$\"\"$

The sequence is $\"\"$ .

$\"\"$ (1st term)

$\"\"$

$\"\"$ (2nd term)

$\"\"$

$\"\"$ (3rd term)

$\"\"$ $\"\"$

$\"\"$ (4th term)

$\"\"$

$\"\"$ (5th term)

$\"\"$

The first five terms are 97, 94, 91, 88, 85.

$\"\"$ (Apply common difference formula: $\"\"$ )

$\"\"$ (Simplify) $\"\"$

The first five terms are 97, 94, 91, 88, 85 and the

common difference of sequence is $\"\"$ .