What is the value of the expression? 2/3+1/6

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.