exam Maths Puzzle Numerical Ability

For what numbers x is f(x) = 0?
the graph is: its starts from -1 on the y-axis and cuts over 1 on the x-axis and ends at points (6,1.5)
pls i need this answer urgently
thanks in advance

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exam Other Question

each interior angle of a regular polygon measures 140. how many sides does the polygon have? explain your answer Find the first five outputs of the following recursively defined function:

f(1)=8,(thats given) f(n+1)=-f(n)+6

its not really a permutation but i didnt know what category to put it in