Question: Derek is building a learning tower. A learning tower allows small children to help in the kitchen safely. For this project, Derek needs 13 pieces

Derek is building a "learning tower". A learning tower allows small children to help in the kitchen safely. For this project, Derek needs 13 pieces of lumber. Unfortunately, Derek knows that there is an 11% chance that a piece of lumber is unusable due to being warbed, split, or having too many knots. To account for potentially unusable lumber, Derek purchases 16 pieces of lumber. Derek is hoping to be able complete the project with only one trip to the Home Improvement store. How many boards would you recommend that Derek purchase? Use appropriate mathematics to support your

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