Step-by-step explanation:
6x - 3x^2 + 2x^2 -2x = 5x^2 + 15x
4x -x^2 = 5x^2 + 15x
-11x - 6x^2 = 0
-6x^2 - 11x = 0
use the quadratic formula
(-b±√(b²-4ac))/(2a)
12: 1.8= 20/3. => the answer is 20/3 miles
400x=22,000
22,000/400=x
55=x Hopefully this is right, and hopefully this helps