### Home > CCG > Chapter 10 > Lesson 10.3.5 > Problem10-177

10-177.

At $\text{10:00 a.m.}$ a radioactive material weighed $2$ grams but at $\text{6:00 p.m.}$ it only weighed $0.45$ grams. What were the approximate hourly multiplier and the hourly percent of decrease?

Substitute the given information into an exponential function to solve for the desired values.

$≈ 0.83$ or a $17\%$ decrease