If an Arithmetic Sequence is obtained by adding a constant called common difference, a Geometric Sequence is obtained by multiplying the preceding term by a non-zero constant called________.

If the first term of a Geometric Sequence is -2 and the common ratio is 2, what is the 7th term?

What is the missing term of the sequence

5, 15, 45, _____, 405, . . .?

What is the common ratio of the sequence

In $a_n=\ a_1\cdot\ r^{n-1}$ , find the eighth term of the Geometric Sequence whose first term is 64 and whose ratio is  $-\frac{1}{2}$  . 

In the Geometric Sequence

1, 4, 16, 64, … what term is 16,384?