Point B is between A and C. AC = 42, BC = x + 12, and AB = x +6.
Find the value of x.

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

Which of the following expressions is equal to 2x^2+8

Select the quadratic that has root x = 8 and x = -5