Solve the problem.A certain radioactive isotope has a half-life of approximately 1400 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 65% of that amount?
A. 490 years
B. 870 years
C. 2120 years
D. 805 years
Answer: B
Mathematics
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Find the curvature ? for the given function.r(t) = 
(1 + t)3/2i + 
(1 - t)3/2j + 
tk
A. ? = 
B. ? = 
C. ? = 
D. ? = 
Mathematics
Rewrite the rational expression with the indicated denominator.
= 
A. 
B. 
C. 
D. 
Mathematics
Convert the units.55.32 m = mm
A. 5532 mm B. 0.0553 mm C. 0.553 mm D. 55,320 mm
Mathematics
Completely factor the polynomial or state that the polynomial is prime.25x2 - 9
A. (5x + 3)(5x - 3) B. (5x + 3)2 C. (5x - 3)2 D. (25x + 1)(x - 9)
Mathematics