In speech class,you lose 3 points for every 30 seconds you go over the time limit. Your speech is 90 seconds over the time limit. What integer represents the change in your points?
-9; it's a negative number because you're losing points. You than want to find how many groups of 30 are in 90, which is 3. You lose 3 points 3 times, which makes a total of 9 points lost.
