Which postulate can be used to that the following triangles are congruent

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Given abcd ac=38 and ae=3x+4 find the value of x

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?