Question: A store manager has determined that the monthly profit y realized from selling a particular brand of car battery is given by y = l0x

A store manager has determined that the monthly profit y realized from selling a particular brand of car battery is given by
y = l0x - 155
where x denotes the number of these batteries sold in a month.
(a) If 41 batteries were sold in a month, what was the profit?
(b) At least how many batteries must be sold in a month in order to make a profit?

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