The ratio of the number of male lions to female lions is 21: 20; if there are 123 lions, how many lions are female?

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Jim had 15 minutes to do 5 laps around his school what would his time be

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?