Find the average rate of change for f(x) = 7x + 12 on [2,8]
问题描述：
Find the average rate of change for f(x) = 7x + 12 on [2,8]
答
f(x) = 7x + 12 on [2,8]
=[f(8)-f(2)]/(8-2)
=(56+12-14-12)/6
=7