What is a dectogon?

What is 130 plus 30 plus 60 plus 80? Example of bicameral? What is 3750 divided by 50? The differnce between the product of four and a number and 6? How much 75 kilos into decimal points? How do you say 3 120 048 in words? How do you rewrite an expression in simplest form? What is 60 divided by 300? How do you calculate crude death rate? What is the turning point of a graph called? Is 27a composite number? What is half of seven hundred? What does xenic mean? How do you lose 16 pounds in a month? How much is usd 100 in pounds? A high speed train travels south for 2.00 h for a distance f 454 km What is its average velocity? What is a 3 D octagon called? How many feet is 60 in? Range of signed numbers that can be stored in an 8 bit register? Introduction of surface area and volume?