Train B travels 140 miles which is 40% of the total distance it will travel. What is the total number of miles train B will travel?

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

Can someone me out here and the tell me the greatest common factor

What is the inverse of the function f(x) = 2x + 1?