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Problem 1 Hard Difficulty

John runs at different speeds as part of his training
program. The graph shows his target heart rate at
different times during his workout. On which
interval is the target heart rate strictly increasing then
strictly decreasing?
A) Between 0 and 30 minutes
B) Between 40 and 60 minutes
C) Between 50 and 65 minutes
D) Between 70 and 90 minutes

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SR

Samantha R.

July 1, 2020

SR

Samantha R.

July 1, 2020

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Video Transcript

so if we want to know when it's strictly increasing than strictly decreasing, then we have to find when the graph goes up and then goes down it because it's a strictly increasing, strictly decreasing. We don't want, like a lab period where there's like nothing going on. We don't want this and this and like and then this is a minute that was Overall, this graph is also increasing and decreasing. With this middle part. There's like a little bit of a laugh. So if we want to find when it goes up and down, well, that looks like this period right here and that is between forty and sixty minutes. So we're going to choose B.