Question

MATH HELP ME ASAP PLSSS

Answer 1

-5

an=4-5n

a12=-56

Explanation:

a1=-1,an=a1+d(n-1)

a2=a1+d(2-1)=-1+d=-6

so -1+d=-6

+1 +1

d=-6+1

d=-5

an=a1+d*(n-1) now I substitute a1 and d because I know them

an=-1+-5*(n-1)=-1-5n+5

an=4-5n

a12=a1+d*(12-1)

a12= -1 -5*11=-1-55

a12=-56