Question

Find the common ratio of the geometric sequence 18,-90,450,...

Answer 1

Answer:

-5

Step-by-step explanation:

The common ratio is what you have to multiply one term by to get the next term.

so:

$18 \times r = -90\\-90 \times r = 450$

where r is the common ratio

We can solve these equations:

-90 / 18 = -5

450/-90 = -5

therefore the common ratio is -5

Answer 2

Answer:

try looking it up on socratic