Monday
December 9, 2013

# Posts by Nancy

Total # Posts: 623

psychology
For finals week, you had to be prepared for exams in english,math,spanish,italian,and history. how should the sequence of study be arranged to minimize the possibility of interference

math
3 out of 5 students own a pet. 6 out of 11 students own a pet. are the results proportional? explain reasoning

Chemistry
A vessel containing air (79% N2 and 21% O2) at 5bar and 280K is placed in a vacuum and a tiny hole is punched through the lid of the vessel. If the rate of effusion of O2 is 1.25x10^-7mol/s, at what rate is the nitrogen effusing? (in mol/s)

math
the hardware store is 5 blocks east of john's house. sean lives 3 blocks west of the bank, which is 4 blocks south and 2 blocks west of the hardware store. how many blocks and in what direction is sean's house from john's house?

math
the perimeter of rectangle y is equal to its area. rectangle z has the same perimeter as rectangle y. The length of rectangle z is 5 inches and the width is 3 inches. Explain how you can find the length and width of rectangle y.

Physics
You throw a ball downward from a window at a speed of 2.7 m/s. How fast will it be moving when it hits the sidewalk 2.9 m below?

Chemistry- rate laws
CH3CHO decomposes into methane gas and carbon monoxide gas. This is a 2nd order reaction. Rate of decomposition at 140 degrees Celsius is .10M/s when the concentration of CH3CHO is .010. What is the rate of the reaction when the concentration of CH3CHO is .50M? Have not been a...

math
1-How many three digit numbers are even? 2-how many three digit numbers are not even and do not divide by 5 ?

math
How many three-digit numbers are even ?

math
How many four-digit numbers divide by 5 ? Note:0001 is considered a 1-digit number .

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