Popular questions and responses by Niki
  1. physics

    A metal sphere of radius r is dropped into a tank of water. As it sinks at speed v, it experiences a drag force F given by F = kr v, where k is a constant. What are the SI base units of k?

    asked on January 12, 2012
  2. math

    A bottle of water costs $1.50. Explain how you would make a graph of four ordered pairs to model the total cost of the water in terms of the number of bottles.

    asked on June 16, 2014
  3. Chemistry

    What is the balanced ionic equation between bromine and sodium bisulfite??? thanks

    asked on March 1, 2010
  4. Math

    Lee Lu is paid $12.50 per hour, with overtime pay of time-and-a-half for Saturday work and double time for Sunday. Calculate her gross pay if she worked 35 hours during the week, 5 hours Saturday and 3 hours Sunday.

    asked on February 22, 2014
  5. physics

    An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If,

    asked on April 22, 2011
  6. MATH


    asked on January 31, 2019
  7. Statistics

    A basket ball player makes 70% of her free throws. She takes 7 free throws in a game, and makes 5 of her 7 throws. If the shots are independent of each other, Then what is the probability that she makes the first five and misses the last 2?

    asked on March 3, 2017
  8. Physics

    An outfielder throws a baseball to home plate with a velocity of +15 m/s and an angle of 30°. When will the ball reach its highest altitude? (Points : 3) 1.2 s 1.5 s 0.77 s 0.50 s

    asked on January 15, 2015
  9. Math

    Gina's base pay rate is $12.25 per hour, with overtime pay of time-and-a-half, and double-time for holidays. Calculate her gross pay if she worked 4.5 holiday hours in addition to 39 hours Monday through Saturday Is this the proper way to set it up: (12.25

    asked on February 22, 2014
  10. chemistry

    As pure elements. all of the halogens are diatomic molecular species. their melting points are: F2, 85 K, Cl2 239 K, Br2 332 K, and I2 457 K. using periodic table, how can i predict the molecular formula of elemental astatine. at the only radioactive

    asked on June 5, 2013
  11. chemistry

    The solubility of compound A in ethanol is 0.8 g per 100 mL at 0°C and 5.0 g per 100 mL at 78°C. What is the minimum amount of ethanol needed to re-crystallize a 12.0 g sample of compound A? How much would be lost in the re-crystallization, that is,

    asked on February 8, 2010
  12. English

    My friend Jorge can play the guitar and sing. play is underlined would this be: part of a compound subject part of a compound verb phrase- part of a simple predicate I think its b.

    asked on October 1, 2014
  13. Chemistry

    How would the titration curve of hydrochloric acid solution differ if barium hydroxide was used to titrate instead of sodium hydroxide? How would the titration curve of hydrochloric acid solution with sodium hydroxide differ from the titration curve of

    asked on March 6, 2012
  14. Math

    Suraya has x apples and 8 oranges.How many apples and oranges does Suraya have altogether?Give your answer in terms of x.

    asked on January 16, 2015
  15. Physics

    An aircraft has a cruising speed of 100 m/s On a particular day, a wind is blowing from the west at 75.0 m/s If the plane is pointed due north, what would be the magnitude and direction of the velocity relative to the ground? If the pilot wishes to have a

    asked on October 16, 2013
  16. chem

    H2o2+3i+2h -----> I3+2H2o In the first 10.0 second of the reaction the concentration of I dropped from 1.000M to 0.868M a) calculate the average rate of reaction for iodine in this time interval. b) Determine the rate of change in the concentration of H

    asked on October 15, 2013
  17. Chemistry

    A 7.85 g sample of a compound with the empirical formula C5H4 is dissolved in 301 g of benzene. The freezing point of the solution is 1.05C below that of pure benzene. what are the molar mass and molecular formula of this compound?

    asked on October 1, 2013
  18. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

    asked on April 15, 2011
  19. Maximum and Minimum

    Its been awhile since I have done compleating the square, can you please help me? Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point. 19.f(x) = x2 - 2x + 1 And how

    asked on October 14, 2007
  20. Math

    Is the magnitude of an earthquake related to depth below the surface at which the quake occurs? Magnitude: 2.9,4.2,3.3,4.5,1.6,3.2,3.4,3.9 Depth:5.0,10.0,11.2,10.0,7.9,3.9,5.5,8.1 Equation: y=4.12+1.06x Question: does it make sense to predict the depth

    asked on November 12, 2017
  21. algebra

    for the function g(x)=5x^6-3x^3+x^2-x, list the possible rational zeros of g(x) and then use synthetic division to factor g(x) completely.

    asked on April 16, 2013
  22. math

    there are 1,320 ways for three students to win first,second,third place during a debate match. how many students are there on the debate team? explain your reasoning

    asked on April 25, 2012
  23. statistics

    1. On final examination in Business Law, the mean was 68 and the standard deviation was 12. Determine the standard scores of students receiving marks of 50?

    asked on September 27, 2011
  24. calculus

    A container company is tasked to make an open-top rectangular box with a square base. The box must have a volume of 108cm^(3). let the length of the sides of the square base be x cm and the height h cm. (1) what value of x will produce the minimum outer

    asked on August 4, 2011
  25. physics

    The temperature of 4.60 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in

    asked on April 22, 2011
  26. Chemistry

    write balance chemical equation for gaseous hydrogen gas to form gaseous methane ch4 and liquid water.

    asked on October 7, 2010
  27. Organic Chem

    What is the product formed from the nitration of 1,2-dimethoxybenzene ( veratrole)? What would be the equation for the reaction. Details. Veratrole was mixed with glacial acetic acid.This mixture was then added dropwise to a solution of nitric acid and

    asked on March 2, 2010
  28. geometry

    what the angle between the tangents at T?

    asked on January 5, 2009
  29. Science

    Which is the number haploÏde of an organism possessing 18 pairs of equivalent chromosomes?

    asked on November 24, 2008
  30. Chemistry

    Two vessels are labeled A and B. Vessel A contains NH3 gas at 70°C, and vessel B contains Ne gas at the same temperature. If the average kinetic energy of NH3 is 7.1 10-21 J/molecule, calculate the mean-square speed of Ne atoms in m2/s2.

    asked on October 13, 2008
  31. Chemistry

    When 34.5 L ammonia and 39.5 L oxygen gas at STP burn, nitrogen monoxide and water are produced. After the products return to STP, how many grams of nitrogen monoxide are present? 4NH3+5O2->4NO+6H2O

    asked on October 13, 2008
  32. Chemistry

    How many grams of phosphorus react with 31.3 L of O2 at STP to form tetraphosphorus decaoxide? P4(s) + 5 O2(g) -> P4O10(s)

    asked on October 13, 2008
  33. Algebra- Maximum and minimum.

    I don't understand how to find the maximum and minimum. Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point. 15.f(x) = -x2 + 2x - 4 20.f(x) = 2x2 - 4x 19.f(x) = x2 -

    asked on October 13, 2007
  34. Math

    The amount of money in cents in a jar containing d dimes and some nickels and quarters if there are 8 times as many nickels as dimes and 2 times as many quarters as nickels

    asked on August 12, 2019
  35. Statistics

    The length of pregnancies are normally distributed with a mean of 273 days in the standard deviation the 15 days. If 36 women are randomly selected find the probability that they have a mean pregnancy between 273 days in 275 day

    asked on July 9, 2019
  36. Physical education

    Did social class impact Althea Gibson life and career? How?

    asked on April 20, 2019
  37. math

    Enter your answer and show all the steps that you use to solve this problem in the space provided. A party store offers small balloons and large balloons. You can choose from pink, blue, green, and yellow balloons. You can choose from silver, gold, and

    asked on February 20, 2019
  38. Math

    The results of a survey are shown. In the survey, 92 students said their favorite dessert is candy. Pie: 15% Candy: 23% Cake: 27% Ice Cream: 35% 1) How many students were surveyed? students 2) How many students said their favorite dessert is cake? students

    asked on February 11, 2019
  39. History

    How does the Salem Witch Trials relate to women and work?

    asked on February 7, 2019
  40. English

    How do I write a persuasive thesis statement on distracted driving?

    asked on November 12, 2018
  41. English

    I need help starting my standard views essay or they say I say template. Americans today believe that blank I just need a couple of options to start it. Thank you

    asked on September 2, 2018
  42. Story Problem

    Two bikers bike4 miles north and 6 miles west. What is the shortest distance they must travel to get to their starting point?

    asked on March 7, 2018
  43. Science

    Is the Yacca Mountain facility currently in use? Why or why not?

    asked on February 28, 2018
  44. English

    What could be a theme statement for the poem Sympathy by Paul Laurenece Dunbar? I know the theme such as oppression or imprisonment.

    asked on February 13, 2018
  45. Economic

    Principles of economics: 1.All choices involve costs 2. Conseqences of choices lie in the future How would both of these principals apply to college/career ?

    asked on January 10, 2018
  46. Economic

    What’s the importance of benefits packages when choosing a career?

    asked on January 10, 2018
  47. Science

    what steps could be taken to control emissions levels?

    asked on January 9, 2018
  48. Science

    Would heavy snowfall in the ogallala aquifer region affect the recharge of ghe aquifer over the long term?

    asked on December 10, 2017
  49. Science

    What is the primary land use in the ogallala aquifer area of the U.S?

    asked on December 10, 2017
  50. Math

    a dairy farmer has black and brown milking cows. The farmer wants to know how much milk is produced on his farm daily. The farmer selects 15 black cows and 15 brown cows randomly by their tag numbers and logs the amount of milk produced each day for 1

    asked on November 28, 2017
  51. History

    How successful is the American enterprise system ?

    asked on November 21, 2017
  52. History

    Respond to a statement: The American Free Enterprise system is alive and well. If you don’t mind could you send me a link related to this statement

    asked on November 15, 2017
  53. EPI

    Is creating a responsible budget, savings and investing, and establishing credit worthiness show any key economic principles? Key economic principles: 1. People choose 2. All choices involve cost 3. People respons to incentives 4. The consequences of

    asked on November 3, 2017
  54. Math

    The scores for students are 40,41,42,43,45,47,49,50,51,51,54,57,59,60,61,63,67,69,70,71 What is the percentile for the score 51.

    asked on October 29, 2017
  55. Science

    Explain the key factors that make an area a biodiversity hot spot. Include its abiotic and biotic factors

    asked on October 16, 2017
  56. Social Studies 7th Grade C.C.A

    Hi my name is Niki and I am doing a social studies portfolio and the question is Would You Like To Travel Central America and I have to do research on it and analyze my research then make an itinerary then write a persuasive essay please help me understand

    asked on May 11, 2017
  57. math algebra

    Find an eqaution for the line passing through (1,3) and perpendicular to the line 3y=-2x+6

    asked on November 27, 2016
  58. Physics

    Suppose that at least 14.7 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon?

    asked on November 23, 2016
  59. math algebra

    when only the cold water valve is opened, a washtub will fill in 8 minutes. When only the hot water valve is opened, the washtub will fill in 12 mintues. When the drain of the washtub is open, it will drain completely in 7 minutes. If both the hot and cold

    asked on November 18, 2016
  60. Social Studies

    The First Amendment protects which rights? (Select 2) - the right to own a gun - the right to a fair trial ** - the right to practice a religion (or not) ** - the right to criticize the government - the right of owning property help

    asked on October 5, 2016
  61. Math

    A fertilizer covers 5/8 square foot in 1/4 hour. i don't understand how to work out this math problem. By the way i'm in 6th grade but technically doing advanced math so i'm doing 7th grade math. I don't know how to do this

    asked on September 21, 2016
  62. Social studies

    Branch of goverment that carries out the laws

    asked on August 25, 2016
  63. Calculus

    Find the y-intercept of the tangent line to y= -0.2/sqrt(6+5x) at(2.5,-0.04990597277) Thanks

    asked on March 3, 2016
  64. Math

    Find the y-intercept of the tangent line to y=-0.2/ã(6+5x) at (2.5,-0.0464990554975277) Thanks

    asked on March 3, 2016
  65. Math

    Consider the function f(x) for which f(0)=7 and f'(0)=7. Find h'(0) for th function h(x)= 1/f(x). h'(0)=

    asked on February 29, 2016
  66. Math

    Suppose f(x)=5/(x-2). f'(5)=-5/9. Use this to find the equation of the tangent line to the curve y=5/x-2 at the point (5,(5/3)). write your answer in the form y=mx+b where m is the slope and b is the y-intercept. The equation of the tangent line is.....

    asked on February 29, 2016
  67. Chemistry

    List the grams of bleach solution necessary to provide 0.931g of NaClO(laundry bleach is 8.25% NaClO by weight) and the mL of bleach solution that contains the necessary amount... NaClO=74.442 g/mol. Need 0.931 grams of NaClO. Density of NaClO solution is

    asked on February 10, 2016
  68. Algebra

    which ordered pair in the form (x, y) is a solution of this equation? (x+6)y=9 Possible Answers: A. (12,2) B. (3,1) C. (2,1) D. (4,1)

    asked on January 22, 2016
  69. World history

    How do enlightenment thinkers believe a person should rule ?

    asked on December 17, 2015
  70. Social studies

    True or false To accurately label exact locations on a map, geographers go to that specific location. If false what is correct answer

    asked on September 18, 2015
  71. ds 71

    A company sells its product for $79. The company has marginal costs of $37 and annual fixed costs of $95,000. What is the annual total cost to produce 8,500 units of its product?

    asked on February 9, 2015
  72. chemistry

    40 ml of carbon dioxide was collected and is at 10 degree celsius and at 740 mm pressure.Calculate its volume at STP.

    asked on December 22, 2014
  73. Chemistry

    1)what potential impurities were removed during solventless aldol recrystallzation? 2) two solids with different identities are frequently mixed together & do not melt, why do you suppose that the solids actually melted? (why do you assume that it has been

    asked on October 2, 2014
  74. chemistry

    1) what potential impurities were removed during recrystallzation? 2) two solids with different identities are frequently mixed together & do not melt, why do you suppose that the solids actually melted?

    asked on October 2, 2014
  75. statistics

    the average yearly utility costs on Middleton is $1722 with stdev of 146. assume that the utility costs follow a normal distribution. 1) What would the utility costs have to be so that only 7% of houses in Middleton have utility costs greater than this

    asked on September 29, 2014
  76. Biology question plz

    Which of the following depends on bacteria? conversion of dead organic matter to fossil fuel photosynthesis dissolution nitrogen fixation I think its A but I feel it could also be D, could you plz help?

    asked on September 26, 2014
  77. Finance - Annuities

    Natasha plans to deposit $4,000 per year in her account for each of the next 4 years. Thereafter, she expects to deposit $1,500 per year for another 4 years. All deposits are made at year-end. Interest rates are expected to be 8 percent for the next 2

    asked on January 27, 2014
  78. math

    5s/(s^2-t^2) - s/(s-t)

    asked on September 26, 2013
  79. math

    4c/7c-14 + 6c/14c-28

    asked on September 26, 2013
  80. health 5 grade

    i need help in health subject for my son 5 grade Question 1- connect suppose you have a cold. this affects your physical health. does if affect your mental,emotional,family, and social health, too? explain why or why not. Question 2- practice healthful

    asked on September 6, 2013
  81. chemistry

    Analysis of aluminum-zinc alloy Mass of gelatin capsule 0.1284 g ambient temp. 22c mass of capsule plus alloy sample 0.3432g ambient temp_________K mass of alloy sample, m__________g barometric pressure 745 mm Hg mass of empty beaker 144.5g Vapor pressure

    asked on June 19, 2013
  82. chemistry

    i have to write lab report based on my determination of chemical formula & in lab we did experiment & found out the formula was cucl2*2h2o, in my lab report i have to start with mole to mole ratio how can i start writing that?

    asked on May 29, 2013
  83. algebra

    three students are running a race .how different ways can they finish the race

    asked on September 13, 2012
  84. english

    a group of tourists is being led through a famous cathedral by a guide. one family of four is japenese, but at least three other tourist in the goup ar not. All but five of the group are american what is the least number of tourists that can be in this

    asked on July 24, 2012
  85. math

    In vanessa's coin bank there are 4 times as many quaters as nickels, 2 fewer dimes than nickels, and 15 pennies. the total amount in the bank is $5.80. How many of each coin are in the bank? assign a variable to unknown and write an equation to find

    asked on July 24, 2012
  86. Chemistry

    I don't know how to reply to an answer. First of all thank you! For the question I just asked about the titration curves. Would that mean that titrating with barium hydroxide would take half the volume that is used when titrating with sodium hydroxide? Oh

    asked on March 6, 2012
  87. Chemistry

    If two titrations were completed were completed: 1) the titration of HCl with Na(OH) 2)the titration of HCl with Ba(OH)2 (the concentrations of acid and base for both titrations are the same) How would the titration curves of each solution be different? I

    asked on March 6, 2012
  88. Chemistry

    What is the ph of the final solution when 10 mL of HCl is completely neutralized with 11mL of 0.1M Na(OH)?

    asked on March 6, 2012
  89. calc

    Use the Midpoint Rule to approximate the integral The integral from 2 to 7 of (–1x–6x^2)dx

    asked on January 26, 2012
  90. Algebra

    Write the equation in standard form. (2,8) m=9 What are the steps to do this?

    asked on January 25, 2012
  91. math

    if you know the number of faces on a pyramid you know the number of vertices true or false

    asked on January 23, 2012
  92. statistic

    For a given month, a random sample of 30 sales girls from a superstore has a sample mean of salary of RM 800 with standard deviations of RM 140. Estimate the mean monthly salary for all employees using the 95% confidence interval.(what does mean of 95%

    asked on September 27, 2011
  93. Science

    Of the three local winds, which do you think could be easily harnessed for the generation of electricity by a huge wind farm and why? Land and Sea Breezes,Mountain and Valley Breezes or Chinook and Santa Ana Winds.

    asked on June 15, 2011
  94. chem

    at 40 degree C , the vapour pressure of water is 55.3 mm of hg. calculate the vapour pressure at same temp. of 10%aques solution of urea??

    asked on June 7, 2011
  95. geometry

    How do you find the perimeter of a regular dodecagon whose side is 12cm

    asked on May 19, 2011
  96. math

    How long will it take a given quantity of carbon-14 to lose 99.9% of its radioactivity if the half life is 5730 years? The formula I have been given is Q=ae^rt This is using log and ln functions.

    asked on April 25, 2011
  97. physics

    An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If,

    asked on April 21, 2011
  98. physics

    A glass window pane is exactly 23 cm by 38 cm at 10oC. By how much has its area increased when it temperature is 49oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co

    asked on April 21, 2011
  99. physics

    An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If,

    asked on April 21, 2011
  100. Modern Algebra

    Let F be a field and let f(x), g(x), h(x), and d(x) be polynomials in F[x]. Prove that if d(x)=gcd(f(x),g(x)) and both f(x) and g(x) divide h(x), then f(x)g(x) divides h(x)d(x).

    asked on March 22, 2011


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