Riana

Most popular questions and responses by Riana
  1. math

    A certain antibioyic reducesthe number of bacteria in your body by 10% each dose a) if four doses of the antibiotic are taken, what percent of the original bacterial population is left. b) biologists have determined that when a person has a bacterial

    asked on December 23, 2012
  2. math

    how to determine the acute angle between the line 2x+3y=6 and the y axis?

    asked on January 27, 2013
  3. math

    bricks are stacked in 20 rows such that each row has a fixed number of bricks more than the row above it. the top row has 5 bricks and the bottom row 62 bricks. how many bricks are in the stack?

    asked on January 1, 2013
  4. physics

    a car starts from rest , attains a velocity of 36kmph with an acceleration of 0.2m/s^2 travels 9km with this uniform velocity and then comes to halt with a uniform acceleration of 0.1m/s^2 find the total time of travel of the car.

    asked on May 20, 2012
  5. ELA

    What are character trait for Moon Shadow from Dragonwings but written in an acrosric poem way?

    asked on May 20, 2014
  6. math

    first term of the arithmetic sequence is 13. two other terms of the sequence are 37 and 73. common difference is consecutive terms integers. determine all possible values for 100th term.

    asked on January 2, 2013
  7. math help!

    a hockey arena has a total seating capacity of 15690.the first row of seats around the rink has 262 seats. the number of seats in each subsequent row increases by 18. how many rows of seats are in the arena?

    asked on January 27, 2013
  8. PHYSICS'S

    How much heat would it take to change 1.0kg of water at 20°C to steam at 110°C. I can't get the right answer that is 2.6×10^6J. Please tell me how can I solve this problem, I want to learn how to solve These problem plz help me.

    asked on March 31, 2013
  9. chemistry

    25g of NaCl is deissolved in 100g of water. what is the concentration in percentage by mass?

    asked on January 29, 2013
  10. chemistry

    Element x is composed of isotopes x-56 mass 56.0 u and x-59 mass 59.0 u. What is the percentage abundance of each of these isotopes if the atomic mass is 57.3 u?

    asked on December 26, 2012
  11. chemistry

    A saturated solution of kno3 at 70°c is cooled to 10°c. What mass of a solid of precipitate out of solution.

    asked on December 19, 2012
  12. Math

    Someone please help me, I do not understand how to solve this problem: Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with σ = 2.0%. A random sample of 10 bank stocks gave the

    asked on December 11, 2016
  13. math

    the population of a town is declining at a rate of 4.1% per year. the current population is 25000. 1)what will the population be in 7 years. 2) how long will it take the population to reach 15000?

    asked on December 12, 2013
  14. math

    t8=1024 and decrease by 2/3. what will be the sum of the first 7 term. i don't know what shud i do first to solve it.

    asked on January 2, 2013
  15. Physics

    what can be the source of error in lab of forces equilibrium,force board lab?

    asked on September 26, 2013
  16. Math

    Here is the question:Consider a data set of 15 distinct measurements with mean A and median B. (a) If the highest number were increased, what would be the effect on the median and mean? Explain. The mean would remain the same while the median would

    asked on December 14, 2016
  17. chemistry

    how to find the pressure exerted by the hydrogen alone? and the volume of dry hydrogen at SATP? i have room temperature=23C room pressure =101.62kPa volume of h2 gas & H2O vapour collected =43.2ml temperature of water = 23C length of Mg ribbon = 3.00cm

    asked on January 22, 2013
  18. Math

    The sum of two numbers is 70. When the smaller number is subtracted from the bigger number, the result is 24. Find the numbers.

    asked on January 12, 2016
  19. ANSWER ASAP!!!!!!! PHYSICS

    a small airplane is dropping a probe in a remote area in antarctica in a narrowly specified location. the probe in a protective shell can not land any harder than with a maximum speed of 60m/sec at landing, while the plane has to move at a minimum speed of

    asked on April 10, 2015
  20. chem

    Why is it expected that 2/10 of the ejected electrons will cone from the n=1 shell, and 8/10 ofthe electron from the n=2 shell?

    asked on February 17, 2014
  21. chemistry.....help plz

    what is the density of methane gas at 20 degree and 115kpa?

    asked on January 29, 2013
  22. Physics

    the distance between two successive crests in waves is 1.50m, and the source generates 25 crests and 25 troughs in 5.00sec. what is the speed of the waves?

    asked on June 16, 2013
  23. chemistry

    what is the density of methane gas at 2o degree and 115kpa?

    asked on January 29, 2013
  24. physics

    a bullet initially moving with a velocity 20m/s strikes a target and comes to rest after penetrating a distance 10cm in the target calculate the retardation/deceleration caused by the target.

    asked on May 20, 2012
  25. PHYSICS help please!!!!!!!!!!

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked on March 31, 2013
  26. biology

    why are yeast classified as eukaryotes? i know they are in kingdom fungi and all the members are eukaryotes but why?

    asked on January 7, 2013
  27. English

    In the book Dragonwings, after saving Black Dog's life in the alley near the opium den, why does Windrider tell Moon Shadow to remember that Black Dog was once a good man?

    asked on June 8, 2014
  28. computer sicence C++

    Americans spell differently from Canadians. Americans write "neighbor" and "color" while Canadians write "neighbour" and "colour”. Write a program to help Americans translate to Canadian. Your program should interact with the user in the following way.

    asked on September 28, 2013
  29. chemistry

    peice of sodium metal reacts with water. 246ml volume of hydrogen gas was collected over water at 25 celsius and at an atmospheric pressuric pf 101.3 kpa. what was the pressure of dry hydrogen? what is the mass of sodium used up by the reaction?

    asked on January 29, 2013
  30. math help!

    (2-√2)/(3+√2) can you plz tell me how to solve it? plz hurry up

    asked on January 25, 2013
  31. math

    the 10th term is 34 of arithmetic series and the sum of the 20th term is 710.what is the 25th term?

    asked on January 1, 2013
  32. CHEMISTRY.

    what would be the VSEPR shape of pyridine?

    asked on March 12, 2014
  33. PHYSICS

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked on March 31, 2013
  34. physics

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked on March 31, 2013
  35. can any smart person in c++ can answer this?

    A “magic” number is an integer in which the number is equal to the sum of the cubes of its digits. Write a program to determine whether a three digit number entered by the user is a magic number.

    asked on February 10, 2013
  36. math help!

    48,36,27,81/4........... general term?

    asked on January 1, 2013
  37. C++ programming

    write a program C++ program and Use a recursive function that finds the n-th term using the following rule: tn=3tn-1+12tn-2 . please help me out!

    asked on April 3, 2013
  38. Physics

    A force of 2000N is used to push a box up am inclined plane that is 15m long. If the 100 kg box is raised to a height of 8m,how much work is done against friction ?let g=10m/s^2.

    asked on April 2, 2013
  39. PHYSICS

    1kg of fat is equal to 30MJ of energy.the efficiceny of converting fat to energy is 20%. suppose you life a mass of 12kg 2.0m vertically,500 times, how much work do you do? if all the energy used to do the work comes from the burning fat how much fat is

    asked on April 1, 2013
  40. physics

    At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

    asked on March 31, 2013
  41. english poem

    plz can anyone check my poem and mark my correct my mistakes. Lasts Forever once aparted, never met again never saw the wound heeling again once desired, beyond dreams no one i saw blessed anymore once hurtled, smashed from the roots never saw a tree

    asked on January 13, 2013
  42. chemistry

    what can be the source of error in titration?

    asked on December 28, 2012
  43. CHEMISTRY.

    what would be the VSEPR shape of pyridine?

    asked on March 13, 2014
  44. Physics

    what can be the source of error in lab of forces equilibrium,force board lab?

    asked on September 26, 2013
  45. english poem

    As fair as morn, as fresh as May, a pretty grace in saying nay, Smil'st thou sweetheart? then sing and say, Ta na na no, But O! that love enchanting eye, Lo, here my doubtful doom I try, Tell me my sweet, live I or die? She smiles, fa la la la, Ah, she

    asked on January 14, 2013
  46. math

    how would i find the sum of the 7 term. if i have 1st term = 11 and 7th term = 704.its a geometric series. i don't know how to find the difference?

    asked on January 2, 2013
  47. math help!

    the 10th term is 34 of arithmetic series and the sum of the 20th term is 710 i.e S20=710.what is the 25th term?

    asked on January 1, 2013
  48. engliSH

    The opposite of withdraw is? a) Shocked b) puzzled C) relieved D) revealed

    asked on December 15, 2013
  49. Physics

    what is the relationship between forces in equilibrium and their components?

    asked on September 29, 2013
  50. PHYSICS

    1kg of fat is equal to 30MJ of energy.the efficiceny of converting fat to energy is 20%. suppose you life a mass of 12kg 2.0m vertically,500 times, how much work do you do?

    asked on March 31, 2013
  51. PHYSICS......

    Q1.a building has three alternative routes from the ground to the first floor. i)a flight of stairs at an angle of 45 degree. ii)a near flight ladder angle 85 degree. iii)a long zig-zag slope at an angle of 15 degree. what are the disadvantages and

    asked on March 26, 2013
  52. math

    how to we convert one currency to another is there any formula? or plz give me an example. i have no idea how do we convert.

    asked on February 20, 2013
  53. math

    term given by x+2,3x-1,and 4x-1 form an arithmetic sequence. find the value of x. i didn't get it how to start this question and how it forms arithmetic sequence?

    asked on January 9, 2013
  54. chemistry

    What might be the major factor for leads ability to absorb x rays. Describe any practical advantages lead has for its use in x rays absorbtion.

    asked on December 25, 2012
  55. chemistry

    What is the allowable concentration of six organic pollutants in drinking water?

    asked on December 22, 2012
  56. chemistry

    What is the allowable concentration of six organic pollutants in drinking water?

    asked on December 22, 2012
  57. chemistry

    What are four origins of pollutants in natural water?

    asked on December 22, 2012
  58. chemistry

    150.0ml of iron(iii)chloride solution is mixed with 180.0ml of the sodium hydroxide solution,1.65g yield of experimental iron(iii)hydroxide is obtained.find the theoretical yeild of the precipitate. how you find that ?

    asked on December 14, 2012
  59. chemistry

    150.0ml of iron(iii)chloride solution is mixed with 180.0ml of the sodium hydroxide solution,1.65g yield of experimental iron(iii)hydroxide is obtained.find the theoretical yeild of the precipitate. how you find that ?

    asked on December 14, 2012
  60. chemistry

    1) what mass of lead(ii) acetae is required to be dissolved in a 500.0ml volumetric so that the acetate is equal to 1.48?

    asked on December 14, 2012
  61. Math

    y=3x^2=5x-1 how to sole it with partial factoring?

    asked on January 22, 2013
  62. CHEMISTRY.

    Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

    asked on December 15, 2013
  63. CHEMISTRY.

    Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

    asked on December 15, 2013
  64. CHEMISTRY.

    Lowering of vapor pressure is directly proportional to: a) Temperature b) Mole fraction of Solute c) Mole fraction of Solvent d) Amount of solution

    asked on December 15, 2013
  65. PHYSICS!!!!!!!! HELP!!!!!!!

    Can someone give me an example of a problem where you have to find electric field and magnetic field using an electron gun?

    asked on December 10, 2013
  66. Physics

    what is the relationship between forces in equilibrium and their components?

    asked on September 26, 2013
  67. Physics

    what is the relationship between forces in equilibrium and their components?

    asked on September 26, 2013
  68. Physics

    what is the relationship between forces in equilibrium and their components?

    asked on September 26, 2013
  69. Computer language.

    a program that prints all the numbers from 1 to 1000 that are divisible by 7. (in C++)

    asked on February 9, 2013
  70. C++

    a program to sort three values (from smallest to largest) entered from the keyboard. Algorithm: 1. INPUT a,b and c 2. If a greater than b If a greater than c If b greater than c The order is a, b, c Else The order is a, c, b Else . . . How will i code

    asked on February 6, 2013
  71. physics

    how do we find the interpolation from a graph to determin the number of images which should be observer with a mirror angle of 90 degree and how do we calculate the line equation.

    asked on February 1, 2013
  72. chemistry

    how can i sketch a heating curve for benzene (mp=5.5 celius and bp=80.1 celeus?

    asked on January 29, 2013
  73. ms sue

    triangle base is (4-x)cm and its height is (2x+3)cm.what will be the maximium area?

    asked on January 28, 2013
  74. math problem. help

    triangle base is (4-x)cm and its height is (2x+3)cm.what will be the maximium area?

    asked on January 28, 2013
  75. math help!

    how to find the points thought which the function goes like if the vertex is 2,5 and it goes through (6,-1) how would i find the other point?

    asked on January 28, 2013
  76. math help!

    how to find the x intercept of d(x)=9x^2-4x+7

    asked on January 28, 2013
  77. math

    point of symmetry? 2(x-7)(X+3) and vertex?

    asked on January 28, 2013
  78. math

    1/2x^2=x/4+1 how can i solve that with quadratic formula?plz i need the solution fast.

    asked on January 28, 2013
  79. english

    birds hidden in nests from fear of cold is this sentence correct?

    asked on January 14, 2013
  80. chemistry

    i have to find the ratio of naoh:mass of KHP. but i have volume oh NaOH and mass of KHP and i don't know how to find the ratio then plz help me right now.

    asked on January 9, 2013
  81. math

    t11=19 and t17=61.then what will be S12? arithmetic series question

    asked on January 1, 2013
  82. math

    1+2+3+...+100 how to find the sum of it.

    asked on January 1, 2013
  83. math

    1,1,2.3,5....... what can be the general term for this?

    asked on January 1, 2013
  84. math

    i) xy=100 ii) 9x^2+y^2=16 Are these both function or nor a function? if so then how?

    asked on December 27, 2012
  85. math

    y=(3/x)-1 How will i find the domain and range?

    asked on December 27, 2012
  86. math

    9(a+b)^2-(a-b)^2 how would you factor that?

    asked on December 26, 2012
  87. English

    fire and ice poem by robert frost. i have to write about how...... This poem appeals to beacause..... can someone tell me what that means actually like what should i write.

    asked on December 25, 2012
  88. chemistry

    Only pure substance are homologous,true or false? Can you please explain too?

    asked on December 25, 2012
  89. chemistry

    What is tag name for the smallest particleof covakentlg bonded ccompound?

    asked on December 25, 2012
  90. chemistry

    what are four examples of solution for which the concentration must be known?

    asked on December 22, 2012
  91. chemistry

    why do we perform tritation many times ?

    asked on December 22, 2012
  92. English

    how to start writing a poem?

    asked on December 22, 2012
  93. chemistry

    how do i find ratio of volumeHcl/volumeNaoh for my first trail of titration?

    asked on December 22, 2012
  94. chemistry

    if two solutions are prepared for the reaction.4.62g of Iron(iii)chloride in a 250ml columetric and for the sodium hydroxide,2.50g of solute in a 200ml volumetric flask is mixed.write two equations that describe the dissociatin of the ionic solids in water

    asked on December 14, 2012
  95. maths

    1 a boy was employed on the understanding that he was to receive 'p' paise for everyday he worked and 'q' paise for everyday when there was no work for him after 'd' days his total earnings amounted to rupees x how many days had he worked

    asked on May 21, 2012
  96. chemistry

    the mass number of an element is 18 it contains 7 electrons what is the number of protons and neutrons in it what is atomic number of an element.

    asked on May 19, 2012
  97. Math

    5x^2+5x-2 how to find the root?

    asked on January 22, 2013
  98. chemistry

    why mass of mg is determined indirectly by measuring its length instead of passing by balance?

    asked on January 23, 2013
  1. Math

    The elapsed time is 2 hours and 39 minutes

    posted on January 8, 2018
  2. Math

    Thank you for helping! So for part: a) Both the mean and median would remain the same. b) The mean would decrease while the median would remain the same.

    posted on December 14, 2016