Can someone answer it multiple questions only 5 due in 10 mins

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.

Why is x= 4 a solution to the proportion 14/x 56/1 6

Find the values of the variables and the lengths of the sides of this kite.