Which interval could contain a solution to f(x)=0

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

Is it true or false i’m trying to pass this test so i can leave school

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)