exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (-6,-7) and (-6,-1)

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exam Other Question

Solve the following quadratic equation. x^2-9x-10 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!