Can someone explain this math problem to me so I can show my son how to solve it please

Franco wants to double the volume of the cone. what should he do?

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.

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30