Solve.How long will it take for the population of a certain country to double if its annual growth rate is 6.4%? Round to the nearest year. Use the exponential growth model P(t) = P0ekt.
A. 5 yr
B. 1 yr
C. 11 yr
D. 31 yr
Answer: C
Mathematics
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How many subsets and proper subsets are in the given set?{1, 3, 5, 7, 9, 11}
A. 63, 62 B. 63, 64 C. 64, 63 D. 62, 63
Mathematics
Find the least common denominator.
, 
A. m(m - 4)2(m - 5) B. m(m + 1)(m - 5) C. m(m - 4)(m - 5) D. (m + 1)2
Mathematics
Find the square root.-
A. 
B. -3
C. -81
D. not a real number
Mathematics
Solve the problem.The linear equation y = 443x + 3420 provides an approximation of the annual cost (in dollars) of health insurance for a family of three, where 
represents 2011, 
represents 2012, and so on. Write an equation that yields the same y-values when the exact year number is entered.
A. y = 443(2011 - x) + 3420 B. y = 443(x - 2010) + 3420 C. y = 443(2010 - x) + 3420 D. y = 443(x - 2011) + 3420
Mathematics