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20 September, 07:18

Anna does sit-ups to get ready for her first triathlon. When she starts, she does a sit-up every 2 seconds. But, as she gets tired, each sit-up takes longer and longer to do. Is the number sit-ups Anna does proportional to the time she spends doing them?

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  1. 20 September, 09:19
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    Yes it is. Think about it like exponential chart. The more time she does sit-ups, the more it takes to do one sit-up, due to lack of energy.
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