I’m struggling on math (proportional relationships) and i need (on both questions) there are 2 options to pick (30 ! )

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

Which expressions equal 9 when x=4 and y=1/3 a. x2+6y b. 2x + 3y c. y2-21x d. 5 (x/2) -3y e. 3x-9y