Answer:
You can buy 8.18 gallons of milk.
Step-by-step explanation:
12.79/4.89 = 2.62
21.44/2.62 = 8.18
steps
(x) = 5x^2-3x+7
refine
x=5x^2-3x+7
Switch sides
5x^2-3x+7-x=x-x
Subtract x from both sides
5x^2-4x+7=0
Solve with the quadratic formula
2x2x3x3
so 2² x 3²
this is the answer