The answer is 5 you can also use your fingers no I’m not calling you dumb I’m just saying you can
(f o f^-1) x = x
therefore (f o f^-1) 4 = 4
Its A
840,000 because 36 is the # in the 10 thousandth place so you just have to round. You get 40. Now you have to combine the 100 thousandth and the 0 thousandth place together and boom, you get your answer.
