We are given the function:
d (x) = 1375 – 110 x
A. To solve for the distance between the train and its
destination after 8 hours, we simply have to plug in, x = 8 into the equation. That
is:
d (x) = 1375 – 110 * 8
d (x) = 495 miles
Therefore the train is now only 495 miles away from the destination.
B. To solve for the total time needed to reach its
destination, we must set d = 0 and find for the value of x:
0 = 1375 – 110 x
110 x = 1375
x = 12.5 hours
Therefore it takes 12.5 hours for the train to reach its
destination.
