Question

Помогите пожайлуста решить задачи:

Answer 1

$\displaystyle\bf\\1) \ \ b_{1} =3 \ \ \ ; \ \ b_{2} =1,5\\\\b_{2} =b_{1} \cdot q\\\\q=b_{2} :b_{1} =3:1,5=2\\\\b_{4}=b_{1} \cdot q^{3} =3\cdot 2^{3} =3\cdot8=24\\\\Otvet:b_{4} =24\\\\\\2) \ \ 5 \ ; 6 \ ; \ 7 \ ; \ 8 \ ; 9 \ ...\\\\y_{n} =n+4$