Physical science
A copper penny has a mass of of 3gram. The atomic number of copper is 29 and the atomic mass is 63,5gram/mol.what is the total charge of all electrons in the penny?
algebra
the area of a rectangle is 425 square feet. if the perimeter is 84 feet, find the length and the width of the rectangle
8th grade Math
2x - 4 > 6
Math
How can I prove this identity? (1 + sinØ + cosØ):(1 - sinØ + cosØ) = (1 + sinØ) : cosØ
Chemistry
so then for a weak acid weak base titration indicators don't work?
Chemistry
why is a weak acid weak base titration different from strong acid strong base/ weak acid strong base/strong acid weak base?
secondary school
which is the formula that describes process to transform Fe3+ to Fe2+ thanks to HCl in the stomach?
English-Ms. Sue
I need some help with dangling and mismplaced phrases..can you help me?
math
1506-2x=3x=646-x
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