Determine whether the function represents exponential growth or exponential decay and identity the percent rate of change.
Determine si la función representa un crecimiento exponencial o una disminución exponencial e
identifique la tasa de cambio porcentual.

PLEASE SHOW WORK

f(t) = 32.1(0.96)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling