## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$a_1=\frac{3}{2}$ $d=\frac{3}{4}$
In an arithmetic sequence, the common difference can be calculated as the difference of any two subsequent terms: $d=a_2-a_1=\frac{9}{4}-\frac{3}{2}=\frac{3}{4}$ The first term is: $a_1=\frac{3}{2}$.