It takes them two hours ______ football every day.
A:play
B:playing
C:to play
D:plays
(Ⅰ)若函数f(x)在(1,f(1))处的切线方程为3x+3y﹣4=0,求m的值;
(Ⅱ)求函数f(x)的单调递增区间.