nina

Most popular questions and responses by nina
  1. chemistry

    a) Calculate the percent ionization of 0.125M lactic acid (Ka=1.4x10^-4) b) Calculate the percent ionization of 0.125M lactic acid in a solution containing 0.00075 M sodium lactate.

    asked on July 31, 2014
  2. Earth Science

    The Rocky Mountains are more jagged than the Appalachian Mountains. This suggests that • erosion has worn down the Appalachian Mountains more than the Rocky Mountains. • the Rocky Mountains are older. • the Appalachian Mountains are more likely to

    asked on January 9, 2014
  3. Trigonometry

    A clown is juggling at a circus. The path of a ball is given by the parametric equations x=2 cos T + 2 and y = 3 sin T + 3. In what direction is the ball moving? Up and to the right counterclockwise down and to the right clockwise After graphing it and

    asked on May 29, 2017
  4. chemistry

    how can i Specify what ions are present in solution upon dissolving each of the following substances in water: ZnCl2, HNO3, (NH4)2SO4,Ca(OH)2

    asked on October 4, 2009
  5. Math

    A 500-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0◦ with the horizontal. What is the tension in the rope?

    asked on October 19, 2017
  6. Algebra 2

    I'm working on Lesson 6: Absolute Value Equations and Inequalities Algebra 2 A Unit 2: Expressions, Equations, and Inequalities and feel confident in my first few answers, but beyond that am lost. May I have some help? **=the answer I believe to be true

    asked on September 23, 2017
  7. statistics

    The average height of 18-year-old American women is 64.2 inches. You wonder whether the mean height of this year’s female graduates from your local high school is different from the national average. You measure an SRS of 78 female graduates and find

    asked on April 11, 2013
  8. Chemistry

    A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5 g and contains about 5% impurity. Based on his knowledge of solubility the student decides to use benzene as the solvent. After crystallization, the crystals are

    asked on October 8, 2008
  9. Medical terminology

    Omar Hussain had to have part of his lung removed. This surgery is known as a _______

    asked on January 11, 2016
  10. MATH

    I NEED HELP WITH MY LEAP MATH MIDTEST QUESTIONS STAT!

    asked on January 12, 2017
  11. physics

    a child is sliding on a sled at 1.5m/s to the right. You stop the sled by pushing on it for 0.50 s in a direction opposite to its motion. If the mass of the child and the sled is 35kg. what average force do need to apply to stop the sled. Use the concepts

    asked on November 18, 2010
  12. Chemistry

    A student completes titration by adding 12.0 mL of NaOH(aq) of an unknown concentration to 16.0 mL of 0.15M HCl(aq). what is the molar concentration of the NaOH(aq)?

    asked on June 7, 2012
  13. Chemistry

    A chemist wants to prepare phosgene, COCl2, by the following reaction: CO(g) + Cl2(g) COCl2(g) He places 2.60 g of chlorine, Cl2, and an equal molar amount of carbon monoxide, CO, into a 10.00 L reaction vessel at 395 °C. After the reaction comes to

    asked on August 3, 2014
  14. Med

    Daniel was rushed from the accident scene to the hospital, and in the ambulance his basic respiratory function was monitored using a ______

    asked on January 11, 2016
  15. algebra 1

    Solve the system by either substitution or elimination 3x-5y=21 2x+y=1 A (2,-3) B (2,3) C (-2,-1) D (-2,1)

    asked on January 11, 2016
  16. Please Help! Quadratic Eqautions

    The population of a town P(t)is modelled by the function P(t)=6t+110t+3000, where t is time in years. Note t=0 represents the years 2000.

    asked on November 17, 2012
  17. math/help please

    Question: Kenny reads 5/8 page in 2/3 minutes. This is unit rates. Please help!

    asked on September 28, 2014
  18. Medical

    Ms. Eubanks missed the recital because of a sore throat. This condition is known as _______

    asked on January 11, 2016
  19. health

    branches of health education

    asked on November 22, 2008
  20. Math Help! Someone please help?:)

    1. The sides of a square are increased by a scale of 6. The perimeter of the small square is 10ft. What is the perimeter of the larger sqaure? 2.5 ft, 10 ft, 60 ft, 120 ft 2. A map of Utah has a scale of 1 cm:30 mi. The boarder of Utah and Wyoming measures

    asked on November 5, 2013
  21. Calculus

    If x + 7y = 29 is an equation of the line normal to the graph of f at the point (1,4), then f'(1) = PLEASEEE HELP!

    asked on December 2, 2008
  22. Math

    An airplane needs to head due north, but there is a wind blowing from the southwest at 85 km/hr. The plane flies with an airspeed of 550 km/hr. To end up flying due north, how many degrees west of north will the pilot need to fly the plane? Round to the

    asked on April 17, 2019
  23. Technology

    1. Using a graphic organizer in the prewriting process can do all of the following except: A. organize the writers thoughts B. help narrow the writers topic C. research a writers story** D. help make the writing more detailed 2. Writing a story with proper

    asked on October 6, 2015
  24. social studies

    Which of these is an example of price competition? A a new advertising campaign B a loyalty rewards program C a special holiday sale (?) D a customer satisfaction survey

    asked on August 19, 2015
  25. Trigonometry

    over which of the following domains is f(x) = csc(0.1x + 1.2) defined at all points and invertible? x = [0,10] x = [10,20] x = [20,30] x = [30,40] Can someone please explain how to solve this to me and show me all the steps rather than simply giving me the

    asked on April 19, 2017
  26. Math

    Two combines are able to harvest 320 acres of crops in a certain amount of time. How many acres will (a)3, (b)4, (c)6 and (d)7 combines harvest if they work at the same rate for this amount of time?

    asked on December 24, 2016
  27. Math

    You rent x pairs of shoes for $2 each. You buy the same number of drinks for $1.50 each. You also pay $9 for a bowling lane. Write an expression in simplest form.

    asked on March 28, 2017
  28. physics(universal law of gravitation)

    a satellite has a mass of 100 kg and is located at 2 x 10^6 m above the surface if the Earth. wHAT is the potential energy associated with the satellite at this location? What is the magnitude of the gravitational force on the satellite?

    asked on January 14, 2010
  29. English

    Dona Stein's "Putting Mother By" the poem is on Ploughshares, but i can't post the link. I have to write an essay/commentary/analysis on the poem, and i was wondering if someone could check up on my first paragraph. I know it's all one big metaphor, about

    asked on June 10, 2009
  30. Math

    If x is the average (arithmetic mean) of m and 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m? A) m+6 B) m+7***** C) 2m+14 D) 3m+21

    asked on March 12, 2018
  31. Physics

    Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1200N. F=

    asked on February 22, 2018
  32. Physics

    (a) A small mail bag is released from a helicopter that is descending steadily at 2.13 m/s. After 4.38 s, what is the speed of the mail- bag? The acceleration of gravity is 9.8 m/s2 . (b) After the mailbag is dropped, the helicopter continues descending

    asked on October 26, 2014
  33. English

    I have two questions about this poem that I don't understand. Base Details If I were fierce, and bald, and short of breath, I'd live with scarlet Majors at the Base, And speed glum heroes up the line to death. You'd see me with my puffy petulant face,

    asked on November 13, 2014
  34. math

    a ball is thrown upward at 64 feet per second from the top of an 80 feet high building. The height of the ball can be modeled by S(t) = -16t^2 + 64t + 80(feet), where t is the number of seconds after the ball is thrown. describe the graph model

    asked on October 7, 2012
  35. Book: Fahrenheit 451 Ray Brad Bury

    . What does Granger mean when he says “I am Plato’s Republic” or that Montag is “the book of Ecclesiastes”?

    asked on February 24, 2013
  36. Chemistry

    Each of the solvents given should effectively separate of the following mixtures by TLC. Match the appropriate solvent with the mixture that you would expect to separate well with the solvent. Select your solvent from the following: hexane, methylene

    asked on October 9, 2008
  37. History

    Discuss the differences and similarities in post-independence policies in India and Egypt. Please help me with this question If you could give me a little summary of each country it would be amazing. Its the only q I have left on this assignment.

    asked on July 23, 2012
  38. Math

    A number has more tens than hundreds or ones. What might the number be?

    asked on March 7, 2016
  39. physical

    branches of physical education

    asked on November 22, 2008
  40. physics

    A 70 kg man jumps 1.00m down onto a concrete walkway. His downward motion stops in .02 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?

    asked on November 21, 2010
  41. math

    I recently learned that in order to graph any trig function you need to factor the period out of the phase shift. Can someone explain why? I think this has something to do with the multiple x intercepts but I am not sure.

    asked on December 31, 2018
  42. History

    how did the treaty of Guadalupe of Hidalgo affect Mexican Americans?

    asked on December 9, 2018
  43. social studies

    For what main reason do consumers buy goods and services? A to make money to save for later B to show show support for free trade C to help grow the economy D to satisfy their wants and needs(?)

    asked on August 19, 2015
  44. English

    I need some help with looking over my answers... thanks for the help... Base Details If I were fierce, and bald, and short of breath, I'd live with scarlet Majors at the Base, And speed glum heroes up the line to death. You'd see me with my puffy petulant

    asked on November 13, 2014
  45. Math

    The riddle family has a total monthly budget of $3400 if the utilities represents 15% of the budget and how much money is the riddle family spend on utilities each year

    asked on April 22, 2019
  46. social studies

    Which type of economic institution works to provide services to a community and does not pay taxes? A bank B market C non-profit D labor union (?)

    asked on August 19, 2015
  47. Algebra

    A ball is thrown into the air with an initial upward velocity of 60 ft/s. Its height (h) in feet after t seconds is given by the function h = –16t² + 60t + 6. What will the height be at t = 3 seconds? A) 3 B) 4***** C) 5 D) 6

    asked on April 11, 2017
  48. Chemistry

    Calculate the amount of energy released per gram of nuclei when 2 protium nuclei react to form deuterium nucleus (protium = 1.00782 amu, deuterium = 2.01410 amu). The answer in the book is -2.0 x 10^10 J, but I don't have any idea on how to do this. Please

    asked on March 15, 2014
  49. social studies

    A company in China manufactures basketballs. A company in the United States buys the basketballs and resells them to people there. What term best describes the U.S. company? A importer B exporter C producer D consumer (?)

    asked on August 19, 2015
  50. Geometry Help!!!!!!!!!!

    In triangle ABC if m

    asked on June 23, 2011
  51. math/help please

    Question: a garden snail moves 1/6 foot in 1/3 hour. This is unit rates. Please help, I don't get this lesson!

    asked on September 28, 2014
  52. English checking

    Hi, is there anyone who can help me with this essay's English checking? Thank you very much! ################################## TITLE:Based on your analysis for the group presentation, what are the most important implications that you would draw from this

    asked on April 20, 2008
  53. algrebra

    When adding the square root of 16 and -8 which type of number is the Sum Integer Irrational number Radical Whole number

    asked on November 5, 2017
  54. Math

    When adding the square root of 16 and -8 which type of number is the Sum Integer Irrational number Radical Whole number

    asked on November 5, 2017
  55. Chemistry

    given the equation Mg +2HCL --> MgCL2+H2, how many moles of hydrochloric acid are needed to react with O.50 mol of magnesium ? (1)0.5 (2)1.0 (3)2.0 (4)4.0 is it 3 ?

    asked on January 2, 2011
  56. Math

    So my question is find the circumference of the circle in terms of Pi then use the approximation 3.14 for pi and approximate the circumference. How would I do this? The radius of the circle is 2m.

    asked on November 2, 2017
  57. Geomatic Sequence

    In a geomatic sequence, the seventh term exceeds the fifth term by 1920. Find the sum of the first eleven terms if the common ratio of the sequence is 2.

    asked on October 1, 2012
  58. Physics

    In a typical living cell, the electric potential inside the cell is 0.070 V lower than the electric potential outside the cell. The thickness of the cell membrane is 0.10µm. What is the magnitude and direction of the electric field (E) within the cell

    asked on March 30, 2013
  59. geometry

    Identify the lateral area and surface area of a regular square pyramid with base edge length 11 cm and slant height 15 cm.

    asked on June 25, 2016
  60. math

    What integer would represent "twenty-two hundred feet above sea level"?

    asked on December 12, 2013
  61. reading

    What is the prefix root and suffix for daintly? Am i correct? Prefix- none Suffix-ily Root- daint

    asked on September 22, 2015
  62. Physics

    The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.50 kcal of heat enters 1.25 kg of the following, originally at 22.5°C.

    asked on November 26, 2014
  63. Arithmetic Sequence

    Given the third term of an arithmetic sequence less than the fourth term by three. The seventh term is two times the fifth term. Find the common difference and the first term.

    asked on September 30, 2012
  64. Biology

    11) A home health nurse is assisting with the plan of care for an older adult client who had cataract surgery recently. Which of the following information should the nurse include in the plan of care? A. Remain on bed rest for at least 2 days B. Rest in

    asked on April 11, 2019
  65. AP World History Please help

    What social structure did Confucianism imply? What were the key social classes, and how did they differ? Why did Confucianism have such a deep impact on Chinese and East Asian history? What groups and institutions could benefit from it? What does the

    asked on June 24, 2011
  66. Chemistry

    Triethylamine, (CH3CH2)3N, is very slightly soluble in water but readily soluble (with stirring) in 1.5 M HCL.

    asked on February 4, 2009
  67. Chemistry

    A student who was isolating aspirin stopped the experiment after filtration step alumina. One week later, the methanol was evaporated and the experiment was completed. The melting point of the aspirin was found to be 110-115 degrees C. Explain why the

    asked on October 10, 2008
  68. physics

    What is the (absolute) pressure of a bulb? (to 3 s.f and in kPa) (Patm = 101 kPa, ρwater = 1000 kg m−3) Height = 16.0cm what equation am i meant to use here? is it P = pgh + Patm ? or something else. help would be much appreciated.

    asked on May 2, 2019
  69. Biology

    1) A nurse is collecting data from a client who has open-angle glaucoma which of the following findings should the nurse expect? A. Loss of peripheral vision****** B. Headache C. Halos around lights D. Discomfort in the eyes 2) A nurse is collecting data

    asked on April 11, 2019
  70. Biology

    16) A nurse is collecting data from a client who has parkinson's disease and his experiencing bradykinesia. Which of the following finding should the nurse expect? A. Increased blinking B. States euphoria C. Slurred speech D. Decreased respiratory rate 17)

    asked on April 11, 2019
  71. Please Help! Quadratic Eqautions

    The population of a town P(t)is modelled by the function P(t)=6t^2+110t+3000, where t is time in years. Note t=0 represents the years 2000. When will the population reach 6000?

    asked on November 17, 2012
  72. Physics

    The boy on the tower of height h = 10 m throws a ball a distance of x = 68 m, as shown. At what speed, in m/s, is the ball thrown?

    asked on October 24, 2010
  73. math

    Determine the rate per cent per annum if Rs 6,250 amounts to Rs 6760 in six months ,interest being compounded quarterly

    asked on July 28, 2016
  74. Math- HELP

    1. Write the fraction or mixed number as a decimal 7/8 A. 0.78** B. 0.875 C. 0.8777 D. 1.875 2. 1 1/2 A. 0.50 B. 1.5** C. 1.05 D. 1.1 3. 4 3/8 A. 0.375 B. 4.35 C. 4.375 D. 4.5** 4. Write the decimal as a fraction or mixed number 0.4 A. 4/100** B. 2/5 C.

    asked on October 9, 2015
  75. Physics

    How many electrons must be removed from an object to leave it with a charge of 2.0 x 10 exp-10C? This is a small though not neglible static charge.

    asked on May 10, 2010
  76. Mathematicas

    Sam and Susie are twins. Sam has as many brothers as he has sisters. Suzie has at least 1 sister, and twice as many brothers as sisters. How many kids are in the family altogether?

    asked on April 18, 2010
  77. math

    A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 63

    asked on April 27, 2018
  78. Algebra

    the perimeter of a triangle is 56 inches. the longest side measures 4 inches less than the sum of the other two sides. three times the shortest side is 4 inches more than the longest side. find the lengths of the three sides

    asked on April 21, 2016
  79. Math

    A plane flies due east for 120 km from airport a to airport b it then flies due north for 280 km to airport c finally it flies directly back to airport a calculate the direct distance from airport to airport a give your answer to the nearest kilometre

    asked on January 1, 2014
  80. Geometry please help me need to finish!

    The slant height of a regular pentagonal pyramid is 6 cm, and the length of each side of the base is 3 cm. Find the lateral area.

    asked on August 18, 2011
  81. Math

    Julio ordered towo pizzas for dinner Friday. Dad ate 3/4 of one pizza, Jenny ate 1/8 of a pizza, Danny ate 1/4 of a pizza, and Mom ate 1/2 of a pizza. What fraction of a pizza was left for a midnight snack?

    asked on March 9, 2010
  82. math

    a farmer has cows and chickens. he has a total of 20 heads and 64 legs. How much of each animal does he have?

    asked on October 25, 2012
  83. Physics

    How many excess electrons does an object with a total charge of -1.0 x 10exp-9C have on it? This is approximately the amount of charge involved in commonly encountered static electricity.

    asked on May 10, 2010
  84. Biology

    6) A nurse is evaluating discharge instructions for a client following a right cataract extraction. Which of the following client statements indicates the teaching is effective? A. I will take a stool softener until my eye is healed. B. I will expect to

    asked on April 11, 2019
  85. chemistry

    If 6.20 mol of calcium carbide (CaC2) reacts with an excess of water, how many moles of acetylene (C2H2), a gas used in welding, will be produced? CaC2(s) + 2 H2O(l) Ca(OH)2(aq) + C2H2(g)

    asked on February 11, 2015
  86. Physics

    A 3.00 gram lead bullet travels at a speed of 240 m/s and hits a wooden post. If half the heat energy generated remain with the bullet, what is the increase in temperature of the embedded bullet? (clead = 128 J/kg C)

    asked on February 5, 2014
  87. trig

    Two Airplanes leave an airport at the same time on different runways. One flies on a bearing of N66degreesW at 325 miles per hour. The other airplane flies on a bearing öf S26degreesW at 300 miles per hour. How far apart will the airplanes be after 2

    asked on January 6, 2014
  88. statistics

    Individual M&M plain candies have weights that are normally distributed with a mean weight of 0.8565 g and a standard deviation of 0.0518 g. If you randomly select 465 M&M plain candies, what is the probability that their mean weight will be less than

    asked on April 24, 2016
  89. math

    A square garden outside of Tom's apartment has an area of 64 square meters. The area can be represented by the equation x2 = 64 where x is the length of a side of the garden. Enter the length of the garden (in meters).

    asked on March 11, 2019
  90. Math

    Not Urgent But Please Check My Answer: A pencil at a stationery store costs $1, and a pen costs $1.50. Stella spent $21 at the store. She bought a total of 18 items. Which system of equations can be used to find the number of pencils (x) and pens (y) she

    asked on September 30, 2015
  91. Statistics

    Express the confidence interval (0.033,0.099) in the form of P-E

    asked on July 27, 2014
  92. MATH

    Carolyn and Kim are selling lemonade this summer.  It costs $0.10 to make each cup of lemonade.  They are going to sell each cup of lemonade for $0.25. a. What is the total cost to make 55 cups of lemonade? Show or explain your work.$5.50 b. If they

    asked on February 20, 2012
  93. AP World History Please help

    What was the nature and extent of the Umayyad Empire? How did the Abbasid Empire differ from the Umayyad Empire? What were the achievements of the Arab phase of Islamic development ending in 750? I just want to know how they want me to answer these

    asked on July 2, 2011
  94. Mathematicas

    Sam and Susie are twins. Sam has as many brothers as he has sisters. Suzie has at least 1 sister, and twice as many brothers as sisters. How many kids are in the family altogether?

    asked on April 17, 2010
  95. Algebra II

    A coin jar contains 3 pennies, 8 nickels, 6 dimes, and 5 quarters. If a coin is chosen at random, what is the probability of choosing a dime? a) 8/11 b) 3/8 c) 3/22 d) 3/11 So I'm confused. I solved this, but my answer was 6/22 --> 3/12 --> 1/4 (this being

    asked on October 28, 2015
  96. Physics - please help me..

    A 1.35 kg mass is suspended from a spring with a spring constant of 189.0 N/m. The spring is attached to a rod which oscillates vertically at a frequency f. For what value of the frequency f will the system resonate?

    asked on February 12, 2014
  97. trigonometry

    A ship is sighted directly east of a lighthouse. Another ship, which is 20m away from the first ship, is observed at a bearing of N25degreesE from the lighthouse. If the first ship is 4.1 km away from the lighthouse, what is the distance of the second ship

    asked on January 6, 2014
  98. World Geo

    "Change the way people think and things will never be the same." -Steve Biko -what is the meaning of this and what made Steve Biko say this.

    asked on February 2, 2017
  99. Math

    John ate some pie for lunch. He left 2/3 of the pie. Jerry ate 1/2 of the remaining pie. How much pie did Jerry eat?

    asked on November 8, 2012
  100. MATH

    Carolyn and Kim are selling lemonade this summer.  It costs $0.10 to make each cup of lemonade.  They are going to sell each cup of lemonade for $0.25. What is the least number of cups of lemonade they need to sell in order to collect $10.00 more

    asked on February 20, 2012

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