Find the volume of the indicated region.the region that lies under the plane 
and over the triangle with vertices at 
, 
, and 
A. 6
B. 
C. 12
D. 
Answer: A
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Find the indicated sum. Find the sum of the first 8 terms of the geometric sequence: 
, 
, 
, 
, 
, . . .
A. 
B. 
C. 
D. 
Find parametric equations for the tangent line to the curve with parametric equations x=3t, y=5t², z=4t³ at the point with t=1.
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Indicate whether the statement is true always, sometimes, or never.When i is raised to an even power, the result is -1.
A. Always B. Sometimes C. Never
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