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##### Base e and the Natural Logarithm

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**Base e and the Natural Logarithm**Section 10-5**The Natural Base**• The natural base is represented by lower-case e • e is a constant (like π), e≈ 2.718 • On TI-83: • For e, press [2nd] [] • For e^(, press [2nd] [LN] (next to 4)**You-Try #1**• Use your calculator to estimate the following to four decimal places.**Natural Logarithm**• A logarithm with the natural base e is called a natural logarithm • On TI-83, press [LN] (next to 4)**You-Try #2**• Use a calculator to estimate the following to four decimal places.**Example 5**• Solve for x**You-Try #5**• Solve for x**Example 7**• Solve for x**You-Try #7**• Solve for x**Assignment**• Page 557 #20-27 ALL, 39, 43, 47, 51