Question

Помогите пожалуйста за 40 баллов

Answer 1

$q = \frac{-20}{-4}$ = 5

$b_3=-20*5=-100$

Answer 2

$\displaystyle\bf\\b_{1} =-4\\\\b_{2}=-20\\\\b_{2} =b_{1} \cdot q\\\\q=b_{2} :b_{1} =-20:(-4)=5\\\\b_{3} =b_{2}\cdogt q=-20\cdot 5=-100\\\\Otvet:b_{3} =-100$