1.5 Exponential Functions Monday, August 30, 2004.

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1.5 Exponential Functions Monday, August 30, 2004

Exponential Functions

Rationals and Irrationals

Laws of Exponents

Applications of Exponents Exponential function occurs very frequently in models of nature and society Examples: population growth, radioactive decay

Radioactive Decay Example The half-life of strontium-90 is 25 years. a. If a sample of strontium-90 has a mass of 24 mg, find an expression for the mass m(t) that remains after t years. b. Find the mass remaining after 40 years. c. Estimate the time required for the mass to be reduced to 5 mg.

The number e

More about e Slope of the tangent line y=2 x m ≈.7 y= 3 x m ≈ 1.1 y=e x m = 1 e ≈

Assignment for Section 1.5 Page 62 – 3, 15, 18,22,26

Hand-In Assignment #1 Due Friday, September 3 Page 23: 20, 24, 26, 40, 52 Page A32: 32, 48, 56, 58, 72 Page 62: 16, 20