1. An account with a balance of $1000 pays 3. 65% annual 1. An account with a balance of $1000 pays 3.65% annual interest compounded daily. What is the balance at the end of 1 year if no money is added to the principal? ANSWER $1037.17 Think: What if this interest was compounded.. Every hour? Every minute? Every second? Continuously?
EXAMPLE 1 Leonhard Euler (1707-1783) Natural base “e”
(5 ) ( ) EXAMPLE 1 Simplify natural base expressions Simplify the expression. a. e2 e5 = e2 + 5 = e7 b. 12 e4 3 e3 = e4 – 3 4 = 4e (5 ) c. e –3x 2 = 52 ( e –3x ) 2 = 25 e –6x = 25 e6x
EXAMPLE 2 Evaluate natural base expressions Use a calculator to evaluate the expression. Expression Keystrokes Display a. e4 [ ] ex 4 54.59815003 b. e –0.09 [ ] ex 0.09 0.9139311853
GUIDED PRACTICE for Examples 1 and 2 Simplify the expression. 1. e7 e4 e11 ANSWER 2. 2 e–3 6e5 12 e2 ANSWER 3. 24 e8 4 e5 6 e3 ANSWER
GUIDED PRACTICE 4. Simplify (ex e –3x)2. 1 e4x ANSWER 5. Use a calculator to evaluate e –0.35. (Round to three decimal places.) ANSWER 0.705