8:40 WS 10-12.docx 3. A frog is at the bottom of a 21-foot well. Each time the frog leaps, it moves up 3 feet. If the frog has not reached the top of the well, then the frog slides back 1 foot before...

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Extracted text: 8:40 WS 10-12.docx 3. A frog is at the bottom of a 21-foot well. Each time the frog leaps, it moves up 3 feet. If the frog has not reached the top of the well, then the frog slides back 1 foot before it is ready to make another leap. How many leaps will the frog need to escape the well? Understand the problem Devise a plan Carry out the plan Look back