4. In how many ways can the 4 call letters of a radio station be arranged if the first letter must be W or K
and no letters repeat?

Geometry answer picture question pls . reason and statements

What is the value of x in the diagram below?

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.