How do you use properties of Logarithms to rewrite the following as the logarithm of a single number #log 7 + log 3#? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Ernest Z. Jul 5, 2015 #log7 + log3 = log21# Explanation: Property: #log(xy) = logx +logy# or #logx +logy = log(xy) # So #log7 + log3 = log(7×3)# #log7 + log3 = log21# 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 1753 views around the world You can reuse this answer Creative Commons License