- 5 3/4 - 3 1/2 = ? Some one help ty!

Which of the following is the result of expanding the series

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?

Lowest fraction using common term 28/35