log 7 to the base 10=0.845find log 490 to the base 10
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log 7 = 0.845
log 490 = log (49×10) = log 49 + log 10
= log 7² + 1
= 2 log7 +1
= 2 × 0.845 +1 = 1.69+1 = 2.69
log 490 = log (49×10) = log 49 + log 10
= log 7² + 1
= 2 log7 +1
= 2 × 0.845 +1 = 1.69+1 = 2.69
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