Write a whole number that round to 800 if we rounding to nearest ten thousand

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

18 16 11 45 33 11 33 14 18 11 what is the mode for this data set