exam Maths Puzzle Numerical Ability

I had a question similar to this one earlier. This one is of a different format though. If Given A5= -5 and A9=10 find d and A1

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exam Other Question

A small flare is launched off the deck of a ship. The height of the flare above the water is given by h(t)=-4.9t^2+92t+9, where h(t) is measured in metres and t is time in seconds. For the following set, which number has the largest absolute value?

4, -1, 12, -20, 19, 0

Can you show me how to figure the answer.