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Module 25 Natural and common logarithms. Also use of change of base formula.

Using your calculator for the next 5 slides solve the following basic problems. Round to nearest 4th decimal if necessary. log5 .6991
log10 1
log24 1.3802
ln5 1.6094
ln10 2.3026
Change of Base formula. If a, b, and C are positive real numbers and neither b nor c is 1. Then, LOG b of a = Log c of a/log c of b
Examples: Log(base4) of 9= Log(base)10 of 9 / log(base)10 of 4 =1.5851
Log(base)20 of 15 log(base)10 of 15/ log(base)10 of 20 =.9040
Created by: amarowsky1