exam Maths Puzzle Numerical Ability

Please help me on this,
Recall: the height in feet after t secs is h(t)=-16t^2+vt+s
A Ball is dropped(so the initial velocity is zero) and it takes 5 seconds to hit the ground. I

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Please help me to understand how to do this...it doesn`t make sense to me. Thank you so very much in advance for helping me. Here is the problem:


3^w * 3^5-w * 3


Thank Find the length, to the nearest tenth, of the apothem of a regular octogon whose sides are each 10 inches long????