Substituting Numbers for Letters

Substituting Numbers for Letters

Locomotives

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Locomotives

This Burlington Northern and Santa Fe (BNSF) Railway locomotive is about 70 feet long.

  • Write an expression to describe the length of 3 locomotives in a row, where a represents the length of 1 locomotive.
  • Evaluate your expression for a = 70.

Hint:

To evaluate your expression for a = 70, you need to replace any occurrence ofa in your expression with the value 70

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