Question

an=-22
a1=44
d=-6
n=?

Answer 1

an = a1 + d*(n - 1)

-22 = 44 + (-6) * (n - 1)

6 * (n - 1) = 44 + 22

6 * (n - 1) = 66

n - 1 = 11

n = 12

Answer 2

Ответ:

$n=12$

Объяснение:

$a_n=a_1+d\cdot(n - 1)\\-22=44+(-6)\cdot(n - 1)\\-22-44=(-6)\cdot(n - 1)\\-66=(-6)\cdot(n - 1)\\66=6\cdot(n-1)\\\frac{66}{6}=n-1\\11=n-1\\11+1=n\\n=12$