What is the explicit rule for the sequence?

15.5, 13, 10.5, 8, 5.5, 3, ...

an=18+2.5n
an=15.5+2.5n
an=18−2.5n
an=15.5−2.5n

❤️ (geometry) does the construction demonstrate how to copy an angle correctly using technology a) yes; the distance between points a and f was used to create circle h b) yes; the distance between points f and g was used to create circle h c)no; the distance between points a and f was used to create circle h d) no; the distance between points f and g was used to create circle h