Which system of equations has no solutions?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

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?

Ten times the square of a non-zero number is eqaul to ninety times the number