exam Maths Puzzle Numerical Ability

hi, i am needing help with this question from a hand out..

f:R to R is defined by f(x)=2x+1 then f^-1=


i came up with 2x-1 as my answer..can you help verify? thanks

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exam Other Question
Write as an algebraic expression: two plus the product of 5 and m .
If you could tell me the answer and explain it. I would appreciate it. Thanks Several values of the two functions f and g are listed in the following tables
x 4 5 6 7
f(x) 7 6 5 4


x 4 5 6 7
g(x) 6 7 4 5

find (f*g) (6