling d. structured

    asked by Joe
  205. Math

    What is an easy drawing that has a lot of circles in it.

    asked by Julie
  206. algebra

    solve for variable x/8=42

    asked by NORMA
  207. physics

    A 1.85 m tall basketball player attempts a goal 9.3 m from a basket (3.05 m high). If he shoots the ball at a 45° angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?

    asked by John Miller
  208. Math

    Which is greater 0.9 x 2 or 2 + 9? My answer is 0.9 + 2 is greater because it equals 2.9 and 0.9 x 2 = 1.8.. Is this correct?

    asked by Mike
  209. chemistry

    When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of 1.0 M NaOH at 25.0 °C in a calorimeter, the temperature of the aqueous solution increases to 33.9 °C. Assuming the specific heat of the solution is 4.18 J/(g·°C), that its density is 1.00 g/mL, and

    asked by nobody
  210. Social studies

    About 40,000 kinds of flowering plants grow in

    asked by Shaneikque
  211. Math Probability

    Using a standard deck of 52 cards find each probability. 1.)King, queen, or black card 2.)Spade or hearts card

    asked by B1nary
  212. statistics

    A diabetes nurse educator believes that her patients have particularly bad control of their blood sugar. To test this she selected the fasting blood sugar values for 15 of the patients she saw this week. The national mean for patients with this level of

    asked by Kim
  213. physics

    If You do 100 j of work to elevate a bucket of water,what is its gravitational potential energy relative to its starting position?

    asked by Tyler
  214. Math

    If there are 51 students on a bus and 2/3 got off how many students got off the bus

    asked by Christina
  215. algebra

    A boat can travel 16 km/h against the current.The same boat can travel 30 km/h with the current.find the rate of the boat in still water and the rate of the current. Could someone help me.it seams like an easy problem, but I am not getting there.Thank YU

    asked by Josie
  216. fractions

    Terry weighed his two cats at the veterinarian's office.Boots weighed 12 9/10 pounds. and Tiger weighed 13 1/4 pounds.What is the total weight of both cats?How can I explain this

    asked by ttuuffyy
  217. writing prompt at least five sentences

    describe why it is important to protect our forest .write at least 5 sentences convincing me why we should protect them.

    asked by e a
  218. math

    In 2009, there were 12 million fewer acres of farm land in Arizona than there were in 1980. If the sum of acreage for these two years is 64 million acres, find the number of farm land acres in Arizona for each of these years.

    asked by tee
  219. writing

    I need help how to describe why it is important to protect our forest. write five convincing sentences why we should protect them..

    asked by e a
  220. Math

    Order from least to greatest 4/10,0.3,1/2

    asked by Terrell
  221. CHEMISTRY: URGENT DRBob222

    Why was the reaction mixture titrated quickly? (question fom: A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and

    asked by LC-Laila
  222. algebra 2

    3n/(n2 -7n + 10) - 2n/(n2-8n+15)

    asked by Mikayla
  223. calculus

    R(t) = −131t − 749.5 million dollars per year and the rate of change in the annual operating profit may be modeled by P(t) = 12t + 76 million dollars per year, where t is the number of years since the end of 1999. Determine the accumulated change in

    asked by bobbi33
  224. physics

    A light spring with a spring constant of 105.0 N/m rests vertically on the table, as shown in (a) below. A 2.05 g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 4.64 m3 and connected to the spring, causing the spring to stretch, as

    asked by John Miller
  225. science

    wordy numbers: 622-4463 (let it do the work)

    asked by brooke
  226. english

    I wrote, Ms.Marcus is tall and a little bit skinny. What are the two sound effects in the line above? Which words are involved in each sound effect. Please help I'm not good with English class thanks :)

    asked by steph
  227. Math

    Where do the perentheses go to solve this problem : 7 - 6 x 7 DEVIDE 5 + 7 = -43 2/3

    asked by Laura
  228. Chem

    40. If 12.0 gram of O2 is required to inflate a balloon to a certain size at 27 degrees C, what mass of O2 is required to inflate it to the same size and pressure at 81 deg C?

    asked by Vince
  229. social studies

    information on the preamble,declaration of natural rights, list of grievance, declaration of independence by U.S.

    asked by Anonymous
  230. Algebra

    Help Please!! Write the orderd pair describing the coordinates of each intercept : x-intercept: 17 : y-intercept: 3/4

    asked by Nicole
  231. social studies

    the preamble: six goals for the U.S. Government. information on six goals for this

    asked by Anonymous
  232. Algebra

    The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.

    asked by Jon
  233. Algebra

    Solve |6 - 4x| < -13

    asked by Jon
  234. Algebra

    Solve 1/5x - 3 = 1/2x - 1/5x

    asked by Jon
  235. math

    A student was asked to find the inverse of the function f(x)=3x-7. The student began the solution with the following: Write f(x) = 3x-7 as y = 3x-7 x= 3y-7 The student eventually got the right answer for f^(-1)(x) [inverse notation] but did not get full

    asked by Hasane
  236. Algebra

    Solve 0.17y + 0.03(y + 9000) = 870

    asked by Jon
  237. Algebra

    Solve |4y – 3| > 8

    asked by Jon
  238. physics

    what factors can affect a bodies temperature rise?

    asked by sophie
  239. health Ms. Sue please

    1. The body's functions are slowed when alcohol reaches where? (1 point) The stomach The heart The liver The brain 2. Which statement is NOT true? (1 point) Regular use of alcohol can lead to addiction. Alcoholism can be cured. Someone cannot cause someone

    asked by Delilah
  240. physics

    differences btw a window unit air-conditioner and split-unit air conditioner.(2)explain d working principle of a freeze dryer using a diagram

    asked by sophie
  241. Math

    3n/(n2 -7n + 10) - 2n/(n2-8n+15) thanks

    asked by Nathan
  242. Math

    maria has a slice of pizza that is 1/6 of the pizza. Ben has a slice of pizza that is 1/3 of the pizza. Maria's slice is bigger. Draw pizzas to show how this is possible.

    asked by Anonymous
  243. physics

    Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1720 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 81.0 kg,

    asked by Nicole
  244. Chemistry

    If 11.6 mL of 0.17 M MgCl2 are mixed with 24.9 mL of 0.58 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 10-11 for Mg(OH)2

    asked by Gregory
  245. Chemistry

    A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.8 10-11 for Mg(OH)2 and Ksp = 5.1 10-26 for Sn(OH)2. (a) What [Sn2+] is required to start the precipitation of Sn(OH)2? (b) What [Sn2+]

    asked by Gregory
  246. Question!!!!

    Do advertisers tell the society what they want to hear just so they can make money?

    asked by Anonymous
  247. Statistics

    A coin is tossed 10 times. What is the probability that the third head will apear on the tenth toss?

    asked by Nick
  248. English

    The most important task related to reading is: A. reading speed. B. reading comprehension. C. taking notes. D. memorization. is it B

    asked by Amy
  249. mathematics

    the 1st term of arithmetic series is 2 .the 1st ,3rd and 11th terms are the first the terms of a geometric series. find the 6 terms of the arithemetic series

    asked by cebile
  250. English

    Speed reading is concerned with: A. how fast you read. B. the number of words read in a minute. C. reading rate as well as comprehension of what was read. D. recalling three main points in three minutes. is it C

    asked by Amy
  251. math asap

    I don't understand can you please help bedtime 1. (-5)-(-6)+(-1) 2. (-3.1)-(-7.5)+(+1.8) 3. (-9)+(-2)-(-6)+(-5) 4. (+5.2)+(-2.6)-(-3.7) 5. (-8)-(+7)-(+10) 6. (+4.5)-(-3.25)-(+1.5) Please answer all 6 if possible thanks!

    asked by noahc
  252. English

    Which is the better strategy in note-taking? A. Take as many notes as possible. B. Study your notes closer to exam time. C. Take notes according to chapter objectives. D. Notes should only include key words. is it A

    asked by Amy
  253. College algebra

    Answer the questions about the following functions. f(x) = 14^2/x^4 + 49 (a) Is the point (-sqrt 7,1) on the graph of f? (b) If x=1, what is f(x)? What point is on the graph of f? (c) If f(x)=1, what is x? what point(s) are on graph of f? (d)What is the

    asked by Jenn
  254. Chemistry

    What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 The ksp expression is 1.50×10^-14=(Ag^+2)^2(SO3^-2)/(Ag2SO3). Is the concentration 3.0×10^-9?

    asked by Anon
  255. sociology

    There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?

    asked by Jo
  256. ecology

    During the demographic transition of the eighteenth century, humankind led advances in mortlity and economy, leading to a prosperous population growth. What types of resources are necessary for population change and how might the availability of resources

    asked by Jo
  257. sociology

    How have families changed over time and what relationship does this have to population structure? Provide an example on one social institution that has been affected by these shifts in family composition?

    asked by Mel
  258. broadcasting/english

    feedback is appreciated, thanks in advance THOUSANDS OF JOBLESS MICHIGANDERS WILL RECEIVE LESS MONEY IN THEIR WEEKLY EMERGENCY UNEMPLOYMENT CHECKS. MORE THAN 74 THOUSAND PEOPLE IN MICHIGAN RECEIVE BENEFITS THROUGH FEDERALLY FUNDED EMERGENCY UNEMPLOYMENT

    asked by Blaze
  259. Chemistry

    A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

    asked by Anon
  260. Language Arts

    I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give

    asked by Sam
  261. Chemistry

    Which of the following will be more soluble in an acidic solution than in pure water? Be(OH)2 Ag2SO4 RbClO4 CuCN Cul

    asked by Anon
  262. English

    Africa was one of the sites where agriculture began. Archaeological investigations suggest that knowledge of cultivation moved west from the ancient Judaea (southern Palestine) and arrived in the Nile Delta in Egypt about the fifth millennium before

    asked by Amy
  263. Help! stuck on this math question

    3n/(n^2 -7n + 10) - 2n/(n^2-8n+15)

    asked by Mikayla
  264. Chemistry

    If 18.7 mL of 0.14 M MgCl2 are mixed with 24.2 mL of 0.52 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 10-11 for Mg(OH)2.

    asked by Arturo
  265. Math

    Aubrey spent 2/7 of her money and gave 1/4 of the remaining money to her hungry parents. she had $120 left. How much did she have left?

    asked by Scott
  266. Math

    The median score on attest is 90. Is it possible to add two or more scores to the data and still have a median score of 90? Explain

    asked by Brandon
  267. Maths

    data with mean of 32, standard deviation of 1.2, What is the 99th percentile score?

    asked by Enoch
  268. Math

    27a4b7 (A-1)3 ----------- • ------------ = ? 3a2-6a-3 9ab

    asked by Chely
  269. physics

    Calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5100 km above the earth's surface.

    asked by Nicole
  270. Chemistry

    Solid Na2SO4 is added to a solution which is 0.020 M in Pb(NO3)2 and 0.045 M in AgNO3. Assume the volume remains constant. Ksp = 2.0 10-8 for PbSO4 and Ksp = 1.2 10-5 for Ag2SO4. What is the concentration of the first ion precipitated when the second ion

    asked by John