Please explain to me.

25-32. Average values Find the average value of the following functions on the given interval. Draw a graph of the function and indicate the average value.

35. Average velocity The velocity in mfs of an object moving along a line over the time interval [0, 6] is 11(t) = t2 + 3t. Find the average velocity of the object over this time interval. o a 5?. Symmetry of powers Fill in the following table with either even or odd, and prove each result. Assume n is a nonnegative integer and in means the nth power of f. fis even fis odd n is even f\" is f" is n is odd f\" is f" is