8.4.1 REVIEW B Test Review

Determine which examples show exponential growth, exponential decay, or neither.

• neither

• exponential decay

• exponential growth

A population of 2,560 elephants is decaying at a rate of 2.3% per year. What would the predicted population be after 10 years?

• 1,971

• 2,029

• 3,214

• 188

The half-life of Radium-224 is 3.7 years. If the initial amount of Radium-224 is 0.15 mg, write the equation that would best model the mass of Radium-224 after t years.

Mathematical Equivalence

ON

An exponential function goes through the points (3,8) and (2,24). Which of the following is the equation of the function?

What is the equation of this graph?

Match the equivalent expressions below using properties of logarithms.

• y=2

• y=3

• y=4

• y=5