Which set of numbers could be the lengths of the sides of a right triangle ? 2,6, and the square root of 40 . 4,6 and the square root of 40 2,18,20 4,36,40

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad