Im really confused on this question, and i need to submit this by can someone me and tell me how you answered this

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

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?