M3 L5 (Monday 1/4) Exponential Growth

Exponential growth patterns involve (addition or multiplication) to get the next output in the sequence.

exponential formulas are...                                                                                                   arithmetic or geometric ?

Use this explicit formula to find the nth term for a geometric sequence: $a_n=a_1\cdot r^{n-1}$   $where\ a_1=1st\ term\ \left(initial\ value\right)$   $and\ r=common\ ratio\ \left(pattern\ of\ multiplication\right)$  

Use this recursive formula to find the nth term using the previous term for a geometric sequence:   $a_n=r\cdot a_{n-1}$   $where\ a_{n-1}\ is\ the\ term\ before\ a_n$