What is a dependent variable, and what is an independent variable? I forgot.

Ineed with number 17 i don’t get it at alll

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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.