# college algebra

posted by
**Dee** on
.

In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.)

_____ yr

posted by
**Dee** on
.

In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.)

_____ yr