Answer:
2. $2.31
Step-by-step explanation:
25% off, 75% to be paid
75/100 × 31.5 = 23.625
20% off, 80% to be paid
80/100 × 26.75 = 21.4
18% off, 82% to be paid
82/100 × 26 = 21.32
Highest - Lowest
23.625 - 21.32
2.305
Quadratic formula is x=(-b+-sqrt(b^2-4ac))/(2a)
a= 1, b=-4, and c=3
Therefore, x=(-(-4)+-sqrt((-4)^2-4(1)(3))/(2(1))
Solve for both the plus and minus equations; the answers will be the roots to the quadratic equation.