At least 15 b/c is you add QWERTY to -12, you get zero and adding 5 to get 15 in total.
48 fluid ounce it is $0.40 per fl oz, while the other one is $0.60 per fl oz
5(x^2 - 14x + 258/5)
= 5((x-7)^2 -49+258/5)
= 5((x-7)^2 + 13/5)
= 5(x-7)^2 + 13
I belive this is how it should be done
