Solve the problem.A certain radioactive isotope has a half-life of approximately 1600 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 80% of that amount?
A. 515 years
B. 435 years
C. 320 years
D. 3715 years
Answer: A
Mathematics
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Find the coordinates of the centroid of the given figure. Each region is covered by a thin, flat plate.The region bounded by the parabola x = y2 and the line x = 9
A. (9, 0)
B. 
C. 
D. 
Mathematics
Find the equation of the tangent line to the curve when x has the given value.f(x) = x2 + 11x - 15 ; x = 1
A. y = 13x - 16
B. y = - 
+ 
C. y = -39x - 80
D. y = 
+ 
Mathematics
Insert <, >, or = between the pair of numbers to form a true statement.0.5 _____ 0.084
A. < B. > C. =
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Divide.- 
÷ 
A. - 
B. 2
C. 
D. -2
Mathematics