Growth and Decay and Integral Review

The half-life of strontium-90 is 25 years. How much of a 4 gram sample of strontium-90 will remain after 100 years?

• 0.25 g

• 0.25 mg

• 0.3 g

• 3.0 mg

Tags

CCSS.HSF.LE.A.4

The half life of C-14 is 5730 years. How many grams will be left of a 100 gram sample of radioactive C-14 after 2865 years?

Round your answer to the nearest hundredth of a gram.

• 3.12 grams

• 8.80 grams

• 70.70 grams

• 141.43 grams

Tags

CCSS.HSF.LE.A.4

The half-life of isotope XY is 2 years. How many years would it take for a 4.0 mg sample of XY to decay and have only 0.5 mg of it remain?

• 7.09 years

• 3.24 years

• 12.68 years

• 6.04 years

Tags

CCSS.HSF.LE.A.4

There are 28 fish in my pond. The population of fish triples every 5 weeks. How many fish are there in 14 weeks?

• 458,752 fish

• 756 fish

• 607 fish

• 1960 fish

I have 5 emails in my inbox. The number of emails in my inbox the day before a test double every 4 hours. How many emails does Ms. Tucker have after 12 hours?

• 40 emails

• 20,480 emails

• 15 emails

• 240 emails

Tags

CCSS.HSF.LE.A.4