Answer:
Points required to win the trophy =500
Points Kristen already scored = 418
Let Kristen require x points to win the trophy.
So making an equation using the information we have,
418+x=500
Now we have to solve this equation to get the value of x .
subtracting 418 from 500 , we have,
x=500-418
x=82
So Kristen require at least 82 points to win the trophy.