Answer:
$3.63
Explanation:
A 10-minute call to France cost $3.19.

A 15-minute call to France costs $4.29.

Now we will use two point slope form

Substitute the values :





y is the cost and x is the number of minutes
Now we are suppose to find cost of a 12-minute call to France
Substitute x = 12


Hence the cost of a 12-minute call to France is $3.63