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I need an equation for dime and quarter math q that equals to $5.25. TIA!? The Half life of cobalt -60 is 5.26 Years how much of 200 g cobalt -60 will remain after 26.3 Years? Amount=200(1-?)=? How much change you will back from 100 bill if you purchased eight dvds costing $6.49 each? How do i solve 9x+2y=4 and 9x-y=25 using elimination? What are some examples of where an analog output might be useful?