At a coin collector's shop, a rare us coin was recently marked up 50% and is now selling for $210.00. how much was the coin before the mark-up?

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?

The weight of a full steel bead tire is approximately 800 grams, while a fighter wheel weighs only 700 grams. what is the weight of each tire in pounds?

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81