What are the results when you flip the numerator and denominator of a fraction?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

The table shows the results of three plays in a football game. what is the net result of the three plays? football game 1st play 5 yards 2nd play -9 yards 3rd play 12 yards

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?