Question

1) Which of the following relations are functions? If it is a function determine its domain and range. a i) {(2, 1), (4, 2), (6, 3), (8, 4), (10, 5), (12, 6), (14,7)}
ii) {(0, 0), (1, 1), (1, -1), (4, 2), (4, -2), (9,3), (9, -3), (16,4), (16, -4)} iii) {(1, 1), (3, 1), (5,2)} ​

Answer 1

Answer:

Let y be the weight of the new boy. Since the first boy has weight 20 kg, now the total weight