HELP! Whats the area of this triangle? also provide explanation??

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

What is the simplified form of square root of 400 to the 100th power ?

Ken leaves work 20 minutes late. he decides to make up time by taking the toll road instead of side streets. he can travel three times faster by taking the toll road. create an equation to represent his total travel time, including wait time, where x is the number of minutes the drive was expected to take