exam Maths Puzzle Numerical Ability

the problem i that I need help is the following:
-2 7/10 / (-1 1/14)

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exam Other Question

I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4 Write the equation of the line passing through (4, 4) and (4, 2).

thanks for the help