What is about 200 years old?

How many 60 inch round tables can fit into a room that is 1500 square foot room? Are 5 and 29 prime number? How do you write 1.379 Billion in figures? What is a cc exclusion? Factorise a a plus 10a plus 24? Write 56.2 percent as a decimal? Is X plus 14 a polynomial? What is 100 minus one minus two minus three minus four minus five minus six minus seven minus eight minus nine minus nine minus eight? Why short time Fourier transform is necessary? What year is MCML? Why do you use a Greek letter to represent pi? Can you get 2 loans on 1 car? How do you do the area if both sides of a square are the same? What place is the 8 in 908? Does 2 times larger mean a number multiplied by itself or multiplied by 2? What is 20 percent of 780? What is the SPDF Notation for Mn2 plus? What exactly is the corpora cavernosa? What is the radius of a star? What is 150 millions in scientific notation?