July 29, 2014

Posts by nurul

Total # Posts: 11

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.


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.

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

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?

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.

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 or she reaches the tel...

material & structure laboratory
Is the measured normal consistency lies in the range for the Portland cements?

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

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

social studies
how money is printed in today world

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