What set does 38 belong to?

Should the numbers referring to algebra 1 and 2 be Arabic numbers or roman numerals? Which is the equation of the line with the slope 3 that contains point negative 1 and positive 5? What is whole ones of 15 fifth? What is the area of trapezium whose parallel sides are 60 cm and 77 cm and non parallel sides are 25 cm and 26 cm? What is 81 percent of 420? Who discovered pi is irrational no? What does a function rule look like? How is sample is termed if it has similar characteristics to the population being studied.? What times 15 plus 30 180? What is the longest factor string of 270? What is non-linear reading? Write 0.000513 in scientific notation? The age of the father 6 years ago is four times then the age of his son The age of the father 4 years hence is double the then age of his son? How many square foot in 48 x 132 inches? In Roman Numerals what is twelve? What is a genius? What would the internal angle of an equilateral triangle? How much weight is 115 milligrams? What are the behaviors or thoughts that are repeated frequently that require less and less processing capacity because of? What do you use in place of brasso?