11. Find the following using a calculator. Round to four decimal places. (5 points) log 0.55 O -0.5978 O -0.2596 O -0.0978 O -0.7596 12. Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms. (5 points) log, 7x log2 7 +1092 X O log2 7-1092 X O log, 7 -10g, x O log, 7 + log, x 13. Assuming all variables are positive, use properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms. (5 points) log3 4log, X - 8log, y -log, 2 410g3 x + 8log, y -log, 2 O 4log, x + 8log, y + log, 2 O (410g3 x)(8log, y) -log, 214. Use the product, quotient, and power rules of logarithms to rewrite the expression as a single logarithm. Assume that all variables represent positive real numbers. (5 points) log, 11-1092 z 1092 7 O 109. (7 O 1092 (11-z) O 1092 ( 71) 15. Use the product, quotient, and power rules of logarithms to rewrite the expression as a single logarithm. Assume that all variables represent positive real numbers. (5 points) 5log x + 4log y log ( x 5y4) O log(5x + 4y) O log ( * 5 + 14 ) O log(20xy) 16. Use the change of base rule to find the logarithm to four decimal places. (5 points) logg42.45 1.6279 4.7167 0.5862 1.7059