How many microns is a virus?

Solve 4x plus 5x equals 60? What are the four main operations of an information sysytem? Is an apple made of 25 percent air that is why they float? Did Albert Einstein have a famous quote? What is roman number XLII? Which has the greatest area a circle with a radius of 4 cm or a semi-circle with a diameter of 11 cm? How do you work out the acceleration? What is 23.4 as a mixed number? What does the equation y equals x2 - 12x plus 2 become after completing the square? 5n plus 15 equals 25 solve for n? Who is an intelligent person? What are all of the factors for the number 21? Is the set of prime numbers are well-defined or not why? What does 168 square feet equal? Calculate the circumference of a circle with each diameter? Is 1.06 the halfway between 1.6 and 1.7 how do you know? What are estimated assets? What is 1.375 equal to in fraction? What is the abbreviation for the International Systems of Measurement? What is the improper fraction of one and one half and one and two thirds?