(100 POINTS!) (URGENT!!!) 
 The table above gives values of a twice-differentiable function and its first derivative for selected
 values of . Let be the function defined by .
 
 (a) What is the value of ?
 ease respond on separate paper, following directions from your teacher.
 
 (b) It is known that . What is the value of ?
 
 (c) Is there a value , for , such that ? Justify your answer.
 
 (d) Let be the function with first derivative given by . At what value of in the
 interval does the instantaneous rate of change of equal the average rate of change of
 over the interval ?