condense each expression single logarithm 4 ln x 16 ln y 5 ln x 5ln y 3 ln x

condense each expression to a single logarithm 4 ln x + 16 ln y 5 ln x – 5ln y 3 ln x – 2 ln y Solve each equation: ln x – ln (x-5) = 4 log 9 – log – 4x = log 21