Help please i will thank you a lot.

Pls! does anybody know a shortcut for answering these types of questions in the future?

Find the solutions for a triangle with a =16, c =12, and b = 63º

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.