Respuesta :

hmoovp2qew1
Since they're both already in terms of y, you can just set them equal to each other.

4x = 1/2x + 280
3.5x = 280
x = 80

So 80 would be the amount he needs to sell to make the cost and revenue equal each other.
123Godlover
I am not sure try b maybe I don't know