UNIT - 6 OBJECTIVE 4 - LOGARITMS TO THE BASE 10
There are two log keys on your calculator. First is the common log key that is log base 10. When the log is written without the subscript for the base, it means to the base 10. So log 250 means and can be evaluated on your calculator. log 250= 2.3979 and means that Example 1 Find the following common logarithms to the 4 decimal places. a)log 15= 1.1761 b)log 0.567= -.246 c)log 0.0035= -2.4559 On your calculator, you can also "undo" the log function. "Undoing" a log is called "finding the antilog". If you were given log x=2.56, then x=antilog of 2.56. This usually means using 2nd log, inverse log or the key on your calculator. Antilog of 2.56=363.078. Example 2 Find the antilogs to two decimal places. a)antilog of 2.8= 630.96 b)antilog of 1.9=79.43 c)antilog of -2.8= 0.00158 d)antilog of -345= 0.45
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