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Imagine a wizard who converts the number of blueberries given to her by multiplying them by 2 then adding 9. After she performs her magic on the 'input' (the blueberries she is given), she returns the 'output' (the new number of berries). What expression would represent this process? Below are a few possibilities. Which two correctly describe the rule "multiply by two, then add 9"?

1 Answer

5 votes

Answer:

2b + 2

Explanation:

Let b = number of blueberries at the beginning

multiply by 2: 2b

add 9: 2b + 9

Answer: 2b + 9

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