50% of a number is x. What is 100% of the number? Assume x>0

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?