D Question 11 6.25 pts Use the definition of the logarithmic function to find x. log, 81=4 O x = 81 Ox=4 Ox= 3 O none of these Ox=5 D Question 12 6.25 pts Expand the expression using the laws of logarithms. In xox Omx+ olny+ - Ir Inx+ olny - Inz O In x - ly- inz Inx - olny+ 9l O 9 (In x + In y -In z)D Question 13 6.25 pts Find the focus of the parabola. x2 = 5y O (5, 0) O (0, -5) O (-5, 0) D Question 14 6.25 pts Find the third term of the recursively defined sequence. a, = 3(a, -1-3), and a 1 = 5 O a; = 15 O a; = 11 O a3 = 6 O a; = 3 O a; = 9D Question 15 6.25 pts Use a graphing calculator to evaluate the sum. Round to four decimal places. 14 2 72 +9 O S = 0.1693 O S=0.1676 O S= 0.1699 O S=0.1622 O S= 0.1764 D Question 16 6.25 pts Find the 200th term of the sequence. an = 10 O azoo = 210 O azoo = 10 O a200 = 2000 O a200 = 200 O a200 = 1