Can some one please write the answers on the pdf

For what values of b will f(x)= logbx be a decreasing function? (16 )

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible