What is the greatest common factor of this numerator and denominator of this rational expression: 4x-8/x^2+4x-12

A.14
B.4x
C.- 2
D.4x - 4

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?