To find the common ratio
divide by the previous numb/number beside it:

so
Answer:
negative
Step-by-step explanation:
if you are multiplying with a negative and a positive it will always be negative. if you are multiplying with 2 positives or 2 negatives it will be positive. 2 negatives equalling a positive.
25% because 21 is a quarter of 84. And 21 times 4= 84, so 21 is 25% of 84.