Whats the place value relationship when the same two digits are next to eachother in a multi digit number

The circumference of a circle is 5 pi cm. what is the area of the circle?

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?

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost