Let r = (5,-1), s = (6, 0), and t = (-1, -3). Aaron incorrectly determined 2r4s-7tas (41,-23). Review his calculations.

2r4s-7t
2(5,-1)+4(6,0-7(-1,-3)
(10,-2)+(24,0)+(7, -21)
(41,-23)

What mistake did Aaron make?

O He added (10,-2)+(24,0)+(7,-21) incorrectly.
O He should have subtracted (7, -21) rather than add.
O He did not correctly distribute 4 to both components of s.
O He did not correctly distribute the negative when subtracting 7t