A person accidentally dropped a quarter, a dime, and a penny. All three coins landed on heads. What was the probability of this happening? (consider creating a tree diagram)

Can someone me out here number 4 plz

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?

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?