Find the average value of the function f(x)= 2/(x-8) from x=1 to x=7. Express your answer as a constant times ln7.

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30