Find the number of terms in each sequence.

Question

1. 2,-6, 18,-54,,,,,-4374

Find the common ratio r and the value of a1 using the information given. (assume r >0)

2.a3=324, a7=64

Find the indicated sum.

3. a1=2, r=-3; find s8

4. E like symbol with a 10 on top. On the bottom k=1 to the right 2^k