Question 605215
True or False: 
a. A natural logarithm is a logarithm in which the base is 10 
false, natural logs use base e=2.718..
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b. If 2 log3 (81) = 8, then log3 (6,561) = 8 
true. 2 log3 (81)=2*4=8, 3^8=6561
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c. log(N)is negative when N > 1
false, log(N) is positive when N>1
log(N)is negative when 0< N < 1
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d. If 2 log3 (81) = 8, then log3 (81)=4
true, 2 log3 (81)=2*4=8, 3^4=81