小用火柴棍按下列方式摆图形,第1个图形用了4根火柴棍,第2个图形用了10根火柴棍,第3个图形用了18根火柴棍.依照此规律,若第n个图形用了70根火柴棍,则n的值为( )
A:6
B:7
C:8
D:9
某宾馆9月份营业收入85000元,应缴税款5100元,营业税率是____.
Li Ping is a Grade Eight student in Nanjing Sunshine Secondary School. The table below is his mid-term self-assessment(自我评价).He draws faces to show his progress: