Question 41463
This problem involves a linear equation.  The telephone bill increases with the number of minutes used in a linear fashion.

The format is y = mx + b

y = the total bill
m = the cost per minute 
x = the number of minutes
b = the flat rate

Putting it all together:
10.69 = .07x + 4.95

Solving for x:

10.69 - 4.95 = .07x
5.74 = .07x
5.74/.07 = .07x/.07
x = 82 minutes
Check you answer by plugging 82 minutes back into the equation.