What is the initial value for the equation: y = (0.85)^x

In trapezoid bath, ah=19.7 and et=16.1. identify be.

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

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !