The answer are no solution, one solution or infinitely many solutions

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

anyone? find the second, fifth, and ninth terms of a sequence where the first term is 65 and the common difference is -7. 72, 93, 121 72, 79, 86 58, 37, 9 58, 51, 44

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle