exam Maths Puzzle Numerical Ability

if f(x)=3x and g(x)=x-2 then f(x)+g(x)=? thank you

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For the following set of data, test the hypothesis that the average is 10. Run a test of that hypothesis and present the conclusion.
x
8.9
9.7
10.3
8.5
10.4
9.3
9.8
7.1
10.6
11.1 solve the equation x^2=-81