Pls help me i’m confused

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

Which of the following expressions is equal to 2x^2+8

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.