exam Maths Puzzle Numerical Ability

Please help me solve the equation, f(x) = 2x-5 divided by x+4, find f-1(x). This is a problem which the teacher created from this section of the book. Thank you for your help and assistance. Gary

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exam Other Question
You have a 10 cm cube and you cut the cube into 1 cm pieces, what is the largest cube you can build that looks solid from the outside but is hollow on the inside, and how many pieces would be left over?
 Find each value if f(x)=7x+2 and g(x)=4x-x/2.

1. f(-7) 2. g(8) 3. f(8/14) 4. g(-6n)


Please help me find the answers. I dont understand.