16 + 0.03n, where n is the A phone company charges for service according to the formula: C(n)
number of minutes talked, and C(n) is the monthly charge, in dollars.
Minutes
The rate of change in this equation is:
Dollars
The initial value in this equation is:

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)