At a certain bookstore, you get a $5 coupon for every 4 books you buy. What is the least number of books you could buy to get $1
2 answers:
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Answer:
A. Yes, because by 2206, the radioactive element remaining in the area is less than 800 Bqs.
Step-by-step explanation:
Function for the amount of radioactivity:
The function for the amount of radioactivity, in t years after 1996, is given by:
Find f(220) to determine the amount of becqurels in 2206.
121.42 < 600, so the area will be safe, and the correct answer is given by option A.