Answer:
2
Step-by-step explanation:
Average rate of change of a function between x=a and x=b is:
[ f(b) − f(a) ] / (b − a)
On the interval 3 ≤ x ≤ 5:
[ f(5) − f(3) ] / (5 − 3)
[ (5²/4 − 5) − (3²/4 − 5) ] / (5 − 3)
(25/4 − 5 − 9/4 + 5) / (5 − 3)
(25/4 − 9/4) / (5 − 3)
(16/4) / 2
2
