Which sets of side lengths represent Pythagorean triples? 1,2,5,6,8,14,8,15,17,10,24,26,15,20 ,30,28,45,53

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?