What is the x intercept of the line 3x+4y=12

Given this information, which expression must represent the value of b?

7(x - 2) = 3(x + 4) solve the following equation. then enter your answer in the space provided using mixed number format.

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.