Tuesday
December 10, 2013

# Posts by cynthia

Total # Posts: 511

calculus
Using L'Hôpital's rule, evaluate lim of xe^(-x) as x approaches infinity

calculus
Find the average value of the function f(x) = (2x - 5)^2 on the interval [1, 2].

Earth Science
In what ways can sea level be lowered? What effect might this have on existing life forms? I can't find it in my textbook. Can somebody helps??????? THANKS A LOT!!!!!

Earth Science
How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to the same river? Can anyone please help?????? THANKS A LOT!!!!!

Physics
A 6 µC charge is placed at the origin and a second charge is placed on the x-axis at x = 0.34 m. If the resulting force on the second charge is 4.0 N in the positive x-direction, what is the value of its charge?

Chemistry
Since the oxidation number of Chromium is +3, and the oxidation number of Silicon is -4. Why is the chemical formula for Chromium III Silicide Cr3Si2? Can somebody please explain to me please???????THANKS A LOT!!!

Chemistry
Oxygen has a boiling point of 90K, and nitrogen has boiling point of 77K. Which is a liquid and which is a gas at 80K? I tried to look into the phase diagrams, but I still don't understand. Can somebody please help and explain to me??? THANKS A LOT!!!

math
How did math originate?

math for elemetary school teachers
need to create a number system using only: A=1, B=2, C=3, D=4 and Zero=0. Help

finance
The company has an open invoice for \$100 but then chooses to take the 2% discount offered and pay \$98 if paid within 10 days.

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