Answer:
I believe the answer will be 50+100n dollars
Step-by-step explanation:
<em>n </em>is the number of cavities so however many cavities there is, it gets multiplied by 100, in this case, it is 100*n which is 100n. So your final cost would be 50+100n dollars.
she spent 1.98 ..............
$7.93
20 - 12.07 = 7.93