Solve the problem.A certain radioactive isotope decays at a rate of 0.1% annually. Determine the half-life of this isotope, to the nearest year.
A. 500 years
B. 301 years
C. 693 years
D. 7 years
Answer: C
Mathematics
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Find a minimum spanning tree for the graph.
A. 
B. 
C. 
D. 
Mathematics
Find the exact value of the logarithmic expression.ln e9
A. 
B. 1
C. 9
D. e
Mathematics
Provide an appropriate response.Simplify and express your answer in terms of positive exponents: 
What will be an ideal response?
Mathematics
Find an equation for the circle.Center (8, 10), tangent (touching at one point) to the x-axis
A. (x - 10)2 + (y - 8)2 = 10 B. (x - 8)2 + (y - 10)2 = 64 C. (x - 10)2 + (y - 8)2 = 64 D. (x - 8)2 + (y - 10)2 = 100
Mathematics