exam Maths Puzzle Numerical Ability

PLEASE TRY AND SOLVE THESE QUESTIONS WITH THE INFO GIVEN HERE, i AM COMPLETELY LOST, I WOULDN'T KNOW WHERE TO START, AND SOMETIMES I THINK I AM MADE TO FAIL AT MATH, BECAUSE I ALWA

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exam Other Question
Find the equation of the line that:

passes through (1,2) with slope 0 Evaluate the function of the indicated values
f(x) =4[[x-6]]-9
(i) f(4) (ii) f(2.9) (iii) f(9/8)
I can't figure this one out. Thanks!