Also need with this on i especially don’t get this one

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

What could explain what happened when the time was equal to 120 minutes

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.