Question

find the third, fifth, and eleventh terms of sequence described by the rule
A(n)=-4+(n-1)(4)
A(3)=?

Answer 1

they already gave you the equation
all you need to do is replace n with number of terms
in that equation n= number of terms you need
so for example to find 8th term you should replace n with 8

Answer 2

\[\rm a_n=a_1+(n-1)d\] equation for arithmetic sequence
where a_1=first term
d= common difference
n= number of terms u r looking for