What is X12N?

Write 12.76 million in scientific notation? What are three CDE's? How acres in 409 square miles? What number can go into 900? How can calculated plimsoll line? What are all the numbers less than 100 and products of 3 prime numbers? What is a horizotal axis called? What is the largest diget? What are the different modes of extinguishing an obligation? How do you write 0624 in Roman numerals? Does a rhombus have two pairs of equal angles? What is the name of the tessellation made with more than one regular polygon? What are the 2 ways of common external tangent from common internal tangent? How do you write 2 and four eighths in simplest form? -1 3 y plus 3 -y 15? Who does Dora looks like? What is the name for all the vertical and horizontal lines found on a globe? Is 631 prime or composite? What shape will form a tessellation? Why do zeros written at the end of a decimal change the way that the decimal is read but do not change its value?