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how do i evaluate/solve multi-step expressions?

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.

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.