- Defination of primary and secondary standard substance?

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Yahoo hasn't been updating category leader boards for about a month..Have they permanently quit doing that? Can someone help me solve this math problem. find m: < ABC? Simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28? One fifth plus thirty three divided by one fifth? What is the amplitude of the motion? What is the angular frequency?