What does addenda mean in math?

Why does a hollow cube float? How do you draw the fraction to show four ninths? What is 0.000458 in scientific notation? How many years are in 8 millennia? What is the size of land square that is point 3 1 acres? Four friends share half of a pie equally.what fraction of pie does each get? What algoritms will produce the correct result for the sum a b where a anda b each represent any rational number? Three fifths add one fifthteenth equals? Is this statement true or falseVertical angles do not share a vertex.? What is 9 more than the product of 4 and the number is 73? What is tenth of 11? A type of variation in the form y equals kx? How much is a double-stamped 1964 penny from the Denver mint worth? What is 5-9 using a number line? What is the GFC of 14 and 42? What is 821 in roman numerals? What is shape is this when both sides are exactly the same? Kent works in housewares this year he set a record high for vacuum sales of 567 sold the previous high was last year 540 what is the percent of increase in sales from last year to this year? If the CPI for Entertainment in 1970 was 113.4 and 200.6 in 1980 find the inflation rate for Entertainment between 1970 and 1080 Round your answer to the nearest percent? What is 949 rounded to the nearest ten and hundred?