Write an inequality to describe the possible values of x

What is the value of the expression below? (81^2)^1/8

Why is causation so much more difficult to prove than correlation?

Einstein office equipment has a rental plan for office machines. a fax machine that lists for $722.98 can be rented for 22% of the price annually. the state imposes a usage charge of 3.2%. if stephen hawking travel decides to rent the fax machine, what will its total monthly rental charge be?