the imaginary Unit number is a solution to the quadratic equation x^{2}+1=0. basically any number times itself is a positive number or zero so you can't ever get to a negative number by squaring. Since square roots undo squaring, negative numbers can't have square roots.
(24, 12) and (36, 0). The least amount of flowering plants occurs when x=2y, and the largest amount occurs when y=0. These two points satisfy both conditions and both sum to 36.
