PLZ SOME ONE HELP WITH THISS

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

100 points, hi, i’m not sure how to get the equation from the graph and table.

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.