Answer:
The expression for the total cost of the visit to dentist is T = 50 + 100n . 
 
Explanation:
As given 
 
The price of a visit to the dentist is $50. 
 
If the dentist fills any cavities, an additional charge of $100 per cavity gets added to the bill. 
 
If the dentist n cavities . 
 
Let us assume that the total cost of the visit to dentist be T. 
 
Than the expression becomes 
 
T = 50 + 100n 
 
Therefore the expression for the total cost of the visit to dentist is T = 50 + 100n .