All that's easy.The anwer to an additional prolem is a SUM
The sum
this is an additional problem
The answer in a subtraction problem is difference.
A product is an answer to a multiplication problem.
you call it a product
Problem analysis.
the answer
It all depends on what your residential phone line has for a plan. If it is unlimited local and long distance, you should have no problem making this call and should not incur an additional charge if the call is within the United States. The Verizon phone will lose it's monthly minutes unless it is on an unlimited call plan.
The answer to a substraction problem is called a difference
Your face was biggest problem .
A quotient
Difference