The half-life of gold-198 is 2.7 days. After days, 1/4 of the original amount of gold-1988 will remain.

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2. there are 250 students in a school auditorium. use numbers from the box to complete the table. 16, 38, 18, 45, 25, 50, 32, 60 grade number percent of all students of students fifth 24 sixth 95 seventh 20 eight 45