Friday
May 24, 2013

# Posts by annie

Total # Posts: 496

math
For a fundrasier, the Best Buddies club sold t-shirts. The adult shirts were \$15 per shirt and the youth shirts were \$12 per shirt, and they made a total of \$330 on the shirts. If they sold a total of 26 shirts, how many of each did they sell? I don't understand this, so p...

Physics
A 0.03-kg bullet is fired vertically at 200m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of 37m. (a). What was the speed of the baseball/bullet right after the collision? ...

Math
At a concession stand, popcorn costs \$1.10 and nachos cost \$2.35. One day, the receipts for a total of 172 popcorn and nachos were \$294.20. How many popcorns were sold. Please show work! I don't understand

Chemistry
calculate the enthalpy change for: (enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. enthalpy of formation of liquid water is -285.8 kJ/mol) 2Na + 2H2O = 2 NaOH + H2

chemistry
a weather balloon partially filled w/ 33.5 L of helium @ 18 deg C & .95 atm. what volume will helium occupy @ -23 deg C w/ a pressure of 3 x 10 to the -3 atm?

chemistry
calculate the # of moles of oxygen in 2 L @ 24 deg C & 750 torr

Chemistry
# of moles of oxygen in 2 L @ 24 deg C & 750 torr?

chem hwk help!
Given the following reaction: 3 CaCl2 + 2 H3PO4 Ca3(PO4)2 + 6 HCl How many grams of H3PO4 are needed to react completely with 1.837 g of CaCl2? I don't understand at all

chemchemchem
thad do you know how to do #13?

chemchemchem
yes! thank you it worked!

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