— Betty, what's up?
—Tommy promised to have dinner with me, but he haven't come along.
A:appeared
B:accepted
C:stayed
地理信息系统( )。
某宾馆重新装修后,准备在大厅的主楼梯上铺设某种红地毯,已知这种地毯售价为30元/m2,主楼梯宽2m,其侧面如图所示.
(1)求这个地毯的长是多少?
(2)求这个地毯的面积是多少平方米?
(3)求购买地毯至少需要多少元钱?