Which line is parallel to line r? line p line q line s line t

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

Can someone me out here number 4 plz

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?