exam Maths Puzzle Numerical Ability

im having trouble figuring this one out.

[51(t+h)-0.83{(t+h)^2}-(51t-0.83t^2)]/h

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exam Other Question

Graph the linear equality.
31). y ≥ 6x Rise and run. If the rise is 3/2 and the run is 5, then what is the ratio of the rise to the run?