- Can someone help me answer this chemistry question?

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Is 1g NaCl tablet that can be bought in drugstores the same as 1g NaCl powder? Whats 49 over 64 in simplest form? A boat is crossing a river ata speed 44mph. The river current is traveling 10mph at a right angle. What is the boats resultant velocity? A penny is dropped it takes a total time of 4.62 to reach the ground, how high was it dropped from? Prove that for all n>=9 that there exist natural numbers x,y s.t. n=2x+5y.?

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