Question

please answer immediately I will mark u as brainlist​

Answer 1

Answer:

y+63

Step-by-step explanation:

$d=y-2-(y-7)\\=y-2-y+7\\=5$

$a_n=a+(n-1)d$

$a_{15}=y-7+(15-1)5\\=y-7+14\times5\\=y-7+70\\=y+63$