Help needed URGENT
look a t question

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Math it's appreciated. (picture provided)

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.