08/07/16

What is the sum of the first 7 terms of the geometric series: -8 + (-4) + (-2) + (-1) + (-1/2)+...
I don't know how to do need one done to see how it's done. 
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08/07/16

I need Chemisty help.
When propane (C3H8) is combusted it has an enthalphy of reaction of -2044 kJ/mol. A 1.00 L cylinder of propane starting at 12.50 atm and 30.0 0C is completely combusted to heat water. How many... more
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08/02/16

1st order differential equation
Solve y'+((1-2x)/x)y=e^(2x)
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02/12/14

Chemistry problem about pH.
Can anyone help me with this problem? I can't get the answer, there must be something wrong in my reasoning, thank you so much!   "Calculate the pH of a solution obtained by adding 4 mL of nitric... more
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