The maximum number of months the computer could be kept so that it is cheaper to rent than to buy is 10 months.
The first step is to determine the month in which the two options would have the same cost. The equation that can be used to determine this value is:
$1890 = $900 + 90t
90t = 1890 - 900
90t = 990
t = 990 / 90
t = 11 months
The maximum number of months = 11 months - 1 = 10 months
To learn more about division, please check: https://brainly.com/question/194007
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