Solve the problem.A certain country's population P(t), in millions, t years after 1980 can be approximated by P(t) = 4.495(1.018)t .Find the doubling time.
A. 38.9 yr
B. 61.6 yr
C. 77.7 yr
D. 84.2 yr
Answer: A
Mathematics
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Write the phrase as a variable expression. Use x to represent "a number."9 less than 7 times a number
A. 9x - 7 B. 7 - 9x C. 9 - 7x D. 7x - 9
Mathematics
Factor completely. If the polynomial cannot be factored, say it is prime.(x + 9)2 - 64
A. (x + 73)(x - 55) B. x2 + 18x + 17 C. (x + 17)(x + 1) D. (x - 1)(x - 17)
Mathematics
Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms.log7 
A. log7 19 - log7 s - log7 r
B. 2 log7 19 - 2 log7 s - log7 2
C. 
log7 19 - 2 log7 s - log7 r
D. 
log7 19 - 2 log7 s - 2 log7 r
Mathematics
Simplify.
A. 
B. 
C. 4x - 1
D. 
Mathematics