Ive been stuck for like 20 minutes me

Find the sum of the following series. round to the nearest hundredth if necessary.

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.

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys