Question

given {27,15,3,-9,...} find a11

Answer 1

Answer: -21, -33, -45

Step-by-step explanation:

each next number is being subtracted by 12 so

Answer 2

Answer:

-91

Step-by-step explanation:

a1=27

d=15-27=-12

an=27+(n-1)(-12)=27-12n+12=39-12 n

a11=39-12(11)=39-132=-91