What is the recursive formula for the following sequence? 3,9,27,81

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Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.