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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