Question

What is the 43rd term of an arithmetic sequence with a rate of increase of -6 and a11 = 12?

Answer 1

Let a be the first term.
\[a _{n}=a+\left( n-1 \right)d\]
n=11
d=-6
\[a _{11}=12\]
find a ,then \[find~ a _{43}~by~formula.\]