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

Expand and simplify: ln(xe)
Thats the problem that has been driving me crazy. I dont uderstand how logarithms work so any help with this is very much appreciated. Thanks so much! driving down a mountain, tom finds that he has descended 1800 ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth.