Which conditions best describe a zone that is the appropriate size?
A lifeguard can see everyone who is on the surface.
A lifeguard can scan the entire zone in 20 seconds and can scan to the farthest point in 10 seconds.
A lifeguard can count the number of people in the zone.
A lifeguard can scan the entire zone in 10 seconds and can get to the farthest point in 20 seconds.
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Which conditions best describe a zone that is the appropriate size?
A lifeguard can see everyone wh...
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