(6x3la puterea2)impartit la 9 egal

(40 points) what is the recursive rule for the sequence? −7.4, −21.2, −35, −48.8, −62.6,  an=an−1−13.8 , where a1=−7.4 an=an+1+13.8 , where a1=−7.4 an=an+1−13.8 , where a1=−7.4 an=an−1+13.8 , where a1=−7.4