Exponential Functions Section 5.1

Evaluate the exponential functions Find F(-1) Find H(-2) Find Find F(0) – H(1)

Natural Base = e e is an irrational number e is the base used in continuous compounded interest problems Exponential Function Find f(3)

Steps to Graph Exponential Function 1. Find y intercept f(0) 2. Find 2 additional points above and 2 below intercept 3. Horizontal asymptote (x axis unless shifted) 4. As x increases 1. If b>1 then f(x) increases 2. If 0 < b < 1 then f(x) decreases

Graph

Homework

Day 2 Section 5.1 Doubling Time Growth Model = Population at initial time (time = 0) P= Population at time t d = doubling time t = time

Doubling time example The current population of the island of Doon is 500,000 and it is expected to double in 15 years. Estimate the population in 5 years. = 500,000d = 15, t = 5

Half- life Half-life Model = initial amount (time = 0) A= Amount at time t h = half-life in years t = time

Half- life example A radioactive isotope has a half-life of days. If 200 milligrams are given to a patient, how many milligrams are left after 30 days?

Compound Interest P= Principal r= rate n= number of times it is compounded in a year t= number of yers A= amount after t years

Example of compound interest If $10,000 is deposited in an account paying 4.5% compounding weekly, how much will you have in the account in 3.5 years?

Continuous Compound Interest P= principal r= rate t= number of years A= amount after t years

Example Compounded Continuously If 10,000 is deposited in an account paying 4.5% compounded continuously, how much will you have in the account in 3.5 years?

Homework Page , 54,