What are the factors of x2 – x – 6? Check all that apply.

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

What is the value of x when x + 7 = 21?

Which of the following best describes the figure?