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8. Find the average rate of change for the function below from 1 to 4. 3 f (x) = x+2 OA OB -2 OC -28 OD9. Graph the function and specify the domain. y = 5-* + 2 OA -4 -2 1-2.9 1-5 4-7.5 -10 domain: (5, 00) OB $7.5 domain: ( -00, 00) OC $7.5 $2.5 -4 -2 domain: ( -2, 5) OD $7.5 $25_ _ -4 -2. domain: ( -5, co)10. Use the following graph of the function f' to estimate the intervals on which the function f is increasing and decreasing. y = f '( x ) 2 The function is on (-co,-2] and [2, co) . (increasing, decreasing, constant)