10 + 2a = - 18 please give an explanation as that's all I'm really looking for :)

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

The sum of two numbers is 86, and their difference is 20. find the two numbers

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?