Most popular questions and responses by nurul
  1. chemistry

    Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.

    asked on December 21, 2016
  2. chemistry

    Rank the following compounds in order of decreasing boiling point: sodium fluoride ( \rm NaF ), methane ( \rm CH_4 ), fluoromethane ( \rm CH_3F )

    asked on August 21, 2011
  3. calculus

    A person 150cm tall is walking away from a lamp post at the rate of 15 meter per minute. when the man is 2.5m from the lamp post, his shadow is 3m long. Find the rate at which the length of the shadow is increasing when he is 7m from the lamp post.

    asked on April 18, 2014
  4. math, statistic

    the average of the hemoglobin reading for a sample of 20 teachers was 16 gram per 100 milliliters, with a sample standard deviation of 2 grams. find the 99% confidence interval of the population mean.

    asked on June 14, 2013
  5. math

    A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon to 1.00 pm lunch period. The waiting time (defined as the time elapsed from when the customer enters the line until he

    asked on December 8, 2011
  6. chemistry

    What happens to the physical properties as the strength of intermolecular forces increases?

    asked on August 21, 2011
  7. math

    it is given that y is directly proportional to xn. write down the value of n when (i) y m square is the area of a square length x m . (ii) y cm cube is the volume of a cube of length x cm.

    asked on March 20, 2016
  8. biochemistry

    Calculate the pH of a solution made by adding 75.0 g of CH3COONa to 750 mL of 0.64 M CH3COOH. Ka for CH3COOH is 1.8 x 10-5.

    asked on March 9, 2015
  9. biochemistry

    What mass of CH3COONa must be added to 50.0 mL of 0.50 M CH3COOH to make a solution of pH 6.0 ?

    asked on March 9, 2015
  10. math

    A game is played by drawing 4 card from an ordinary deck and replacing each card after it is drawn.find the probability that at least 1 king is drawn

    asked on June 14, 2013
  11. Financial Acc & Reporting

    Archive bhd acquired a franchise on finance lease. it is required to pay 200000 per annum in advance for five years. the implicit interest rate is 10%. the franchise could be bought for 800000. the legal life is five years but can be renewed at 5000 for

    asked on July 30, 2016
  12. Additional maths

    The roots of the equation x^2+(a+3)x-2b=0 are -2 and -3. Find the values of a and b.

    asked on February 1, 2012
  13. Math

    An n-sided polygon has interior angles of which 4 of them are of sizes 125,220,40 and 295 degrees . The remaining interior angles are of sizes 20 degrees each. Find the value of n, My working: let the number of sides for the polygon be n and the remaining

    asked on December 5, 2014
  14. math

    if x is directy proportinal to y cube and y=2 when x= 1, (a) find an equation connecting x and y. (b) find the value of x when y = 1 (c) find the value of y when x=108.

    asked on March 20, 2016
  15. science

    A mixture of {\rm NaCl} and {\rm NaBr} has a mass of 2.10{\rm g} and is found to contain 0.71{\rm g} of {\rm Na} What is the mass of {\rm NaBr} in the mixture?

    asked on July 28, 2012
  16. material & structure laboratory

    Is the measured normal consistency lies in the range for the Portland cements?

    asked on November 20, 2011
  1. Math

    It's alright. Thank you for your help.

    posted on December 5, 2014
  2. Math

    Why is the answer n=6 ?

    posted on December 5, 2014
  3. Physics


    posted on July 20, 2014
  4. World history

    how money is printed in today world

    posted on April 13, 2011