Tonya and Leo each bought a cell phone at the same time. The trade-in values, in dollars, of the cell phones are modeled by the given functions, where x is the number of months that each person has owned the phone.

Tonya’s Phone Leo’s Phone
f(x) =490(0.88)x
x g(x)
0 480
2 360
4 270

phone has the greater initial trade-in value.

During the first four months, the trade-in value of Tonya’s phone decreases at an average rate
the trade-in value of Leo’s phone.