Answered

Mr. Smith and Mr. Stein were driving to a business meeting 140 miles from their office. Mr. Smith drove the first
r
r miles, then Mr. Stein drove the rest of the way.

Write an algebraic expression for how many miles Mr. Stein drove.

Answer :

let us say, for example, the total distance was X miles.
Mr Smith drove the first r miles
therefore Mr Stein drove the remaining which is (X-r)
Hope this gives you a clue

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