Solve the problem.A certain radioactive isotope decays at a rate of 0.275% annually. Determine the half-life of this isotope, to the nearest year.

A. 3 yr
B. 182 yr
C. 109 yr
D. 252 yr

Answer: D

Mathematics

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Solve the problem.What is the ratio of the circumference of the circumscribed circle to the circumference of the inscribed circle?

A. 3 : 2
B.  : 1
C. 2 : 1
D. 4 : 1

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Mathematics

Factor.5x2 - 50x + 125

A. 5(x - 5)(x - 5) B. 5x2 - 50x + 125 C. (x - 5)(5x - 25) D. 5(x - 25)(x + 1)

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Mathematics

Any two polygons that are similar to each other are also congruent to each other.

Answer the following statement true (T) or false (F)

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Mathematics

Solve the equation for the specified variable.S = 2?rh + 2?r2  for h

A. h = 2?(S - r)
B. h =  - 1
C. h = S - r
D. h = 

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Mathematics