—All right. I____ him later.
A:will call
B:have called
C:call
D:will be calling
广告费用X (万元)
1
2
3
4
5
6
7
销售额y (百万元)
2.9
3.3
3.6
4.4
4.8
5.2
5.9
根据表可得回归方程y=bx+a中的a为2.3,根据此模型预报广告费用为12万元时销售额为____万元.
(Ⅰ)求函数f(x)的单调递增区间;
(Ⅱ)在△ABC中,内角A、B、C的对边分别为a、b、c.已知 f(A)=32 ,a=2, B=π3 ,求△ABC的面积.
What's the relationship(关系) between the two speakers?