What measures a centimeter?

What are the values of t and v when y plus 4x equals 11 is the perpendicular bisector of the line joining t 2 and 6 v? If the equation of variation where y varies directly as x One pair of values is y equals 80 when x equals 40? What is 2 3rds plus 3 4ths? What is 126 divided by10 then written as a fraction? What is 4cm in a fraction? How do you get the scientific notation of 0.70010? What is 75 percent of 400 dollars? Do quadratic equations have exponents? When does positive externality exist? Examples of ways to reduce population? How many bricks do i need to build a brick wall 25ft long 3ft high? When did Romans make Roman Numerals? Is the number 567 even or odd? What is the percent of discount of 14 to 3.89? How many times does 2000 go into 5000? Why do stores use math? What is 13 divided by 25 as a decimal? Is there a 2 and a half cent US coin? How mathematics helps you? 25 cft into feet?