Precalculus (Question In description)

Question

The half-life of radioactive strontium-90 is approximately 29 years. In 1965, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 6 percent of the original amount absorbed remains?

Answer 1

0.6 = (0.5)^t/29

Use ln to solve for t.