What number is the height changing by each minute

The height is changing by 0.5 each minute
The question implies that we calculate the slope of the table
From the table of values, we have the following points
(0, 150) and (1, 150.5)
The slope is then calculated as:
m = (y2 - y1)/(x2 -x1)
This gives
m = (150.5 - 150)/(1 - 0)
Evaluate
m = 0.5
Hence, the height is changing by 0.5 each minute
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