13. [0/6.66 Points] DETAILS PREVIOUS ANSWERS LARPCALC10 3.3.009. Evaluate the logarithm using the change-of-base formula. Round your result to three decimal places. log3(19) X Need Help? Read It Submit Answer 14. [0/6.66 Points] DETAILS PREVIOUS ANSWERS LARPCALC10 3.3.053. Use the properties of logarithms to expand the expression as a sum, difference, and/or constant multiple of logarithms. (Assume the variable is positive.) log2 a2-9 a > 3 3 Need Help? Submit Answer 7 Road It 15. [-/6.76 Points] DETAILS LARPCALC10 3.3.055. Use the properties of logarithms to expand the expression as a sum, difference, and/or constant multiple of logarithms. (Assume all variables are positive.) log4 x yz Need Help? Submit Answer Read It