I only have till Friday to do 200 mini quizzes that have 7 questions in each one

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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? enter your answer in the box. photo attached.