The half-life of a radioactive isotope is 6 years. Initially there are 400 grams of the substance. Approximately how much of the isotope remains after 5 years? O 87 grams
O 174 grams
224 grams
577 grams

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

what's that

no

explanation:

you can be freinds, and people but not follow people.