Two students take measurements as shown to determine the width of the river. Find the width of the river S
12 m
3.8m

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-5)1/2+5=2 what is possible solution of this equation

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?