Question

Kylie starts with $145 in her piggy bank. Each month she adds $20.

Answer 1

Kylie's first month collection, a1= $ 145

Second month collection , a2= $145+ 20

Third month collection, a3  = $145 +2*20

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so for n months collection = an-1+20

We get an= 20 + an-1  and a1=145