Which expression represents the number of possible permutations of n items taken r at a time?

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

Which of the following is an example of conditional probability

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i