Solve the simultaneous equations: and

The hypotenuse of an isosceles right triangle is $14\sqrt 2$. what is the area of the triangle?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?