What comes in groups of 1?

Explain why published values for normal range differ and why these values must be continually checked and updated? Do you say seven and five are twelve or seven and five is twelve? What is the area or a rectangle 9 meters long and 8 meters wide? What is 19 as a fraction or mixed number? Who did magic squares originate from? Is it possible to draw a triangle with an acute angle and an obtuse angle? Can there be a positive acceleration and a negative acceleration? Is 6000 minutes 10 hours? How many times is a kilo than a deca? What is the surface area of a cylinder with a radius of 6.3 and a height of 3.7? How many gallons of fuel are in your home propane tank if the gauge shows you have 84 percent? When you multiply a negative by a negative is the number negative or positive? What is 0.18 rounded to the nearest thousandths? If someone is 82 in what year were they born? Cbromosomes that are similar in size shape and genetic content are called what? What is the largest number one could fit in the universe? What percent of women are real blonde? Signs for roman numerals? What is 729 divisble by? What are numbers multiplied to equal 720?