1.7793594306 rounded to the nearest hundreadth

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Im literally having a mental breakdown

An account with a $250 balance accrues 2% annually. if no deposits or withdrawals are made, which graph can be used to determine approximately how many years will it take for the balance to be $282? it's e2020 ni️️as