Solve the problem.A certain radioactive isotope has a half-life of approximately 1800 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 40% of that amount?
A. 2339 yr
B. 1080 yr
C. 2379 yr
D. 1327 yr
Answer: C
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Find 
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A. 
B. 
C. 
D. 
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (5x + 9y)
A. Domain: all points in the xy-plane satisfying 5x + 9y ? 0; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane satisfying 5x + 9y > 0; range: all real numbers; level curves: lines 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane satisfying 5x + 9y > 0; range: real numbers z ? 0; level curves: lines 
Provide an appropriate response. If the yearly increase in population for a town is 3.5%, explain why 103.5% of the original population represents the new population.
What will be an ideal response?
Find the logarithm using the change-of-base formula. Round to the nearest ten-thousandth.log3.3 166
A. 4.2817 B. 0.2336 C. 2.2201 D. 50.3030