How do you evaluate #log_15 1250# using the change of base formula? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Douglas K. Apr 13, 2017 #log_15(1250) = log_10(1250)/log_10(15) = ln(1250)/ln(15) ~~ 2.633# Answer link Related questions What is the common logarithm of 10? How do I find the common logarithm of a number? What is a common logarithm or common log? What are common mistakes students make with common log? How do I find the common logarithm of 589,000? How do I find the number whose common logarithm is 2.6025? What is the common logarithm of 54.29? What is the value of the common logarithm log 10,000? What is #log_10 10#? How do I work in #log_10# in Excel? See all questions in Common Logs Impact of this question 1580 views around the world You can reuse this answer Creative Commons License