Arithmetic sequences

Lessons

1. Arithmetic sequence formula
   Consider the arithmetic sequence: 5, 9, 13, 17, … .
   1. Identify the common difference.
   2. Determine the seventh term of the sequence.
   3. Which term in the sequence has a value of 85?
2. Determine $t_1,d,t_n$ for the sequences in which two terms are given
   1. $t_4=14$, $t_{10}=32$
   2. $t_3=-14$, $t_{12}=-59$
3. Three consecutive terms of an arithmetic sequence are written in the form:
   $1+2x,7x,3+4x$
   Solve for the value of x.