Question

Срочно 50 баллов !!!!

Answer 1

Ответ: 1)

$an=-25.05\an= a1+d(n-1)\-25.05=1.35-2.4n+2.4\2.4n=28.8\n = 12$

2)

$left { {{a1+2d=-3} atop {a1+8d=-69}} right. -\\-6d=66\d=-11$