Question

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Part 1
Martin walked t terriers and r retrievers on Monday. He walked the same number of terriers and retrievers each day Tuesday through Friday. Write an algebraic expression to represent how many total dogs were walked in this 5​-day period.
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Part 1
An algebraic expression for the total number of dogs is
  
enter your response here.
​(Use the operation symbols in the math palette as​ needed.)
An algebraic expression for the total number of dogs is(Use the operation symbols in the math palette as needed.)
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Answer 1

5(t + r) which is equivalent to 5t + 5r.

(Reason: Monday he walked t + r dogs, and the same number each of the other 4 days, so total = 5×(t + r).)