Your question: Cobalt-60 has a half-life of about 5 years. How many grams of a 300 g sample will remain after 20 years?
Answer: <u>C. 18.75g</u>
That's your answer, good luck mate. <u>Remember to always look through notes, so-forth.</u>
Answer:
270 minutes per boy.
Step-by-step explanation:
45 mins each week
multiplies by 6
List B
