You visit the Grand Canyon and drop a quarter off the edge of a cliff. The quarter falls 16 feet the first second, 48 feet the next second, 80 feet the third second, and so on. If the quarter fell 9 seconds before hitting the ground, how far down is it?

You visit the Grand Canyon and drop a quarter off the edge of a cliff. The quarter falls 16 feet the first second, 48 feet the next second, 80 feet the third second, and so on. If the quarter fell 9 seconds before hitting the ground, how far down is it?
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1 Answer

Answer :

an=a1+(n-1)dan=16+(6-1)32=176The 6th term is 176. Now we are ready to find the sum:
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