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Find the rate of change of the function at a given value. 1. f(x) = 2x -3, atx = 5 2. f(x) = 2x2, at x = 4 3. f(x) = -3x3, at x = -3 4. f(x) =3-x, at 1= -3 5. f(x) = 4x3 + x, atx = 3 6. f (x) = 2x3 + 3x + 1, atx = 2 7. f(x) = 5x2 - 2x -4, atx = -1The velocity of moving object at a point during its motion can be determined using derivatives. Given the function of the velocity of an object to be f(x) =-x3 +6x -2. where f is the velocity, and x is the time in seconds. Find the instantaneous velocity of the object at the following instances: a) at the end of 1 second b) at the end of 3 seconds c) at the end of 5 seconds At what time is the object increasing or decreasing its velocity