题干
The hostess had the____(请柬) delivered a week before the party.
答案(点此获取答案解析）
invitations
The hostess had the____(请柬) delivered a week before the party.
的值是(1,2),(2,3),(3,4),(4,5)，则
与
之间的回归直线的方程是
中，若
，则