18. What is the smallest and what is the largest unit of measures nearest to 6 and one-fourth inches if we are measuring to the nearest sixteenth of an inch?
19. How high is a horse if you are told that he is 7 hands high? Justify your answer.
20. What is the measure of the exterior angle of a triangle if the two interior angles opposite it measure 25 and 45
respectively?
21. Give the name, the abbreviation and the math value for each of the six metric prefixes.