What are the coordinates for the vertex of the graph of y= Ix+2I +3

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

What multiplys to be 1 but adds up to be 4

What are the greatest common factor of 75 and 30