d(x)=1375-110x
In this function d is the distance that a train is from its destination after traveling x hours. To determine the distance after 8 hours, we substitute 8 in the function and evaluate.
After traveling for 8 hours, the train will be 495 miles from its destination.
b To find when the train arrives at its destination, we need to find the value of x for which d(x) will equal 0 because the train will be 0 miles from the destination. To determine the number of hours it takes for the train to reach its destination, we simply substitute d(x)= 0 into the function and solve for x.
