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

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?