Describe the domain of the function of three or more varables.f(x1, x2, ..., xn) = 
A. All points in ?4 that satisfiy x12 + x22 + ... + xn2 ? 0.
B. All points in ?n except the origin (0, 0, ..., 0).
C. All points in ?4 that satisfy x1 > 0, x2 > 0, ..., xn > 0.
D. All points in ?n.
Answer: B
Mathematics
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A. 19 B. 17 C. -17 D. -19
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+ 
- 
+ 
A. 
B. 
C. 
D. 
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Solve the problem.A fossilized leaf contains 24% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 34,925 B. 25,629 C. 2213 D. 11,509
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