Respuesta :

Pokefan

Answer:

-2.5

Step-by-step explanation:

-1/2 is the number it is being miltiplied by

teeaghaan78191
answer would be -2.5



because:
20 times -.5 is -10
-10 times -.5 is 5
5 times -.5 is -2.5

the reason for this geometric sequence, is each number being multiplied by -.5