Arelation of the graphed below is not considered a function because of which pair of coordinates:

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

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Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with