please solve for 1 to 3

1. [-/2.5 Points] DETAILS HARMATHAP12 9.3.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER For the function A(x) given in the table, find the average rate of change over each specified interval. 2.5 3 3.8 5 R(x) 21 18 15 12 17 14 26 [2, 5] [3.8, 4] Need Help? Read It 2. [-/2.5 Points] DETAILS HARMATHAP12 9.3.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Given f(x) = x? + 5x + 7, find the average rate of change of f(x) over each of the following pairs of intervals. (=) [1.9, 2] and [1.99, 2] average rate of change over [1.9, 2] average rate of change over [1.99, 2] (b) [2, 2.1] and [2, 2.01] average rate of change over [2, 2.1] average rate of change over [2, 2.01] (c) What do the calculations in parts (:) and (b) suggest the instantaneous rate of change of f(x) at x = 2 might be? Need Help? Read It 3. [-/2.5 Points] DETAILS HARMATHAP12 9.3.040.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER If an object is thrown upward at 128 feet per second from a height of 52 feet, its height S after & seconds is given by the following equation. 5(t) = 52 + 128t - 16t (=) What is the average velocity (in ft/sec) in the first 4 seconds after it is thrown? |ft/sec (b) What is the average velocity (in ft/sec) in the next 4 seconds? ft/sec