How to do the following problem w/ explanation

The highest common factor of 132 and 220

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.