What is 3,190,000 in scientific notaion?

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

Me asap! what is the slope of this line? enter your answer in the box.

Plz hurry evaluate the expression a+b where a=8 and b=19