Answer: <em>-1</em>
Step-by-step explanation:

-2
8(17-12)/ -2(8+2).
A negative and a negative equals a plus
8(5) / -2(10)
40 / -20
= -2
128 flowers 1/5 are pink
128/1 * 1/5 = 128/5 or 25.6 flowers are pink. I would say 25 because you can't have .6 of a flower.
Minus mean to subtract. With the symbol (-)
Therefore, the best algebraic expression should be y-12