book Maths Puzzle Numerical Ability

Find the nth term formula for the geometric sequence whose first term is 18 and whose second term is 9.

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square root x-2-8=0 using graphing utlity to slove this problem I hope someone is here is that good to solve this thank you so much How many different ways can 13 different runners finish first, second and third place in a race? How can you solve this equation when in class we are working on permutaions and combinations as well as probabitly.