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Relations and Functions | Inverse of a Function

For all x such that x > 0, f(x) = log8 x. What does f-1(x) equal?
Let, f: R→R: f(x) = x2 - 17. What is the pre-image of -1  
Which of the following statements is/are true:  If f is a bijective function then f is invertible If f: A → B and g: B → C are invertible functions then g o f is also invertible function. (g o f)-1 = f-1 o g-1 
Consider the following functions: 1. f(x) = x3, x ϵ R 2. f(x) = sin x, 0 < x < 2π 3. f(x) = ex, x ϵ R Which of the above functions have inverse defined on their ranges?
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