Find the average value fave

chapter 6.5 

1.Find the average value fave of the function f on the given interval.

f(x) = 18x − x2,[0, 4]

2.Find the average value 
h
ave of the function 
h on the given interval.

h(x) = 3 cos4 x sin x,[0, π]

3.Find the numbers b such that the average value of 

f(x) = 3 + 10x − 9x2

 on the interval [0, b] is equal to 4.