Sad it's bought 2/5 meter of ribbon and Lolita 3/4 meter of ribbon what is the total length of the ribbon they bought

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.

Ill mark the brainliest if you me with the these three questions 7,8,9

What would the rule be for the reflection of y=-3