exam Maths Puzzle Numerical Ability

let h(x)=4^x+1 and find h(-1)

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I also need help with theese three if you dont mind me asking for it.

4(3 − 2) = 4(3) − 4(2)

9 + 8 = 8 + 9

4 + (2 + 6) = (4 + 2) + 6 I think that I have to see if x1 and x has a solution and x2 and x have a solution and if they do the x is an element of span(x1,x2)