Piz help me out with this one

asked Oct 5, 2018 92.1k views

4 votes

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3 votes

hello :
the formula is : an = a1+(n-1)d a1 : the first term d : is the common diff
an = 9+(n-1)(-2)
an =9-2n+2
an = -2n +[ 11 ]

Brian Beech answered Oct 7, 2018

7.8k points

4 votes

Answer: -2n+9

This is because the starting value is 9, so it has to be included in the equation.

Haruka answered Oct 10, 2018

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