MATH HELP ME ASAP PLSSS

-5

an=4-5n

a12=-56

Step-by-step 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

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explanation: