A railroad crew can lay 5 miles of track each day. They need to lay 140 miles of track. The length, L (in miles), that is left to lay after d days is given by the following function. L(d) =140-5d How many miles of track does the crew have left to lay after 18 days? How many days will it take the crew to lay all the track?

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Asked Sep 22, 2019
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A railroad crew can lay 5 miles of track each day. They need to lay 140 miles of track. The length, L (in miles), that is left to lay after d days is given by the following function. L(d) =140-5d
 
How many miles of track does the crew have left to lay after 18 days? 
How many days will it take the crew to lay all the track? 
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Expert Answer

Step 1

The given function is L(d) = ...

Substitute 18 for d in L(d)
L(d)140-5(18)
-140-90
= 50
Hence, there are 50 miles of track does the crew have left to after 18 days.
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Substitute 18 for d in L(d) L(d)140-5(18) -140-90 = 50 Hence, there are 50 miles of track does the crew have left to after 18 days.

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