7.2.2 The Natural Base, e − Practice
1. Simplify. ln e −18 t
2. Simplify. e 0.72ln x
3. Simplify.
4. Simplify.
3 5
3 2
e In t 2
x
− e In
5. What is the total amount for an investment of $2150 invested at 5.3% for 16 years and compounded continuously?
6. How long will it take for 475 mg of a sample of radium-225, which has a half- life of about 15 days, to decay to 30 mg?
136
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