Cyril is addressing 200 invitation to a reunion. He completes 20% of the invitations on Wednesday and 40% of the invitation on Thursday. Cyril says he has addressed it 60 invitation. Why is Cyril's statement not reasonable?

Which statements about these triangles is true

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?

X+y=-4 x-y=2 use elimination with adding and subtraction