Someone hurry (show work pls -5)=4(5x+3) (a)-2 (b)-1/2 (c)1/2 (d)2

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

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.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a