Solve the problem.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. 3.9 million
B. 4.8 million
C. 8.0 million
D. 7.8 million
Answer: D
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Perform the indicated operation. Simplify the result if possible.13 ft 10 in. + 8 ft 10 in.
A. 22 ft 10 in. B. 21 ft 8 in. C. 22 ft 8 in. D. 21 ft 10 in.
Factor. Assume that variables in exponents represent natural numbers.512x3a - 125y3b
A. (8xa + 5yb)(64x2a - 40xayb + 25t2b) B. (8xa - 5yb)(64x2a + 40xayb + 25t2b) C. (8x - 5y)(64x2a + 40xayb + 25t2b) D. (8xa - 5yb)(64xa + 40xayb + 25tb)
Estimate the value of the quantity.The table shows the velocity of a remote controlled race car moving along a dirt path for 8 seconds. Estimate the distance traveled by the car using 8 subintervals of length 1 with left-end point values.
A. 114 in. B. 248 in. C. 124 in. D. 129 in.
Solve the problem.The table shows the population of a certain city in various different years. Use regression to find values for a and b so that f(x) = axb models this data, where x represents the number of years since 1990 and f(x) is the population of the city in hundreds of thousands. Round your answers to 4 decimal places.
A. a ? 2.1375, b ? 0.4432 B. a ? 2.6352, b ? 0.4756 C. a ? 1.8506, b ? 0.5121 D. a ? 1.7025, b ? 0.5375