www- O GRAPHS AND FUNCTIONS Hannah Finding inputs and outputs of a two-step function that models a.. Espanol A railroad crew can lay 5 miles of track each day. They need to lay 145 miles of track. The length, L (in miles), that is left to lay after d days is given by the following function. L(d) = 145-5d Answer the following questions. (a) How many miles of track does the crew have left to lay after 17 days? D 1) miles (b) How many days will it take the crew to lay all the track? days X 5