Answer:
427.5
Explanation:
(45 x 5) + (45 x 4.5) = 427.5
225 calories
As seen on the graph, where 1 minute passes by, 5 calories are already burned. So, the rate of change is 5. Being that someone is hiking for 45 minutes, you multiply 45 by 5 and get 225... hope this helps :)
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