Asports team has won 21 out of the 40 games it has played. about what percent of the games has the team won?

They won 21 games out of 40.
so, 
from 40 games they won 21 gamesFrom 1 game they won 21/40 gamesfrom 100 games they won =  21*100/40 games                                         
  = 52.5 percent (ans.)

The slope of the function is 0.5.