Find X . Someone please help

Need ! easy 6th grade work! i will put as much points as i can! you so much! i’m learning this in math and it’s soo

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.

Which of the following is the shape of a cross section of the figure shown below