What is the average rate of change for this quadratic function for the interval from x=3 to x=4

ANSWER

A. 27.5

EXPLANATION

The average rate of change of the given quadratic function on the interval;

x=2 to x=4 is the slope of the secant line connecting the points (2,f(2)) and (4,f(4)).

This implies that the average rate of change is

From the table,

and

f(2)=9.

The average rate of change becomes

The correct choice is A.

the answer is b.)

< 1=< 2