Which situation can be represented by a single expression? 3
O The product of a and a number is 16.
o iš of a number
Half of a number is 15.
The difference of 20 and a number is 14.
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Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g