Since Life Expectancy Has Increased in the Last Century, the Number

Multiple Choice

Since life expectancy has increased in the last century, the number of Alzheimer's patients has increased dramatically. The number of patients in the United States reached 4 million in 2000. Using data collected since 2000, it has been found that the data can be modeled by the exponential function where x is the years since 2000. Estimate the Alzheimer's patients in 2025. Round to the nearest tenth.

A) 8.0 million
B) 3.9 million
C) 4.8 million
D) 7.8 million