A bag contained 5 red, 8 blue, and 7 white marbles. Jose drew two marbles from the bag one at a time, without replacement. What is the probability that jose chose two blue marbles

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?