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What happens to the value of the expression 80-2r as r decreases? Choose 1 answer: A It increases. (B) It decreases. (C) It stays the same.

What happens to the value of the expression 80−2r 80-2 r as r r decreases?\newlineChoose 11 answer:\newline(A) It increases.\newline(B) It decreases.\newline(C) It stays the same.

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Full solution

Q. What happens to the value of the expression 80−2r 80-2 r as r r decreases?\newlineChoose 11 answer:\newline(A) It increases.\newline(B) It decreases.\newline(C) It stays the same.
  1. Identify relationship between r and expression: Identify the relationship between r and the expression 8080−2-2r.\newlineAs r decreases, the value of 22r also decreases because it is directly proportional to r.
  2. Determine effect of decrease in 2r2r on expression: Determine the effect of a decrease in 2r2r on the expression 80−2r80-2r.\newlineIf 2r2r decreases, then subtracting a smaller number from 8080 results in a larger number. Therefore, the expression 80−2r80-2r increases as rr decreases.
  3. Choose correct answer based on relationship: Choose the correct answer based on the relationship identified.\newlineSince the expression 80−2r80-2r increases as rr decreases, the correct answer is A) It increases.

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