Solving functions?

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Knowing f(x)=x^2+x and g(x)=2x+1 how would you solve f(g(x)) and (g (circle) f)(4)?? How do you determine the f^(-1) of f(x)=3x-2? Is x+2/3 correct? Thanks

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If f(x)= the square root of x, g(x)= 6x-3, and h(x)= x/3 what does f(g(h(6))) equal? And how do you do this?

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How do you solve a function if it is something like this: Suppose f(x)= (-9)x + 2 and g(x)= (-3)x + 3. Find each value. Then trying to solve for something like this: 1.) 3g(4) 2.) g(-2)/f(3) How do you suppose I should solve these?

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If f(x)=3x^2+8 and g(x)=4x+21, then what is (f times g)(-5)? The answer is 11, but I do not know how to work it out.

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What is the value of g(f(3))?

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